Document: NUREG-0800
Document ID: c6cc946d-0eb9-4625-8de1-3db909a1cace
Document Type: srp
Title: Seismic Wave Transmission Characteristics of the Site.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0423/ML042390209.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.5.2.5
CFR Part: 
CFR Title: 

Content:
urfaee at the top of the finished grade. The free ficld ground moetion 29 . or control motion should bc consistent with thc propertics of thc soil 30 .prefil. For itcz eompeed of on or mo : ti l.layer overlying a 31 eempctcnt material, or in ease of Anuffiint rerded gro motion data, 32 thc control point is specified on an outcrop or a hypothetical outcrop at a 33 location on the top of the competent material. The control motion specified 34 should bc consistent with thc propertics of thc competent matcrial. 2.5.2-10 1 Where vertically propagating shear waves may produce the maximum ground 2 motion, a one-dimensional equivalent-linear analysis (e.g., Ref. 23 or 24 3 or nonlinear analysis (e.g., Refs. 25, 26, and 27 ) may be 4 appropriate and is reviewed in conjunction with geotechnical and structural 5 engineering. Where horizontally propagating shear waves, compressional waves, 6 or surface waves may produce the maximum ground motion, other methods of 7 analysis (e.g., Refs. 28 and 29 I) may be more appropriate. However, 8 since some of the variables are not well defined and the techniques are still 9 in the developmental stage, no generally agreed-upon procedures can be 10 promulgated at this time. Hence, the staff must use discretion in reviewing 11 any method of analysis. To ensure app-ropriateness, site response 12 characteristics determined from analytical procedures should be compared with 13 historical and instrumental earthquake data, when available. 14 15 16 17 18 19 20 21 22 23