TSUNAMI SIMULATION OF THE 1994 JAVA EARTHQUAKE FOR TSUNAMI HAZARDASSESSMENT ALONG THE SOUTHERN COAST OF EAST JAVA, INDONESIA
By BUDIARTA (Tsunami Course, 2013)
Meteorological, Climatological and Geophysical Agency, Jakarta, Indonesia

1. Fault Parameters of Tsunami Sources
Table 1. Source parameters of the 1994 Java earthquake for tsunami modeling.

SourceModel
12345

Sub Fault Lat Lon Length Width Strike Dip Rake Slip Depth µMo(deg) (deg) (km) (km) (deg) (deg) (deg) (m) (m) (GPa) (Nm)
-10.65 113.76 160 80 280 12 90 0.91 8600 30 3.50E+20A -10.54 112.86 3755 280 12 90 1.20 9000 30 7.33E+19
B -10.58 113.3 3030 280 12 90 1.30 10600
3.51E+19C -10.65 113.76 3550 280 12 90 1.00 8600
5.25E+19D-10.4 113.6 85
40 280 12 90 2.00 15600
2.04E+20Total
3.65E+20-10.65 113.76 160 80 280 12 90 16.00 8600 30 6.14E+21-11 113.7 160 40 280 12 90 8.30 1700 10 5.31E+20-11 113.7 160 40 280 12 90 18.00 010 1.15E+21Mw
7.6
7.2
7.0
7.1
7.5
7.6
8.5
7.8
8.0

1

Height (m)1aHeight (m)2aHeight (m)3aFigure 1. Right: Seafloor deformation from top to down in Cases 1a, 2a and 3a.
Left: Location of assumed fault location.

2Height (m)4aHeight (m)4bHeight (m)5bFigure 2. Right: Seafloor deformation from top to down in Cases 4a, 4b and 5b.
Left: Location of assumed fault location

3Table 2. Tsunami heights measured by Tsuji et al (1995), used to validate tsunami and inundation
modelling for comparing with field survey data.
NoLongitude

Latitude

Heighto( S)o( E)Abv MSL (m)Kuta

8.7095115.1657

12

Tanah Lot

8.6198115.0858

1.8

3

Soka

8.5265114.9932

3.7

4

Antor

8.5275114.9953

4.1

5

Surabratan

8.4746114.93032.6

6Penggraguan

8.4633114.9077

3.2

7

Pakutatan

8.4336114.8235

2.8

8

Rambutsiwi

8.4050114.7672

2.7

Tg.Purwa5

8.7395114.3427

5.6

10

G-Land, Plengkung

8.6948114.3760

411

Trianggul Asih1

8.6568114.3607

4.9

12

Grajagan West2

8.6081114.2267

4.1

13

Purwoasri

8.6151

114.1138

1.3

14Lampon East

8.6000114.0967

9.3

15

Pancer8.5900114.0050

9.4

16

Rajekwesi

8.5565113.9352

13.9

17Bandialit W

8.4823113.7113

618

Besini-Ngarpuger

8.3803113.4655

5.9

19

Geten

8.3861113.4082

3.1

1

9Bali

Banyuwangi

Village

20

Lumajang

Bambangan

8.2893113.1085

4.6

21

MalangSendangbiru

8.4166112.7103

3.6

22

Sempu Is8.4293112.6922

2.7

23

Ngliyep

8.3500112.3533

4.3

Tambakrejo

8.3000112.0833

5.4

25Sine Gulf

8.2666111.8833

4.2

26

Gerangan

8.2570111.8398

5.527Brumbung

8.2616111.8337

4.8

28

Popoh Port

8.2630111.8043

3.9

29Sidem

8.2556111.8000

3.1

24

4

Regency

Tulungagung

2.

Assumed Output Points

Table 3. Location of output points Layer 2.
Point No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15

Longitude
115.1590
115.0810
114.9930
114.9830
114.9300
114.9080
114.8240114.7720
114.3580
114.3660
114.3620
114.2340
114.1140114.0970
114.0050

Latitude-8.7136

Depth (m)0.667

Point No.
16

Longitude
113.9350

Latitude-8.5732

Depth (m)3.704

-8.6191

0.601

17113.7110-8.5281

4.074-8.5406

1.184

18

113.4670-8.3833

4.000-8.53373.073

19113.4180-8.3900

0.593-8.48542.39

20

113.1090-8.2894

4.145-8.46691.163

21

112.7110-8.4280

6.741-8.43375.594

22112.6950-8.4340

3.674-8.40026.074

23

112.3530-8.3504

0.481-8.66090.063

24

112.0830-8.3170

1.748-8.68991.573

25

111.8660-8.2670

5.096-8.7422-8.6084-8.6114-8.6115-8.6005

0.31
10.259
0.444
6.148
1.926

26
27
28
29

111.8480111.8310
111.8050
111.7990-8.2650-8.2690-8.2622-8.2616

1.444
1.324
1.000
1.667

Point No. Longitude Latitude
16
113.9340-8.569617113.7120-8.485918
113.4670-8.3819

Depth (m)
7.298
4.694
0.039

Table 4. Location of output points Layer 3.
Point No.
Longitude1
115.16602
115.08203
114.9900

Latitude-8.7097-8.6194-8.5284

Depth (m)
2.117
4.356
5.305

4

114.9920-8.52974.179

19

113.4070-8.38741.257

5

114.9250-8.47524.382

20

113.1090-8.2874

6.6576114.9050-8.46366.96

21112.7150-8.4208

1.944

7

114.8230-8.43632.656

22112.7160-8.4326

12.417

8

114.7650-8.40862.498

23112.3570-8.35310.719

9114.3360-8.74029.943

24

112.0840-8.32142.98

10114.3720-8.69453.643

25

111.8620-8.2783

7.938

11
1213
14
15

114.3550
114.2310
114.1140114.0970
114.0070-8.6588-8.6090-8.6131-8.6131-8.5907

2.018
1.238
60.56462.10410.315262728
29111.8480111.8450
111.7990
111.7940-8.2692-8.2714-8.2661-8.2596

1.172
0.072
8.602
5.079

5

Figure 3. Assumed output points in southern East Java and Bali by red triangles.

63. Results (Tsunami Height)

1614
12Height (m)

1086
420

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
1a2a3asurvey

Figure 4. Comparison of tsunami heights in Cases 1a, 2a, 3a with field survey dataat all coastal output points.

161412Height (m)1086420

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 294a4b5bsurvey

Figure 5. Comparison of tsunami heights in Cases 4a, 4b, 5b with the field survey dataat all coastal output points.

7

Figure 6. Comparison of Case 5b with the field survey data. Red bars show
the result of tsunami modeling and blue bars show the field survey data.

84. Conditions for Computation

Table 5. Computation layers and data used for simulation.
Layer

LatitudeLongitude

Bathymetrydata

114oS -5oS

105oE-116oE

210oS -8oS

34Topography
data

Spatialgrid size

Grid (nx x ny)
dimension

GEBCO 1
arc-min1
arc-min

661 x 541

110.5oE-115.5oE

GEBCO 1
arc-min

0.33333
arc- min

901 x 601

9oS -8.16oS

111.5oE-115.33oE

GEBCO 30
arc-sec

0.11111
arc-min

2071 x 471

8.75oS -8.5oS

113.75oE-114.25oE

GEBCO 30
arc-sec

0.03704
arc-min

810 x 405

SRTM 3arc-sec

The temporal grid size (∆t) is set to 3.0 s.

9