| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
University of California
Institute for Crustal
Studies
Santa Barbara, California
This study determines site-response factors that can be applied as corrections to a rock-attenuation relationship for use in probabilistic seismic-hazard analysis. The site-response factors are amplitude and site-class dependent. These amplification factors are determined by averaging ratios between observed and predicted ground motions for peak ground acceleration (PGA) and for 5% damped response spectral acceleration at 0.3, 1.0, and 3.0 sec oscillator periods. The observations come from the strong-motion database of the Southern California Earthquake Center (SCEC), and the predictions are based on the Sadigh (1993) rock-attenuation relation. When separated and averaged according to surface geology, significantly different site-response factors are found for Quaternary and Mesozoic units, but a subclassification of Quaternary is generally not justified by the data. The low inputmotion amplification factors are consistent with those obtained from independent aftershock studies at the PGA and 0.3-second period. An observed trend of decreasing Quaternary site amplification with higher input motion is consistent with nonlinear soil behavior; however, the trend exists for Mesozoic sites as well, implying that this may be an artifact of the Sadigh relationship. There is a correlation between larger site-response factors and lower average shear-wave velocity in the upper 30 m for low predicted PGA input motions, with an increase in the correlation with increasing period. The 0.3-sec site response factors for Quaternary data in southern California determined in this study are consistent with 0.3-sec NEHRP site-response correction factors; however, at 1.0-sec period some inconsistencies remain. A trend is also seen with respect to sediment basin depth, where deeper sites have higher average site-response factors. These results constitute a customized attenuation relationship for southern California. The implication of these customized attenuation models with respect to probabilistic hazard analysis is examined in Field and Petersen (2000).
This article has been cited by other articles:
|
|
 |
|
  A. O. Kwok and J. P. Stewart Evaluation of the Effectiveness of Theoretical 1D Amplification Factors for Earthquake Ground-Motion Prediction Bulletin of the Seismological Society of America, August 1, 2006; 96(4A): 1422 - 1436. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. P. Stewart, Y. Choi, R. W. Graves, and J. H. Shaw Uncertainty of Southern California Basin Depth Parameters Bulletin of the Seismological Society of America, October 1, 2005; 95(5): 1988 - 1993. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
B. Halldorsson and A. S. Papageorgiou Calibration of the Specific Barrier Model to Earthquakes of Different Tectonic Regions Bulletin of the Seismological Society of America, August 1, 2005; 95(4): 1276 - 1300. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
Y. Choi, J. P. Stewart, and R. W. Graves Empirical Model for Basin Effects Accounts for Basin Depth and Source Location Bulletin of the Seismological Society of America, August 1, 2005; 95(4): 1412 - 1427. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S. Marin, J.-P. Avouac, M. Nicolas, and A. Schlupp A Probabilistic Approach to Seismic Hazard in Metropolitan France Bulletin of the Seismological Society of America, December 1, 2004; 94(6): 2137 - 2163. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. Gomberg, B. Waldron, E. Schweig, H. Hwang, A. Webbers, R. VanArsdale, K. Tucker, R. Williams, R. Street, P. Mayne, et al. Lithology and Shear-Wave Velocity in Memphis, Tennessee Bulletin of the Seismological Society of America, June 1, 2003; 93(3): 986 - 997. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
Amplification Factors for Spectral Acceleration in Tectonically Active Regions Bulletin of the Seismological Society of America, February 1, 2003; 93(1): 332 - 352.
|
|
|
|
|
|
Empirical Evidence for Acceleration-Dependent Amplification Factors Bulletin of the Seismological Society of America, March 1, 2002; 92(2): 761 - 782.
|
|
|
|
|
|
E. H. Field and the SCEC Phase III Working Group Accounting for Site Effects in Probabilistic Seismic Hazard Analyses of Southern California: Overview of the SCEC Phase III Report Bulletin of the Seismological Society of America, December 1, 2000; 90(6B): S1 - S31. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S.-D. Ni, J. G. Anderson, Y. Zeng, and R. V. Siddharthan Expected Signature of Nonlinearity on Regression for Strong Ground-Motion Parameters Bulletin of the Seismological Society of America, December 1, 2000; 90(6B): S53 - S64. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
H. Magistrale, S. Day, R. W. Clayton, and R. Graves The SCEC Southern California Reference Three-Dimensional Seismic Velocity Model Version 2 Bulletin of the Seismological Society of America, December 1, 2000; 90(6B): S65 - S76. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. H. Steidl and Y. Lee The SCEC Phase III Strong-Motion Database Bulletin of the Seismological Society of America, December 1, 2000; 90(6B): S113 - S135. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
Y. Lee and J. G. Anderson Potential for Improving Ground-Motion Relations in Southern California by Incorporating Various Site Parameters Bulletin of the Seismological Society of America, December 1, 2000; 90(6B): S170 - S186. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
E. H. Field A Modified Ground-Motion Attenuation Relationship for Southern California that Accounts for Detailed Site Classification and a Basin-Depth Effect Bulletin of the Seismological Society of America, December 1, 2000; 90(6B): S209 - S221. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
E. H. Field and M. D. Petersen A Test of Various Site-Effect Parameterizations in Probabilistic Seismic Hazard Analyses of Southern California Bulletin of the Seismological Society of America, December 1, 2000; 90(6B): S222 - S244. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
