| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
Kobori Research Complex Kajima Corporation,, 6-5-30 Akasaka, Minato-ku, Tokyo 107, Japan
Geological Sciences University of Southern California, Los Angeles, California 90089-0740
Abstract
The subject of this article is to see if the response to S waves at a specific site can be determined from coda waves. We used aftershock records of the 1992 Landers and Big Bear earthquakes observed at four TERRAscope stations (PAS, PFO, SVD, and GSC) in southern California. The wide dynamic range of the TERRAscope instrument provided a broadband seismogram for S waves, and, at the same time, coda waves over a long lapse-time window. We analyzed a total of 708 three-component waveforms from 65 events whose magnitudes ranged from 3.3 to 5.4. The station SVD is located on Quaternary alluvium, and the remaining stations are on rocks of Cretaceous age. We first evaluated the coda site-amplification factor using a spectral ratio method (May-eda et al., 1991; Koyanagi et al., 1992) for frequency bands centered at 0.75, 1.0, 1.5, 2.0, 3.0, 4.0, and 6.0 Hz for lapse-time windows after 70 sec from the origin time. We found that the site-amplification factor for the radial component is similar to that for the transverse component. This similarity was expected because codas consist of backscattered waves coming from all directions into the station, resulting in a directionally averaged site response. We then evaluated the S-wave site-amplification factor using an inversion method (Andrews, 1986) on the direct S-wave portion of the same data set. We found that the coda site response agrees with the S-wave site response within a factor of about 1.5, supporting the earlier findings by Tsujiura (1978) and justifying the use of coda waves in determining site-specific amplification for S waves. This agreement between S-wave site response and coda site response is understandable if we assume that coda waves are dominated by S waves, as theoretically predicted by Aki (1992) and Zeng (1993).
This article has been cited by other articles:
|
|
 |
|
  D. Assimaki, W. Li, J. H. Steidl, and K. Tsuda Site Amplification and Attenuation via Downhole Array Seismogram Inversion: A Comparative Study of the 2003 Miyagi-Oki Aftershock Sequence Bulletin of the Seismological Society of America, February 1, 2008; 98(1): 301 - 330. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
W. Salazar, V. Sardina, and J. de Cortina A Hybrid Inversion Technique for the Evaluation of Source, Path, and Site Effects Employing S-Wave Spectra for Subduction and Upper-Crustal Earthquakes in El Salvador Bulletin of the Seismological Society of America, February 1, 2007; 97(1B): 208 - 221. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
T. Takahashi, H. Sato, M. Ohtake, and K. Obara Scale Dependence of Apparent Stress for Earthquakes along the Subducting Pacific Plate in Northeastern Honshu, Japan Bulletin of the Seismological Society of America, August 1, 2005; 95(4): 1334 - 1345. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
Detection of Localized Small-Scale Heterogeneities in the Hanshin-Awaji Region, Japan, by Anomalous Amplification of Coda Level Bulletin of the Seismological Society of America, August 1, 2003; 93(4): 1516 - 1530.
|
|
|
|
|
|
Separation of Site Effects and Structural Focusing in Santa Monica, California: A Study of High-Frequency Weak Motions from Earthquakes and Blasts Recorded during the Los Angeles Region Seismic Experiment Bulletin of the Seismological Society of America, December 1, 2002; 92(8): 3134 - 3151.
|
|
|
|
|
|
Borehole Response Studies at the Garner Valley Downhole Array, Southern California Bulletin of the Seismological Society of America, December 1, 2002; 92(8): 3165 - 3179.
|
|
|
|
|
|
Empirical Green's Function Analysis of Recent Moderate Events in California Bulletin of the Seismological Society of America, June 1, 2001; 91(3): 456 - 467.
|
|
|
|
|
|
Differences Between Site Characteristics Obtained From Microtremors, S-waves, P-waves, and Codas Bulletin of the Seismological Society of America, April 1, 2001; 91(2): 313 - 334.
|
|
|
|
|
|
Estimation of S-Wave Site Response in Anchorage, Alaska, from Weak-Motion Data Using Generalized Inversion Method Bulletin of the Seismological Society of America, April 1, 2001; 91(2): 335 - 346.
|
|
|
|
|
|
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. C. Harmsen Determination of site amplification in the Los Angeles urban area from inversion of strong-motion records Bulletin of the Seismological Society of America, August 1, 1997; 87(4): 866 - 887. [Abstract] [PDF]
|
|
|
|
|
|
S. C. Harmsen Estimating the diminution of shear-wave amplitude with distance: Application to the Los Angeles, California, urban area Bulletin of the Seismological Society of America, August 1, 1997; 87(4): 888 - 903. [Abstract] [PDF]
|
|
|
|
|
|
S. Gao A Bayesian nonlinear inversion of seismic body-wave attenuation factors Bulletin of the Seismological Society of America, August 1, 1997; 87(4): 961 - 970. [Abstract] [PDF]
|
|
|
|
|
|
L. F. Bonilla, J. H. Steidl, G. T. Lindley, A. G. Tumarkin, and R. J. Archuleta Site amplification in the San Fernando Valley, California: Variability of site-effect estimation using the S-wave, coda, and H/V methods Bulletin of the Seismological Society of America, June 1, 1997; 87(3): 710 - 730. [Abstract] [PDF]
|
|
|
|
|
|
C. Lachet, D. Hatzfeld, P.-Y. Bard, N. Theodulidis, C. Papaioannou, and A. Savvaidis Site effects and microzonation in the city of Thessaloniki (Greece) comparison of different approaches Bulletin of the Seismological Society of America, December 1, 1996; 86(6): 1692 - 1703. [Abstract] [PDF]
|
|
|
|
|
|
E. H. Field Spectral amplification in a sediment-filled Valley exhibiting clear basin-edge-induced waves Bulletin of the Seismological Society of America, August 1, 1996; 86(4): 991 - 1005. [Abstract] [PDF]
|
|
|
|
|
|
F. Su, J. G. Anderson, J. N. Brune, and Y. Zeng A comparison of direct S-wave and coda-wave site amplification determined from aftershocks of the Little Skull Mountain earthquake Bulletin of the Seismological Society of America, August 1, 1996; 86(4): 1006 - 1018. [Abstract] [PDF]
|
|
|
|
|
|
E. H. Field and K. H. Jacob A comparison and test of various site-response estimation techniques, including three that are not reference-site dependent Bulletin of the Seismological Society of America, August 1, 1995; 85(4): 1127 - 1143. [Abstract] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
