1

U.S. Department of the Interior

U.S. Geological Survey

Shear Wave Velocity Of The Ground Near Southern California TRINET Sites Using

The Spectral Analysis Of Surface Waves Method (SASW) And Parallel-Arrayed

Harmonic-Wave Sources

Robert Kayen1, Brad Carkin1, Diane Minasian1 and John Tinsley2

1

Coastal and Marine Geology Program

2

Earthquake Hazards Program

Menlo Park, CA 94025

OPEN-FILE REPORT 2005-1365

 U.S. GEOLOGICAL SURVEY, MENLO PARK, CA 94025
2

Shear Wave Velocity of the Ground Near Southern California TRINET Sites Using

the Spectral Analysis of Surface Waves Method (SASW) and Parallel-Arrayed

Harmonic-Wave Sources

Robert Kayen1, Brad Carkin1, Diane Minasian1 and John Tinsley2

United States Geological Survey

1

Coastal and Marine Geology Program

2

Earthquake Hazards Program

Menlo Park, CA 94025

INTRODUCTION

The seismic network for Southern California administered through the TRINET

project (the name implies the synthesis of three networks) is a collaborative effort of the

administers of the US Geological Survey Southern California Seismic Network (SCSN),

California Institute of Technology network, and California Geological Survey network

(CSMIP). Many of these sites have little or no quantitative characterization for site

amplification effects or natural period characterization. In this study, we investigate

thirteen TRINET sites using an active-source approach that employs ultra-low frequencycontrolled harmonic waves to measure the dispersive nature of surface waves in the

ground. We use a new spectral analysis of surface waves (SASW) approach by arraying

multiple harmonic wave sources that are driven in-phase to excite the ground. An

inversion algorithm employing a non-linear least-squares best fit is used to invert shear

wave velocities for the upper 40-to-100 meters of the soil column.

FIELD METHODS

Spectral analysis of surface waves (SASW) testing is an inexpensive and efficient

means for non-invasively estimating the stiffness properties of the ground. Various

active and passive source surface wave methods have been developed to profile the

subsurface from tens-of-meters to kilometers in depth. Prior to the development of noninvasive surface wave methods, shear-waves were measured in cased boreholes or during

standard or cone penetration tests, both relatively costly methods, using a conventional

travel-time approach. Static cone penetration tests often cannot sound to useful depths

for site response characterization as the soil stiffness mobilizes to resists the maximum

static shear the truck can deliver at shallow depths (<30m) for all but the softest sites.

Surface wave test apparatus is highly portable, allowing for measurements in extremely

remote locations, at soft sites where vehicles cannot drive, and in sub-aqueous

environments (Stokoe and Nazarian, 1985).

We use a surface wave testing system to collect dispersion data with a crew of 2 or 3

people. The test apparatus consists of 1-Hz Kinemetrics1 seismometers, a low frequency

spectrum analyzer, a computer-controlled continuous harmonic-wave source (shaker) and

amplifier, cables and a small 4.5kW generator. The shaker-source is centered in the

SASW seismometer line and receives an oscillatory-signal from a sine function
3

generator. The output signal from the sine wave source is boosted by an amplifier to

produce a continuous harmonic-wave that shakes the ground with surface waves of a

specific frequency. The receivers measure the waves and a fast Fourier transform (FFT)

is performed on each of the four receiver signals. The test steps through a suite of

frequencies for which phase computations, respectively are made. In near-real time, the

linear spectra, cross power spectra, and coherence are computed. The ability to perform

near real-time frequency domain calculations and monitor the progress and quality of the

test allows us to adjust various aspects of the test to optimize the capture of the phase

data while on-site in the field. These aspects include the source-wave generation,

frequency step-size between each sine-wave burst, number of cycles-per-frequency, total

frequency range of all the steps, and receiver spacing. This method of swept-sine surface

wave testing will sweep through a broad range of low frequencies in order to capture the

surface wave-dispersion characteristics of the ground. This approach is a slight

modification of the Continuous Sine wave Source Spectral Analysis of Surface Waves

(CSS-SASW) test presented by Kayen and others (2004a; 2004b).

We use a common source-midpoint geometry in our array set up (Figure 1). To do

this, we place multiple harmonic-sources at the centerline of the survey with the forward

and reverse direction sensor-pairs equidistant from the source for each given array

spacing. This configuration allows us to merge the forward and reverse direction

dispersion curves if they were similar. In order to build a merged dispersion profile for

the site, several different receiver spacings are used to capture the high-, medium-, and

low-frequency ranges of the surface wave dispersion. Spacing of the receivers step

geometrically from 1 meter to 64 meters, i.e. 1, 2, 4, 8, 16, 32, and 64 meters. The two

seismometers are separated by a given distance, d, and the source is usually placed at a

distance of 2d from the inner seismometer. When the array separation increases to a

point where the d:2d spacing became impractical, either due to space limitations, cable

limits, or the attenuation, the array spacing is changed to d:d. Prior investigations have

shown that array spacing ratios between d:d and d:2d are a good compromise for

minimizing near field effects and distant-wave attenuation (Sanchez-Salinero, et al.

1987).

Rayleigh wave wavelengths (λ) are computed by relating the seismometer spacing (δ)

and the phase angle (θ, in radians determined from the cross-power spectra) between the

seismometers:

λ = 2πδ/θ .............................................................................................................(1)

The Rayleigh wave surface wave velocity, Vr, is computed as the product of the

frequency and its associated wavelength:

Vr = ƒλ................................................................................................................(2)

The grouped and average dispersion curves for the TRINET sites are presented in the

Appendix.
4

Figure 1. Configuration of the USGS surface wave testing system, composed of 1-Hz

sensors and two-100 kg electro-mechanical shakers. The shaker apparatus are arrayed in

a parallel circuit to allow for synchronized in-phase frequency controlled swept-sine

analysis. Array separation changes from d:2d to d:d as forward and reverse sensors are

configured for large array separations.

The inversion process is used to estimate the soil stiffness model whose computed

theoretical-dispersion curve is a best-fit with the experimental dispersion data collected in

the field. That is, we invert shear wave velocity profiles using an inversion code that

hunts for the best-fit shear wave velocity profile whose theoretical dispersion curve is the

closest match with the averaged field dispersion curve. The term “best-fit” refers to the

minimum sum of the squares of residuals from the differences between the theoretical

and experimental dispersion curves. The Poisson ratio used in the inversions is 0.33

above the water table and 0.48 below the water table. The water table depth was

estimated by observing the water depth of local creek beds, and the local knowledge of

the fourth author. The inversion algorithm, WaveEq of OYO Corp. (Hayashi and Kayen,

2003) uses an automated-numerical approach that employs a constrained least-squares fit

of the theoretical and experimental dispersion curves. We also ran an independent

inversion algorithm, inverse.m (Lai and Rix, 1998), to validate the profiles computed

from WaveEQ.

RESULTS

The testing program investigated thirteen sites in the Los Angeles basin. These

sites are listed alphabetically in Table 1. Typically, these strong motion recording (SMR)
5

sites are located within Southern California Edison sub station facilities; SBC Telephone

network stations; and public park grounds (Hauksson et al., 2001). We located within

these facilities next to the strong motion recording (SMR) station or tested immediately

adjacent to the facility (Figure 2).

TRINET

Site ID

SASW SITE

ID DATE

SMR

STA LAT LON

Vs30

(m/s)

VsMAX

(m/s)

Inversion

Depth

(m)

NEHRP

Vs30

Code

BRE 701BRE 9/17/04 24 33.81127 -117.97935 215 226 40 D

CHN 707CHN 9/20/04 208 33.99965 -117.67734 276 295 40 D

CLT 712CLT 9/21/04 325 34.09338 -117.31172 256 314 50 D

CPP 705CPP 9/19/04 205 34.06065 -117.80795 217 270 50 D

CRN 708CRN 9/20/04 135 33.87525 -117.55939 367 398 40 C

FMP 700FMP 9/17/04 89 33.71337 -118.29436 276 330 50 D

FON 711FON 9/21/04 449 34.09997 -117.43816 405 464 50 C

GSA 706GSA 9/19/04 234 34.13664 -118.12763 325 337 40 D

MLS 709MLS 9/20/04 230 34.00841 -117.56463 296 360 50 D

OLI 704OLI 9/19/04 162 33.94519 -117.92139 328 593 100 D

PDU 710PDU 9/21/04 445 34.11801 -117.63962 424 542 40 C

SRN 703SRN 9/18/04 208 33.82722 -117.78888 261 333 50 D

STG 702STG 9/18/04 49 33.66307 -117.76752 274 406 100 D

Table 1. TRINET stations locations and their corresponding SASW and SMR site

identifier. The computed 30-meter averaged shear wave velocity and NEHRP site codes

are presented in columns 7 and 10. The average velocity for the entire 40-100 meter

profile (see column 9) is presented in column 8. Positions refer to the position of the

shaker sources during the SASW test.

The shear wave velocity structure of the study sites is presented for the uppermost

thirty meters of the ground in the Appendix figures A1-A13 for each of the thirteen SMR

sites. The inversion of a theoretical velocity profile was performed using the inversion

codes Wave-EQ (Hayashi and Kayen, 2003). Typically, a ten layer model was used for

the inversion, with layer thicknesses geometrically expanding with depth. The increasing

layer thicknesses correspond with decreasing dispersion information in the longer

wavelength (deeper) portion of the dispersion curve. The profiles generally increase in

stiffness with depth, though low velocity layers are present in several of the profiles.

The simplest way of characterizing the overall site condition is to use the average

shear wave velocity in the uppermost 30 meters of the subsurface (Vs30; ICC, 2002).

Equation 3 is used to compute the average velocity based on the unit layer thickness (di)

and the corresponding interval-velocity (VSi).
6

€

VS−AVERAGE =

di

i=1

n

∑

di

i=1 VSi

n

∑

(3)

In Table 3 and the Appendix, we report the computed average shear wave velocity

for the upper 30 meters, Vs30, values from the 8-10 layer models. The tested sites fall

within an average velocity range in the upper 30 meters of 215-to-424 m/s. The velocities

all fall within NEHRP categories "C" and "D". To better classify the stiffness of these

units we have informally subdivided the categories with a + or - prefix to indicate

whether the velocity falls within the upper or lower half of the 360 m/s range (e.g. Class

D-; D+, C-; C+ soils).

The maximum depth of the shear wave velocity profile ranged from 40-to-100

meters, and from the entire profile we compute an average velocity, presented in column

8. The ratio between the computed Vs30, and Vs100 values for sites OLI and STG were

1.48 and 1.86 respectively. Ratios for the Vs50 and Vs40 values were lower, ranging

from 1.04 (almost the same value as the Vs30) to 1.28 (nearly the same percent change in

the velocity as the change in the total depth used to compute the average velocity beyond

30 meters, i.e. dMAX/d30). In all cases, the velocity profile and the average velocity

increased in value with depth beyond 30 meters.

Figure 2. Thirteen TRINET sites tested in this study are located in the greater Los

Angeles basin; Santa Ana valley; and Orange county.
7

REFERENCES

Hauksson, E., P. Small, K. Hafner, R. Busby, R. Clayton, J. Goltz, T. Heaton, K.

Hutton, H. Kanamori, J. Polet, D. Given, L. M. Jones, and D. Wald, Southern

California Seismic Network: Caltech/USGS Element of TriNet 1997-2001,

Seism. Res. Lett. 72, 697-711, 2001

Hayashi, K. and Kayen, R. (2003) comparative test of three surface wave methods at

Williams Street Park in San Jose, USA. Paper S051-009, 2003 Joint Meeting of

Japan Earth and Planetary Science , University of Tokyo, Tokyo, Japan 2003

Joint Meeting, May 26-29, 2003.

International Code Council, Inc., 2002. 2003 International Building Code, Falls

Church, VA.

Kayen, R. (2005) The spectral analysis of surface waves measured at William

Street Park, San Jose, California, using swept-sine harmonic waves. In Asten

and Boore, eds., Blind comparisons of shear-wave velocities at closely-spaced

sites in san Jose, California. US Geological Survey Open-File Report 2005-

1169, 6 p. [http://pubs.usgs.gov/of/2005/1169/].

Kayen, R., Seed, R. B., Moss, R.E., Cetin, O., Tanaka, Y., and Tokimatsu, K. (2004)

Global Shear Wave Velocity Database for Probabilistic Assessment of the

Initiation of Seismic-Soil Liquefaction. Proceedings of the 11th Int’l. Conf. On

Soil Dynamics and Earthquake Engineering, January 7-9, 2004, Berkeley, CA,

p. 506-512.

Kayen, R., Thompson, E., Minasian, D., Moss, R.E.S., Collins, B.D., Sitar, N., Dreger,

D., Carver, G. (2004) Geotechnical Reconnaissance of the November 3, 2002

M7.9 Denali Fault Earthquake, Earthquake Spectra, 20(3) p. 639-667.

Lai, C.G., and G. J. Rix (1998) Simultaneous Inversion of Rayleigh Phase Velocity and

Attenuation for Near-Surface Site Characterization," Report No. GITCEE/GEO-98-2, Georgia Institute of Technology, School of Civil and

Environmental Engineering, 258 pp.

Stokoe, K. and Nazarian, S. (1985) Use of Raleigh Waves in liquefaction Studies, in,

R.D. Woods, ed., Measurement and use of Shear Wave Velocity for Evaluating

Dynamic Soil Properties. ASCE, N.Y., 1-17.
8

Appendix A.

Photographs, seismic wave velocity profiles, and data sets for thirteen Southern

California TRINET stations. No photographs were taken at 702STG or 703SRN.
TRINET Site Classification

Site ID 700FMP

NEHRP CLASS: D

Vs30 276 (m/s)

SUB-CLASS D+

Vs50 330 (m/s)

Location Fort MacArthur Park

SMR Station 89

State CALIFORNIA 

POSITION DEGREES

GPS LAT (NORTH) 33.71337

GPS LONG (WEST 118.29436

Data Type SWEPT-SINE SASW

Investigators KAYEN, CARKIN, TINSLEY

Date collected 9/17/2004 (B) Combined Field-Dispersion Curves

TEST METHOD CONTINUOUS HARMONIC WAVE-SASW

PROJECT NAME TRINET

SPONSORS EHZ-SCEC

SITE SUB CLASS: Vs30 (m/s)

A >1500 m/s

B+ 1080 < Vs30 ≤ 1500 m/s

B- 720 < Vs30 ≤ 1080 m/s

C+ 540 < Vs30 ≤ 720 m/s

C- 360 < Vs30 ≤ 540 m/s

D+ 270 < Vs30 ≤ 360 m/s

D- 180 < Vs30 ≤ 270 m/s

E <180 m/s

F Special Soil Conditions: Liquefiable soils; quick 

and high sensitivity clays; collapsible cemented soils; 

peats>3m; high (>75) PI soils thicker than 8m; 

soft/medium stiff clays thicker than 36m.

(C) Inversion-based theoretical dispersion curve

(A) Vs 50 meters profile (solid) and Vs30 (dashed) versus averaged field dispersion curve) 

Figure A1.—SASW site classification and location information for site 700FMP. The layered inversion model of shear wave velocity in the upper 30 meters is presented in 

the middle plot. The site dispersion curves are presented in the upper-right plot, and the comparison between the average site dispersion curve and theoretical dispersion 

curve is presented in the lower-left.

0

5

10

15

20

25

30

35

40

45

50

0 360 720

Vs (m/s)

z (m)

700FMP

Vs30

0

50

100

150

200

250

300

350

400

450

500

0 20 40 60 80 100

Frequency (Hz)

Phase Velocity (m/s)

Field Ave. Velocity (m/s)

Inverted Phase Velocity (m/s)
Figure A2.—Site 700FMD (SMR STA 89), located at Fort MacArthur Park, San Pedro, Los Angeles County, California. Site location 33.71337°N 

 118.29436°W. Photo views: A) Looking south, B) looking southwest towards the park summit, C) looking north towards San Pedro, and D) looking 

 west towards Palos Verdes.

A

C

B

D
700FMP DISPERSION DATA INVERSION PROFILE

Site Disp. Vr (m/s) Theoretical Disp. Vr (m/s) Frequency (Hz) Inversion Vs (m/s) Depth (m)

482.0 4.3 136.8 0.0

481.0 380.0 4.3 136.8 3.4

383.0 344.0 6.3 278.4 3.4

347.4 315.4 9.8 278.4 7.2

311.9 294.7 13.2 285.1 7.2

300.1 275.5 16.7 285.1 11.6

280.6 256.0 20.1 324.1 11.6

265.0 225.6 23.8 324.1 16.6

215.6 185.6 27.4 322.3 16.6

203.5 149.9 30.9 322.3 22.2

179.2 131.9 34.2 343.3 22.2

147.2 120.9 37.5 343.3 28.4

115.0 116.8 41.9 405.8 28.4

119.1 113.9 45.1 405.8 35.3

115.9 112.2 48.8 498.3 35.3

120.8 110.9 52.2 498.3 50.0

120.6 110.0 55.8

121.1 109.4 59.3

114.9 108.9 62.8

113.8 108.6 66.4

110.8 108.3 69.8

107.3 108.1 73.4

Vs30 275.6

Figure A3.—Surface wave dispersion curve and shear wave velocity inversion data for site 700FMP.
TRINET Site Classification

Site ID 701BRE

NEHRP CLASS: D

Vs30 215 (m/s)

SUB-CLASS DVs40 226 (m/s)

Location Barre Substation, Stanton

SMR Station 24

State CALIFORNIA 

POSITION DEGREES

GPS LAT (NORTH) 33.80776

GPS LONG (WEST 117.98116

(Merged Field-Dispersion Curves)

Data Type SWEPT-SINE SASW

Investigators KAYEN, CARKIN, TINSLEY

Date collected 9/17/2004

(B) Combined Field-Dispersion Curves

TEST METHOD CONTINUOUS HARMONIC WAVE-SASW

PROJECT NAME TRINET

SPONSORS EHZ-SCEC

SITE SUB CLASS: Vs30 (m/s)

A >1500 m/s

B+ 1080 < Vs30 ≤ 1500 m/s

B- 720 < Vs30 ≤ 1080 m/s

C+ 540 < Vs30 ≤ 720 m/s

C- 360 < Vs30 ≤ 540 m/s

D+ 270 < Vs30 ≤ 360 m/s

D- 180 < Vs30 ≤ 270 m/s

E <180 m/s

F Special Soil Conditions: Liquefiable soils; quick 

and high sensitivity clays; collapsible cemented soils; 

peats>3m; high (>75) PI soils thicker than 8m; 

soft/medium stiff clays thicker than 36m.

(C) Inversion-based theoretical dispersion curve

(A) Vs 40 meters profile (solid) and Vs30 (dashed) versus averaged field dispersion curve)

Figure A4.—SASW site classification and location information for site 701BRE. The layered inversion model of shear wave velocity in the upper 30 meters is presented in 

the middle plot. The site dispersion curves are presented in the upper-right plot, and the comparison between the average site dispersion curve and theoretical dispersion 

curve is presented in the lower-left.

0

5

10

15

20

25

30

35

40

0 360

Vs (m/s)

z (m)

701BRE

Vs30

0

50

100

150

200

250

300

0 20 40 60 80

Frequency (Hz)

Phase Velocity (m/s)

Field Ave. Velocity (m/s)

Inverted Phase Velocity (m/s)
Figure A5.—Site 701BRE (SMR STA 24), located at Barre Substation, Stanton, Orange County, California. Site location 33.81127°N 117.97935°W. 

 Photo views: A) Looking northwest into Hollenbeck Park, B) looking southeast towards Cerritos Ave., C) looking north into Hollenbeck Park, and 

 D) looking south towards Cerritios Ave and BRE substation.

A

C

B

D
701BRE DISPERSION DATA INVERSION PROFILE

Site Disp. Vr (m/s) Theoretical Disp. Vr (m/s) Frequency (Hz) Inversion Vs (m/s) Depth (m)

276.0 4.5 163.7 0.0

238.2 228.5 6.0 163.7 1.7

210.0 206.1 8.1 173.2 1.7

194.6 191.6 10.2 173.2 3.5

188.4 182.6 12.7 150.0 3.5

184.2 178.8 14.9 150.0 5.6

180.4 177.3 17.3 186.7 5.6

181.5 177.0 19.5 186.7 8.0

185.2 177.2 21.9 208.9 8.0

185.2 177.7 24.2 208.9 10.7

185.2 178.3 26.5 215.6 10.7

183.7 178.7 28.7 215.6 13.7

185.1 179.1 31.1 226.9 13.7

183.6 179.4 33.5 226.9 17.0

187.1 179.4 35.7 240.3 17.0

187.3 179.2 38.1 240.3 20.6

186.2 178.7 40.4 252.9 20.6

187.7 177.9 42.7 252.9 24.5

187.0 176.8 45.0 269.7 24.5

186.1 175.5 47.2 269.7 30.0

186.1 173.9 49.4 269.7 40.0

183.5 171.8 52.0

183.5 170.1 54.3

183.5 168.5 56.6

183.5 167.0 58.8

Vs30 214.8

Figure A6.— Surface wave dispersion curve and shear wave velocity inversion data for site 701BRE.
TRINET Site Classification

Site ID 702STG

NEHRP CLASS: D

Vs30 274 (m/s)

SUB-CLASS D+

Vs100 406 (m/s)

Location Santiago

SMR Station 49

State CALIFORNIA 

POSITION DEGREES

GPS LAT (NORTH) 33.66307

GPS LONG (WEST 117.76752

Data Type SWEPT-SINE SASW

Investigators KAYEN, CARKIN, TINSLEY

Date collected 9/18/2004

(B) Combined Field-Dispersion Curves

TEST METHOD CONTINUOUS HARMONIC WAVE-SASW

PROJECT NAME TRINET

SPONSORS EHZ-SCEC

SITE SUB CLASS: Vs30 (m/s)

A >1500 m/s

B+ 1080 < Vs30 ≤ 1500 m/s

B- 720 < Vs30 ≤ 1080 m/s

C+ 540 < Vs30 ≤ 720 m/s

C- 360 < Vs30 ≤ 540 m/s

D+ 270 < Vs30 ≤ 360 m/s

D- 180 < Vs30 ≤ 270 m/s

E <180 m/s

F Special Soil Conditions: Liquefiable soils; quick 

and high sensitivity clays; collapsible cemented soils; 

peats>3m; high (>75) PI soils thicker than 8m; 

soft/medium stiff clays thicker than 36m.

(C) Inversion-based theoretical dispersion curve

(A) Vs 100 meters profile (solid) and Vs30 (dashed) versus averaged field dispersion curve)

Figure A7.—SASW site classification and location information for site 702STG. The layered inversion model of shear wave velocity in the upper 30 meters is presented in 

the middle plot. The site dispersion curves are presented in the upper-right plot, and the comparison between the average site dispersion curve and theoretical dispersion 

curve is presented in the lower-left.

0

5

10

15

20

25

30

35

40

45

50

55

60

65

70

75

80

85

90

95

100

0 360 720

Vs (m/s)

z (m)

702STG

Vs30

0

100

200

300

400

500

600

700

0 20 40 60

Frequency (Hz)

Phase Velocity (m/s)

Field Ave. Velocity (m/s)

Inverted Phase Velocity (m/s)
Figure A8.—Site 702STG (SMR STA 49), is located at a work site on the corner of Barranca Parkway and Laguna Canyon Road in Irvine, Orange 

 County, California. The site location is at 33.82722°N 117.78888°W. Photo is an aerial photo view of the site. (Map from http://maps.google.com).
702STG DISPERSION DATA INVERSION PROFILE

Site Disp. Vr (m/s) Theoretical Disp. Vr (m/s) Frequency (Hz) Inversion Vs (m/s) Depth (m)

607.0 3.1 145.9 0.0

607.0 550.0 3.1 145.9 4.6

369.3 361.6 5.2 266.0 4.6

356.5 344.8 7.6 266.0 9.6

317.3 300.7 9.7 335.3 9.6

244.4 247.4 12.2 335.3 15.4

232.7 222.0 14.6 348.0 15.4

218.8 207.7 16.8 348.0 22.1

206.7 194.3 19.1 347.7 22.1

175.1 179.8 21.5 347.7 29.6

174.6 166.4 23.7 356.8 29.6

152.2 154.6 26.1 356.8 37.9

149.4 146.3 28.4 445.1 37.9

140.3 140.3 30.7 445.1 47.1

136.7 135.4 33.0 512.9 47.1

134.8 131.7 35.4 512.9 57.1

134.4 128.8 37.7 554.3 57.1

133.6 126.7 39.9 554.3 67.9

128.0 124.8 42.3 583.3 67.9

122.3 123.3 44.6 583.3 100.0

119.7 122.1 47.0 583.3 100.0

Vs30 274.0

Figure A9.— Surface wave dispersion curve and shear wave velocity inversion data for site 702STG.
TRINET Site Classification

Site ID 703SRN

NEHRP CLASS: D

Vs30 261 (m/s)

SUB-CLASS DVs50 333 (m/s)

Location Serrano

SMR Station 208

State CALIFORNIA 

POSITION DEGREES

GPS LAT (NORTH) 33.82722

GPS LONG (WEST 117.78888

Data Type SWEPT-SINE SASW

Investigators KAYEN, CARKIN, TINSLEY

Date collected 9/18/2004

(B) Combined Field-Dispersion Curves

TEST METHOD CONTINUOUS HARMONIC WAVE-SASW

PROJECT NAME TRINET

SPONSORS EHZ-SCEC

SITE SUB CLASS: Vs30 (m/s)

A >1500 m/s

B+ 1080 < Vs30 ≤ 1500 m/s

B- 720 < Vs30 ≤ 1080 m/s

C+ 540 < Vs30 ≤ 720 m/s

C- 360 < Vs30 ≤ 540 m/s

D+ 270 < Vs30 ≤ 360 m/s

D- 180 < Vs30 ≤ 270 m/s

E <180 m/s

F Special Soil Conditions: Liquefiable soils; quick 

and high sensitivity clays; collapsible cemented soils; 

peats>3m; high (>75) PI soils thicker than 8m; 

soft/medium stiff clays thicker than 36m.

(C) Inversion-based theoretical dispersion curve

Figure A10.—SASW site classification and location information for site 703SRN. The layered inversion model of shear wave velocity in the upper 30 meters is presented in 

the middle plot. The site dispersion curves are presented in the upper-right plot, and the comparison between the average site dispersion curve and theoretical dispersion 

curve is presented in the lower-left.

(A) Vs 50 meters profile (solid) and Vs30 (dashed) versus averaged field dispersion curve)

0

5

10

15

20

25

30

35

40

45

50

0 360 720

Vs (m/s)

z (m)

703SRN

Vs30

0

50

100

150

200

250

300

350

400

450

0 50 100 150

Frequency (Hz)

Phase Velocity (m/s)

Field Ave. Velocity (m/s)

Inverted Phase Velocity (m/s)
Figure A11.—Site 703SRN (SMR STA 208), located at a substation in Orange, Orange County, California. Site location 33.82722°N 117.78888°W. 

 Photo is an aerial photo view of the site. (Map from http://maps.google.com).
703SRN DISPERSION DATA INVERSION PROFILE

Site Disp. Vr (m/s) Theoretical Disp. Vr (m/s) Frequency (Hz) Inversion Vs (m/s) Depth (m)

471.0 440.0 5.4 144.8 0.0

404.2 397.9 5.9 144.8 2.3

303.3 307.2 8.2 153.8 2.3

274.7 269.0 10.5 153.8 4.8

245.0 249.1 12.7 200.0 4.8

229.1 233.0 15.1 200.0 7.7

222.5 221.5 17.4 232.9 7.7

216.2 213.9 19.6 232.9 11.0

209.9 208.0 22.0 309.1 11.0

209.5 204.1 24.3 309.1 14.8

203.1 200.9 26.6 331.5 14.8

194.5 197.9 28.9 331.5 19.0

191.3 194.7 31.2 339.3 19.0

195.4 190.6 33.6 339.3 23.5

182.4 185.3 35.8 392.2 23.5

170.3 178.9 38.1 392.2 28.5

170.6 172.8 40.2 471.1 28.5

172.9 165.6 42.8 471.1 34.0

172.3 160.3 45.1 553.1 34.0

169.6 156.0 47.3 553.1 39.8

164.2 152.5 49.7 627.6 39.8

159.9 149.7 52.0 627.6 50.0

156.2 147.6 54.3 627.6 50.0

154.1 145.8 56.6

154.3 144.4 58.9

132.9 137.3 95.8

130.0 137.2 98.1

133.4 137.1 100.3

131.6 137.1 102.7

129.6 137.0 105.0

126.4 136.9 107.3

126.5 136.9 109.7

125.4 136.8 111.9 Vs30 260.8

124.2 136.8 114.2

123.1 136.8 116.6

Figure A12.— Surface wave dispersion curve and shear wave velocity inversion data for site 703SRN.
TRINET Site Classification

Site ID 704OLI

NEHRP CLASS: D

Vs30 328 (m/s)

SUB-CLASS D+

Vs100 593 (m/s)

Location Olinda Substation

SMR Station 162

State CALIFORNIA 

POSITION DEGREES

GPS LAT (NORTH) 33.94519

GPS LONG (WEST 117.92139

Data Type SWEPT-SINE SASW

Investigators KAYEN, CARKIN, TINSLEY

Date collected 9/19/2004

(B) Combined Field-Dispersion Curves

TEST METHOD CONTINUOUS HARMONIC WAVE-SASW

PROJECT NAME TRINET

SPONSORS EHZ-SCEC

SITE SUB CLASS: Vs30 (m/s)

A >1500 m/s

B+ 1080 < Vs30 ≤ 1500 m/s

B- 720 < Vs30 ≤ 1080 m/s

C+ 540 < Vs30 ≤ 720 m/s

C- 360 < Vs30 ≤ 540 m/s

D+ 270 < Vs30 ≤ 360 m/s

D- 180 < Vs30 ≤ 270 m/s

E <180 m/s

F Special Soil Conditions: Liquefiable soils; quick 

and high sensitivity clays; collapsible cemented soils; 

peats>3m; high (>75) PI soils thicker than 8m; 

soft/medium stiff clays thicker than 36m.

(C) Inversion-based theoretical dispersion curve

 

Figure A13.—SASW site classification and location information for site 704OLI. The layered inversion model of shear wave velocity in the upper 30 meters is presented in 

the middle plot. The site dispersion curves are presented in the upper-right plot, and the comparison between the average site dispersion curve and theoretical dispersion 

curve is presented in the lower-left.

(A) Vs 100 meters profile (solid) and Vs30 (dashed) versus averaged field dispersion curve)

0

5

10

15

20

25

30

35

40

45

50

55

60

65

70

75

80

85

90

95

100

0 360 720 1080 1440

Vs (m/s)

z (m)

704OLI

Vs30

0

100

200

300

400

500

600

700

0 20 40 60 80

Frequency (Hz)

Phase Velocity (m/s)

Field Ave. Velocity (m/s)

Inverted Phase Velocity (m/s)
Figure A14.—Site 704OLI (SMR STA 162), located at Olinda Substation, La Habra, Orange County, California. Site location 33.94519°N 117.92139°W.

 Photo views: A) Looking north toward OLI Substation B) looking east along the north edge of the Loma Norte park, C) looking north towards OLI 

 Substation, and D) looking west towards OLI.

A

C

B

D
704OLI DISPERSION DATA INVERSION PROFILE

Site Disp. Vr (m/s) Theoretical Disp. Vr (m/s) Frequency (Hz) Inversion Vs (m/s) Depth (m)

882.0 4.3 168.5 0.0

619.3 520.0 5.5 168.5 5.5

334.5 379.4 7.1 202.6 5.5

250.3 265.5 8.6 202.6 11.5

244.4 204.4 10.2 604.0 11.5

235.6 182.3 12.0 604.0 18.5

206.2 174.2 13.6 648.0 18.5

184.3 169.9 15.1 648.0 26.5

166.1 167.1 16.9 668.4 26.5

166.2 165.7 18.6 668.4 35.5

165.4 165.0 20.2 797.8 35.5

162.8 164.8 21.8 797.8 45.5

167.5 164.8 23.5 893.1 45.5

171.5 165.1 25.1 893.1 56.5

173.6 165.5 26.8 918.0 56.5

171.7 165.9 28.5 918.0 68.5

171.7 166.3 30.0 959.8 68.5

170.0 166.8 31.7 959.8 81.5

170.0 167.3 33.4 1055.1 81.5

170.0 167.7 35.1 1055.1 100.0

170.0 168.0 36.8 1055.1 100.0

170.0 168.3 38.4

170.0 168.4 40.0

170.0 168.5 41.7

170.0 168.5 43.3

170.0 168.4 45.0

170.0 168.3 46.6

170.0 168.1 48.3

170.0 167.8 49.9

170.0 167.5 51.6

170.0 167.2 53.2

170.0 166.8 54.9

170.0 166.4 56.5 Vs30 328.1

Figure A15.— Surface wave dispersion curve and shear wave velocity inversion data for site 704OLI.
TRINET Site Classification

Site ID 705CPP

NEHRP CLASS: D

Vs30 217 (m/s)

SUB-CLASS DVs50 270 (m/s)

Location Cal Poly Pomona

SMR Station 205

State CALIFORNIA 

POSITION DEGREES

GPS LAT (NORTH) 34.06065

GPS LONG (WEST 117.80795

Data Type SWEPT-SINE SASW

Investigators KAYEN, CARKIN, TINSLEY

Date collected 9/19/2004

(B) Combined Field-Dispersion Curves

TEST METHOD CONTINUOUS HARMONIC WAVE-SASW

PROJECT NAME TRINET

SPONSORS EHZ-SCEC

SITE SUB CLASS: Vs30 (m/s)

A >1500 m/s

B+ 1080 < Vs30 ≤ 1500 m/s

B- 720 < Vs30 ≤ 1080 m/s

C+ 540 < Vs30 ≤ 720 m/s

C- 360 < Vs30 ≤ 540 m/s

D+ 270 < Vs30 ≤ 360 m/s

D- 180 < Vs30 ≤ 270 m/s

E <180 m/s

F Special Soil Conditions: Liquefiable soils; quick 

and high sensitivity clays; collapsible cemented soils; 

peats>3m; high (>75) PI soils thicker than 8m; 

soft/medium stiff clays thicker than 36m.

(C) Inversion-based theoretical dispersion curve

(A) Vs 50 meters profile (solid) and Vs30 (dashed) versus averaged field dispersion curve) 

Figure A16.—SASW site classification and location information for site 705CPP. The layered inversion model of shear wave velocity in the upper 30 meters is presented in 

the middle plot. The site dispersion curves are presented in the upper-right plot, and the comparison between the average site dispersion curve and theoretical dispersion 

curve is presented in the lower-left.

0

5

10

15

20

25

30

35

40

45

50

0 360 720

Vs (m/s)

z (m)

705CPP

Vs30

0

50

100

150

200

250

300

350

400

450

0 20 40 60 80 100

Frequency (Hz)

Phase Velocity (m/s)

Field Ave. Velocity (m/s)

Inverted Phase Velocity (m/s)
Figure A17.—Site 705CPP (SMR STA 205), located at Cal Poly, Pomona, Los Angeles County, California. Site location 34.06065°N 117.80795°W. Photo 

 views: A) Looking north on Citrus Lane, B) & C) looking south on Citrus Lane, and D) looking west towards the Cal Poly Pomona Agriculture Center.

A

C

B

D
705CPP DISPERSION DATA INVERSION PROFILE

Site Disp. Vr (m/s) Theoretical Disp. Vr (m/s) Frequency (Hz) Inversion Vs (m/s) Depth (m)

407.0 3.6 162.5 0.0

407.0 389.9 3.6 162.5 2.8

250.4 266.6 4.9 166.6 2.8

232.1 228.8 7.0 166.6 5.8

216.1 212.8 9.5 179.2 5.8

204.4 202.5 11.8 179.2 9.3

196.2 196.8 14.1 251.9 9.3

191.6 193.6 16.4 251.9 13.3

196.4 191.3 18.7 255.3 13.3

197.1 189.2 21.0 255.3 17.8

192.4 186.1 23.4 226.8 17.8

180.1 182.5 25.6 226.8 22.8

177.7 177.8 28.1 244.3 22.8

174.4 173.5 30.3 244.3 28.3

176.4 169.6 32.7 316.5 28.3

177.1 166.6 35.0 316.5 34.3

176.0 164.2 37.4 396.2 34.3

174.9 162.4 39.7 396.2 40.8

172.0 161.0 42.0 536.3 40.8

170.8 159.9 44.3 536.3 50.0

168.9 159.0 46.7 536.3 50.0

167.8 158.3 49.0

166.5 157.7 51.3

164.3 157.3 53.7

167.5 156.9 55.9

166.1 156.6 58.3

163.5 156.4 60.7

163.0 156.2 63.0

162.1 156.0 65.3

155.9 155.9 67.6

149.2 155.8 69.9

147.3 155.7 72.3

146.5 155.6 74.5 Vs30 217.3

149.3 155.5 77.0

148.7 155.5 79.3

Figure A18.— Surface wave dispersion curve and shear wave velocity inversion data for site 705CPP.
TRINET Site Classification

Site ID 706GSA

NEHRP CLASS: D

Vs30 325 (m/s)

SUB-CLASS D+

Vs40 337 (m/s)

Location USGS Office, Pasadena

SMR Station 234

State CALIFORNIA 

POSITION DEGREES

GPS LAT (NORTH) 34.13664

GPS LONG (WEST 118.01276

Data Type SWEPT-SINE SASW

Investigators KAYEN, CARKIN, TINSLEY

Date collected 9/19/2004

(B) Combined Field-Dispersion Curves

TEST METHOD CONTINUOUS HARMONIC WAVE-SASW

PROJECT NAME TRINET

SPONSORS EHZ-SCEC

SITE SUB CLASS: Vs30 (m/s)

A >1500 m/s

B+ 1080 < Vs30 ≤ 1500 m/s

B- 720 < Vs30 ≤ 1080 m/s

C+ 540 < Vs30 ≤ 720 m/s

C- 360 < Vs30 ≤ 540 m/s

D+ 270 < Vs30 ≤ 360 m/s

D- 180 < Vs30 ≤ 270 m/s

E <180 m/s

F Special Soil Conditions: Liquefiable soils; quick 

and high sensitivity clays; collapsible cemented soils; 

peats>3m; high (>75) PI soils thicker than 8m; 

soft/medium stiff clays thicker than 36m.

(C) Inversion-based theoretical dispersion curve 

(A) Vs 40 meters profile (solid) and Vs30 (dashed) versus averaged field dispersion curve) 

Figure A19.—SASW site classification and location information for site 706GSA. The layered inversion model of shear wave velocity in the upper 30 meters is presented in 

the middle plot. The site dispersion curves are presented in the upper-right plot, and the comparison between the average site dispersion curve and theoretical dispersion 

curve is presented in the lower-left.

0

5

10

15

20

25

30

35

40

0 360 720

Vs (m/s)

z (m)

706GSA

Vs30

0

50

100

150

200

250

300

350

400

0 50 100 150

Frequency (Hz)

Phase Velocity (m/s)

Field Ave. Velocity (m/s)

Inverted Phase Velocity (m/s)
Figure A20.—Site 706GSA (SMR STA 234), located at the USGS office at CIT, Pasadena, Los Angeles County, California. Site location 34.13664°N 

 118.12762°W. Photo views: A) Looking west towards S. Lake Ave., B) looking north towards San Pasqual St., C) looking south towards E. California 

 Blvd., and D) looking west.

A

C

B

D
706GSA DISPERSION DATA INVERSION PROFILE

Site Disp. Vr (m/s) Theoretical Disp. Vr (m/s) Frequency (Hz) Inversion Vs (m/s) Depth (m)

400.0 4.8 242.2 0.0

354.1 353.9 5.5 242.2 1.7

351.2 346.0 7.7 271.1 1.7

332.1 331.7 10.0 271.1 3.5

311.7 315.7 12.2 243.9 3.5

303.9 299.5 14.7 243.9 5.6

289.8 287.9 16.9 307.1 5.6

272.1 278.5 19.2 307.1 8.0

267.6 271.0 21.6 309.2 8.0

264.6 265.5 23.9 309.2 10.7

265.2 261.4 26.3 326.8 10.7

266.4 258.3 28.6 326.8 13.7

260.4 256.0 30.9 351.5 13.7

257.8 254.1 33.2 351.5 17.0

250.6 252.8 35.3 361.5 17.0

247.3 251.5 37.8 361.5 20.6

244.8 250.6 40.1 373.7 20.6

248.7 249.7 42.4 373.7 24.5

249.5 249.0 44.8 377.8 24.5

248.3 248.3 47.1 377.8 40.0

244.0 247.6 49.4 377.8 40.0

243.6 247.0 51.7

243.7 246.4 54.1

245.1 245.7 56.3

245.7 245.1 58.7

243.4 244.5 61.0

240.9 243.9 63.3

238.2 243.2 65.6

239.2 242.6 67.9

243.5 242.0 70.0

252.0 241.4 72.6

250.5 240.8 74.8

247.9 240.2 77.2 Vs30 325.1

Figure A21.— Surface wave dispersion curve and shear wave velocity inversion data for site 706GSA.
TRINET Site Classification

Site ID 707CHN

NEHRP CLASS: D

Vs30 276 (m/s)

SUB-CLASS D+

Vs40 295 (m/s)

Location Chino

SMR Station 208

State CALIFORNIA 

POSITION DEGREES

GPS LAT (NORTH) 33.99965

GPS LONG (WEST 117.67734

Data Type SWEPT-SINE SASW

Investigators KAYEN, CARKIN, TINSLEY

Date collected 9/20/2004

(B) Combined Field-Dispersion Curves

TEST METHOD CONTINUOUS HARMONIC WAVE-SASW

PROJECT NAME TRINET

SPONSORS EHZ-SCEC

SITE SUB CLASS: Vs30 (m/s)

A >1500 m/s

B+ 1080 < Vs30 ≤ 1500 m/s

B- 720 < Vs30 ≤ 1080 m/s

C+ 540 < Vs30 ≤ 720 m/s

C- 360 < Vs30 ≤ 540 m/s

D+ 270 < Vs30 ≤ 360 m/s

D- 180 < Vs30 ≤ 270 m/s

E <180 m/s

F Special Soil Conditions: Liquefiable soils; quick 

and high sensitivity clays; collapsible cemented soils; 

peats>3m; high (>75) PI soils thicker than 8m; 

soft/medium stiff clays thicker than 36m.

(C) Inversion-based theoretical dispersion curve

 

Figure A22.—SASW site classification and location information for site 707CHN. The layered inversion model of shear wave velocity in the upper 30 meters is presented in 

the middle plot. The site dispersion curves are presented in the upper-right plot, and the comparison between the average site dispersion curve and theoretical dispersion 

curve is presented in the lower-left.

(A) Vs 40 meters profile (solid) and Vs30 (dashed) versus averaged field dispersion curve)

0

5

10

15

20

25

30

35

40

0 360 720

Vs (m/s)

z (m)

707CHN

Vs30

0

50

100

150

200

250

300

350

0 20 40 60 80

Frequency (Hz)

Phase Velocity (m/s)

Field Ave. Velocity (m/s)

Inverted Phase Velocity (m/s)
Figure A23.—Site 707CHN (SMR STA 208), located in Chino, San Bernardino County, California. Site location 33.99965°N 117.677342°W. Photo 

 views: A) Looking north towards Benson Ave, B) looking west towards SCE linesman training center C) looking northeast, and D) looking south towards 

 CHN substation.

A

C

B

D
707CHN DISPERSION DATA INVERSION PROFILE

Site Disp. Vr (m/s) Theoretical Disp. Vr (m/s) Frequency (Hz) Inversion Vs (m/s) Depth (m)

400.0 3.9 218.3 0.0

298.7 317.6 6.0 218.3 1.7

258.6 290.3 8.1 194.8 1.7

246.5 270.0 10.0 194.8 3.5

238.8 248.4 12.4 207.1 3.5

221.1 232.3 14.6 207.1 5.6

213.7 221.3 16.7 226.5 5.6

212.2 213.6 18.9 226.5 8.0

210.5 208.7 21.1 279.8 8.0

209.4 205.5 23.3 279.8 10.7

206.5 203.4 25.6 297.1 10.7

206.8 202.0 27.7 297.1 13.7

204.4 201.0 29.9 285.1 13.7

200.3 200.4 32.2 285.1 17.0

202.1 200.0 34.3 289.0 17.0

203.9 199.8 36.5 289.0 20.6

200.8 199.6 38.7 324.2 20.6

201.6 199.6 40.9 324.2 24.5

202.4 199.7 43.1 366.1 24.5

202.3 199.8 45.3 366.1 40.0

200.4 199.9 47.5 366.1 40.0

198.5 200.0 49.7

197.3 200.2 51.9

198.9 200.4 54.1

199.5 200.6 56.3

200.5 200.7 58.5

195.9 200.9 60.6

Vs30 276.5

Figure A24.— Surface wave dispersion curve and shear wave velocity inversion data for site 707CHN.
TRINET Site Classification

Site ID 708CRN

NEHRP CLASS: C

Vs30 367 (m/s)

SUB-CLASS CVs40 398 (m/s)

Location Corona SBC Telephone Bldg.

SMR Station 135

State CALIFORNIA 

POSITION DEGREES

GPS LAT (NORTH) 33.87525

GPS LONG (WEST 117.55939

SWEPT-SINE SASW

Investigators KAYEN, CARKIN, TINSLEY

Date collected 9/20/2004

(B) Combined Field-Dispersion Curves

TEST METHOD CONTINUOUS HARMONIC WAVE-SASW

PROJECT NAME TRINET

SPONSORS EHZ-SCEC

SITE SUB CLASS: Vs30 (m/s)

A >1500 m/s

B+ 1080 < Vs30 ≤ 1500 m/s

B- 720 < Vs30 ≤ 1080 m/s

C+ 540 < Vs30 ≤ 720 m/s

C- 360 < Vs30 ≤ 540 m/s

D+ 270 < Vs30 ≤ 360 m/s

D- 180 < Vs30 ≤ 270 m/s

E <180 m/s

F Special Soil Conditions: Liquefiable soils; quick 

and high sensitivity clays; collapsible cemented soils; 

peats>3m; high (>75) PI soils thicker than 8m; 

soft/medium stiff clays thicker than 36m.

(C) Inversion-based theoretical dispersion curve 

 

Figure A25.—SASW site classification and location information for site 708CRN. The layered inversion model of shear wave velocity in the upper 30 meters is presented in 

the middle plot. The site dispersion curves are presented in the upper-right plot, and the comparison between the average site dispersion curve and theoretical dispersion 

curve is presented in the lower-left.

(A) Vs 40 meters profile (solid) and Vs30 (dashed) versus averaged field dispersion curve)

0

5

10

15

20

25

30

35

40

0 360 720

Vs (m/s)

z (m)

708CRN

Vs30

0

50

100

150

200

250

300

350

400

450

500

0 20 40 60 80

Frequency (Hz)

Phase Velocity (m/s)

Field Ave. Velocity (m/s)

Inverted Phase Velocity (m/s)
Figure A26.—Site 708CRN (SMR STA 135), located at the SBC Telephone building, Corona, Riverside County, California. Site location 33.87525°N 

 117.55939°W. Photo views: A) Looking east in alley between E. 5th St. andE. 6th St., B) looking north along S. Joy St., C) looking west along alley, 

 and D) looking south along S. Joy St.

A

C

B

D
708CRN DISPERSION DATA INVERSION PROFILE

Site Disp. Vr (m/s) Theoretical Disp. Vr (m/s) Frequency (Hz) Inversion Vs (m/s) Depth (m)

545.0 6.9 290.6 0.0

472.6 461.8 6.3 290.6 2.2

392.3 390.3 9.4 300.8 2.2

372.4 361.5 11.7 300.8 4.6

372.6 348.2 13.7 297.7 4.6

345.7 335.2 16.3 297.7 7.4

336.2 324.7 18.3 381.7 7.4

331.3 312.7 20.5 381.7 10.6

313.6 301.0 23.0 412.4 10.6

293.4 292.7 25.4 412.4 14.2

297.9 287.2 27.5 385.0 14.2

295.2 283.1 29.7 385.0 18.2

299.3 279.9 32.1 370.8 18.2

295.8 277.6 34.4 370.8 22.6

290.0 275.9 36.7 402.3 22.6

289.6 274.6 39.0 402.3 27.4

292.1 273.6 41.2 468.9 27.4

292.2 272.8 43.5 468.9 32.6

287.5 272.2 45.8 565.7 32.6

286.7 271.6 48.1 565.7 40.0

283.7 271.1 50.4 565.7 40.0

282.8 270.6 52.6

284.0 270.2 55.0

282.7 269.8 57.2

282.7 269.5 59.4

282.7 269.1 61.8

282.7 268.7 64.1

282.7 268.4 66.2

282.7 268.0 68.6

282.7 267.6 70.9

282.7 267.6 73.2

Vs30 366.7

Figure A27.—Surface wave dispersion curve and shear wave velocity inversion data for site 708PDU.
TRINET Site Classification

Site ID 709MLS

NEHRP CLASS: D

Vs30 296 (m/s)

SUB-CLASS D+

Vs50 360 (m/s)

Location Mira Loma Substation

SMR Station 230

State CALIFORNIA 

POSITION DEGREES

GPS LAT (NORTH) 34.00841

GPS LONG (WEST 117.56463

Data Type SWEPT-SINE SASW

Investigators KAYEN, CARKIN, TINSLEY

Date collected 9/20/2004

(B) Combined Field-Dispersion Curves

TEST METHOD CONTINUOUS HARMONIC WAVE-SASW

PROJECT NAME TRINET

SPONSORS EHZ-SCEC

SITE SUB CLASS: Vs30 (m/s)

A >1500 m/s

B+ 1080 < Vs30 ≤ 1500 m/s

B- 720 < Vs30 ≤ 1080 m/s

C+ 540 < Vs30 ≤ 720 m/s

C- 360 < Vs30 ≤ 540 m/s

D+ 270 < Vs30 ≤ 360 m/s

D- 180 < Vs30 ≤ 270 m/s

E <180 m/s

F Special Soil Conditions: Liquefiable soils; quick 

and high sensitivity clays; collapsible cemented soils; 

peats>3m; high (>75) PI soils thicker than 8m; 

soft/medium stiff clays thicker than 36m.

(C) Inversion-based theoretical dispersion curve 

 

Figure A28.—SASW site classification and location information for site 709MLS. The layered inversion model of shear wave velocity in the upper 30 meters is presented in 

the middle plot. The site dispersion curves are presented in the upper-right plot, and the comparison between the average site dispersion curve and theoretical dispersion 

curve is presented in the lower-left.

(A) Vs 50 meters profile (solid) and Vs30 (dashed) versus averaged field dispersion curve)

0

5

10

15

20

25

30

35

40

45

50

0 360 720

Vs (m/s)

z (m)

709MLS

Vs30

0

50

100

150

200

250

300

350

400

0 20 40 60 80

Frequency (Hz)

Phase Velocity (m/s)

Field Ave. Velocity (m/s)

Inverted Phase Velocity (m/s)
Figure A29.—Site 709MLS (SMR STA 230), located at the Mira Loma Substation, Mira Loma, San Bernardino County,California. Site location 34.00841°N 

 117.56463°W. Photo views: A) Looking south toward E. Edison Ave, B) looking east towards S. Milliken Ave, C) looking southwest, and D) looking west 

 towards S. Haven Ave.

A

C

B

D
709MLS DISPERSION DATA INVERSION PROFILE

Site Disp. Vr (m/s) Theoretical Disp. Vr (m/s) Frequency (Hz) Inversion Vs (m/s) Depth (m)

503.0 4.7 175.5 0.0

358.3 364.8 5.1 175.5 2.8

333.7 342.0 7.3 231.8 2.8

309.6 322.1 8.9 231.8 5.8

289.5 302.1 10.6 234.8 5.8

270.9 284.0 12.4 234.8 9.3

267.7 269.6 14.2 340.2 9.3

260.2 258.8 15.9 340.2 13.3

248.0 250.7 17.7 346.6 13.3

241.8 244.6 19.4 346.6 17.8

239.6 238.6 21.2 366.9 17.8

234.8 232.5 23.0 366.9 22.8

234.5 225.5 24.7 371.3 22.8

227.3 217.7 26.4 371.3 28.3

215.1 209.8 28.1 377.4 28.3

208.4 202.0 30.0 377.4 34.3

204.0 196.0 31.7 516.0 34.3

198.7 191.1 33.5 516.0 40.8

190.4 187.1 35.2 678.9 40.8

187.2 184.0 37.0 678.9 50.0

183.8 181.4 38.8 678.9 50.0

180.9 179.3 40.5

178.0 177.6 42.2

176.3 176.2 44.0

170.4 174.9 45.7

170.6 173.8 47.5

176.8 172.9 49.2

172.8 172.2 50.9

175.4 171.4 52.8

176.2 170.8 54.5

173.2 170.2 56.3

172.4 169.7 58.0

173.1 169.3 59.8 Vs30 296.1

172.6 168.9 61.6

173.7 168.5 63.2

174.6 168.2 65.0

178.0 167.9 66.8

175.7 167.6 68.6

176.3 167.4 70.3

176.1 167.2 72.0

173.6 167.0 73.8

172.0 166.8 75.6

0.0 0.0 0.0

0.0 0.0 0.0

0.0 0.0 0.0

0.0 0.0 0.0

0.0 0.0 0.0

0.0 0.0 0.0

0.0 0.0 0.0

0.0 0.0 0.0

Figure A30.— Surface wave dispersion curve and shear wave velocity inversion data for site 709MLS.
TRINET Site Classification

Site ID 710PDU

NEHRP CLASS: C

Vs30 424 (m/s)

SUB-CLASS CVs40 542 (m/s)

Location Padua Substation, Upland

SMR Station 445

State CALIFORNIA 

POSITION DEGREES

GPS LAT (NORTH) 34.11801

GPS LONG (WEST 117.63962

Data Type SWEPT-SINE SASW

Investigators KAYEN, CARKIN, TINSLEY

Date collected 9/21/2004

(B) Combined Field-Dispersion Curves

TEST METHOD CONTINUOUS HARMONIC WAVE-SASW

PROJECT NAME TRINET

SPONSORS EHZ-SCEC

SITE SUB CLASS: Vs30 (m/s)

A >1500 m/s

B+ 1080 < Vs30 ≤ 1500 m/s

B- 720 < Vs30 ≤ 1080 m/s

C+ 540 < Vs30 ≤ 720 m/s

C- 360 < Vs30 ≤ 540 m/s

D+ 270 < Vs30 ≤ 360 m/s

D- 180 < Vs30 ≤ 270 m/s

E <180 m/s

F Special Soil Conditions: Liquefiable soils; quick 

and high sensitivity clays; collapsible cemented soils; 

peats>3m; high (>75) PI soils thicker than 8m; 

soft/medium stiff clays thicker than 36m.

(C) Inversion-based theoretical dispersion curve 

 

Figure A31.—SASW site classification and location information for site 710PDU. The layered inversion model of shear wave velocity in the upper 30 meters is presented in 

the middle plot. The site dispersion curves are presented in the upper-right plot, and the comparison between the average site dispersion curve and theoretical dispersion 

curve is presented in the lower-left.

(A) Vs 40 meters profile (solid) and Vs30 (dashed) versus averaged field dispersion curve)

0

5

10

15

20

25

30

35

40

0 360 720

Vs (m/s)

z (m)

710PDU

Vs30

0

100

200

300

400

500

600

0 50 100 150

Frequency (Hz)

Phase Velocity (m/s)

Field Ave. Velocity (m/s)

Inverted Phase Velocity (m/s)
Figure A32.—Site 710PDU (SMR STA 445), located at the Padua Substation, Upland, San Bernardino County,California. Site location 34.11801°N 

 117.63962°W. Photo views: A) Testing adjacent to Upland Fire Station, B) looking north on E. 15th St., C) looking northwest towards PDU substation, 

 and D) looking west towards Animal Shelter.

A

C

B

D
710PDU DISPERSION DATA INVERSION PROFILE

Site Disp. Vr (m/s) Theoretical Disp. Vr (m/s) Frequency (Hz) Inversion Vs (m/s) Depth (m)

551.0 6.0 252.6 0.0

496.9 493.8 7.7 252.6 1.7

468.1 472.5 9.8 288.0 1.7

462.2 445.1 12.1 288.0 3.5

442.0 425.0 14.3 388.1 3.5

427.8 409.8 16.6 388.1 5.6

416.5 398.5 18.9 408.0 5.6

419.1 389.1 21.1 408.0 8.0

409.9 380.4 23.4 414.8 8.0

383.2 371.5 25.7 414.8 10.7

384.8 362.8 27.9 427.1 10.7

375.0 352.8 30.2 427.1 13.7

370.3 342.4 32.5 441.2 13.7

356.7 332.0 34.7 441.2 17.0

344.6 321.8 37.0 461.8 17.0

313.9 312.5 39.3 461.8 20.6

312.9 304.1 41.6 497.2 20.6

315.5 296.8 43.9 497.2 24.5

308.8 290.4 46.2 551.3 24.5

306.0 285.1 48.4 551.3 40.0

301.0 280.4 50.7 551.3 40.0

295.7 276.4 53.0

292.4 273.0 55.2

287.4 270.0 57.5

288.2 267.3 59.7

282.5 264.9 62.1

276.7 262.9 64.3

272.0 261.1 66.6

270.2 259.4 68.9

263.7 257.8 71.2

264.2 256.5 73.4

266.3 255.4 75.5

267.0 254.2 77.9 Vs30 423.8

268.6 253.2 80.3

266.0 252.3 82.5

Figure A33.—Surface wave dispersion curve and shear wave velocity inversion data for site 710PDU.
TRINET Site Classification

Site ID 711FON

NEHRP CLASS: C

Vs30 405 (m/s)

SUB-CLASS CVs50 464 (m/s)

Location Fontana

SMR Station 449

State CALIFORNIA 

POSITION DEGREES

GPS LAT (NORTH) 34.09997

GPS LONG (WEST 117.43816

Data Type SWEPT-SINE SASW

Investigators KAYEN, CARKIN, TINSLEY

Date collected 9/21/2004

(B) Combined Field-Dispersion Curves

TEST METHOD CONTINUOUS HARMONIC WAVE-SASW

PROJECT NAME TRINET

SPONSORS EHZ-SCEC

SITE SUB CLASS: Vs30 (m/s)

A >1500 m/s

B+ 1080 < Vs30 ≤ 1500 m/s

B- 720 < Vs30 ≤ 1080 m/s

C+ 540 < Vs30 ≤ 720 m/s

C- 360 < Vs30 ≤ 540 m/s

D+ 270 < Vs30 ≤ 360 m/s

D- 180 < Vs30 ≤ 270 m/s

E <180 m/s

F Special Soil Conditions: Liquefiable soils; quick 

and high sensitivity clays; collapsible cemented soils; 

peats>3m; high (>75) PI soils thicker than 8m; 

soft/medium stiff clays thicker than 36m.

(C) Inversion-based theoretical dispersion curve 

 

Figure A34.—SASW site classification and location information for site 711FON. The layered inversion model of shear wave velocity in the upper 30 meters is presented in

the middle plot. The site dispersion curves are presented in the upper-right plot, and the comparison between the average site dispersion curve and theoretical dispersion

curve is presented in the lower-left.

(A) Vs 50 meters profile (solid) and Vs30 (dashed) versus averaged field dispersion curve)

0

5

10

15

20

25

30

35

40

45

50

0 360 720

Vs (m/s)

z (m)

711FON

Vs30

0

100

200

300

400

500

600

0 50 100 150

Frequency (Hz)

Phase Velocity (m/s)

Field Ave. Velocity (m/s)

Inverted Phase Velocity (m/s)
Figure A35.—Site 711FON (SMR STA 449), located in Fontana, San Bernardino County, California. Site location 34.09997°N 117.43816°W. Photo views:

 A) Looking west along Arrow Blvd., B) looking east along Arrow Blvd., C) looking north, and D) looking north toward Spring St. and the Santa Ana Mountains.

A

C

B

D
711FON DISPERSION DATA INVERSION PROFILE

Site Disp. Vr (m/s) Theoretical Disp. Vr (m/s) Frequency (Hz) Inversion Vs (m/s) Depth (m)

556.0 6.3 240.6 0.0

519.0 512.5 6.8 240.6 2.8

474.8 482.4 9.1 366.7 2.8

457.9 445.9 11.6 366.7 5.8

437.3 422.8 13.9 383.0 5.8

433.3 406.1 16.2 383.0 9.3

410.8 392.8 18.4 450.1 9.3

396.3 380.1 20.6 450.1 13.3

384.8 366.5 23.0 445.2 13.3

371.7 353.5 25.3 445.2 17.8

361.5 341.1 27.5 447.0 17.8

354.6 329.1 29.7 447.0 22.8

331.2 317.0 32.1 470.1 22.8

320.4 306.0 34.4 470.1 28.3

309.3 296.2 36.7 501.0 28.3

304.7 287.3 38.9 501.0 34.3

300.0 279.5 41.2 535.3 34.3

290.4 272.7 43.5 535.3 40.8

280.8 266.7 45.8 585.7 40.8

274.2 261.7 48.1 585.7 50.0

266.7 257.5 50.2 585.7 50.0

258.5 253.4 52.7

265.4 250.0 55.0

263.4 247.2 57.2

259.1 244.5 59.5

258.0 242.1 61.8

251.4 240.0 64.1

245.4 238.2 66.4

242.3 236.5 68.7

241.4 235.0 70.9

239.8 233.7 73.1

239.2 232.4 75.4

239.3 231.3 77.8 Vs30 404.7

239.1 230.3 80.0

239.6 229.3 82.3

239.8 228.5 84.7

242.7 227.7 86.9

244.8 227.0 89.2

243.1 226.4 91.5

241.4 225.8 93.7

240.8 225.3 95.9

240.3 224.8 98.3

Figure A36.—Surface wave dispersion curve and shear wave velocity inversion data for site 711FON.
TRINET Site Classification

Site ID 712CLT

NEHRP CLASS: D

Vs30 258 (m/s)

SUB-CLASS DLocation Colton

SMR Station 325

State CALIFORNIA 

POSITION DEGREES

GPS LAT (NORTH) 34.09338

GPS LONG (WEST 117.31172

Data Type SWEPT-SINE SASW

Investigators KAYEN, CARKIN, TINSLEY

Date collected 9/21/2004

(Merged Field-Dispersion Curves)

TEST METHOD CONTINUOUS HARMONIC WAVE-SASW

PROJECT NAME TRINET

SPONSORS EHZ-SCEC

SITE SUB CLASS: Vs30 (m/s)

A >1500 m/s

B+ 1080 < Vs30 ≤ 1500 m/s

B- 720 < Vs30 ≤ 1080 m/s

C+ 540 < Vs30 ≤ 720 m/s

C- 360 < Vs30 ≤ 540 m/s

D+ 270 < Vs30 ≤ 360 m/s

D- 180 < Vs30 ≤ 270 m/s

E <180 m/s

F Special Soil Conditions: Liquefiable soils; quick 

and high sensitivity clays; collapsible cemented soils; 

peats>3m; high (>75) PI soils thicker than 8m; 

soft/medium stiff clays thicker than 36m.

(Inverted-theoretical-dispersion curve versus average field

(Vs profile in upper 30 meters (solid) and Vs30 (dashed) curve, bars represent ±1σ range of merged field data)

 

Figure A37.—SASW site classification and location information for site 712CLT. The layered inversion model of shear wave velocity in the upper 30 meters is presented in

the middle plot. The site dispersion curves are presented in the upper-right plot, and the comparison between the average site dispersion curve and theoretical dispersion

curve is presented in the lower-left.

0

5

10

15

20

25

30

0 360 720

Vs (m/s)

z (m)

712CLT

Vs30

0

50

100

150

200

250

300

350

400

0 50 100 150

Frequency (Hz)

Phase Velocity (m/s)

Field Ave. Velocity (m/s)

Inverted Phase Velocity (m/s)
Figure A38.—Site 712CLT (SMR STA 325), located in Colton, San Bernardino County, California. Site location 34.09338°N 117.311715°W. Photo views: 

 A) Looking south toward W. Mill St., B) looking north towards the CLT Substation, C) looking east towards CLT Substation, and D) looking southwest 

 towards Atchison, Topeka & Santa Fe Railway and W. Mill St. overcrossing.

A

C

B

D
712CLT DISPERSION DATA INVERSION PROFILE

Site Disp. Vr (m/s) Theoretical Disp. Vr (m/s) Frequency (Hz) Inversion Vs (m/s) Depth (m)

446.0 4.8 156.9 0.0

315.5 334.7 5.6 156.9 1.7

278.4 305.6 7.8 180.3 1.7

237.1 258.4 10.0 180.3 3.5

208.4 228.6 12.2 184.7 3.5

194.6 208.2 14.7 184.7 5.6

190.6 196.4 17.0 213.7 5.6

186.0 188.4 19.3 213.7 8.0

176.0 182.4 21.7 220.0 8.0

172.2 178.1 23.9 220.0 10.7

170.5 174.6 26.3 282.5 10.7

167.9 171.7 28.6 282.5 13.7

169.8 169.2 30.9 285.0 13.7

170.1 167.0 33.2 285.0 17.0

166.9 165.0 35.5 323.8 17.0

165.4 163.2 37.9 323.8 20.6

165.6 161.6 40.1 331.1 20.6

165.5 160.2 42.5 331.1 24.5

163.5 158.8 44.8 349.9 24.5

161.9 157.7 47.1 349.9 30.0

161.2 156.6 49.4 349.9 30.0

161.0 155.7 51.7

155.0 154.8 54.0

148.7 154.1 56.4

150.0 153.4 58.7

149.0 152.8 61.0

149.5 152.3 63.3

149.5 151.9 65.7

147.9 151.5 67.9

146.5 151.1 70.2

143.8 150.8 72.6

142.7 150.6 74.9

141.7 150.3 77.2 Vs30 257.9

Figure A39.—Surface wave dispersion curve and shear wave velocity inversion data for site 712CLT.