Quick Search:    advanced search

GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Web of Science (11) Citing Articles via Google Scholar Google Scholar Articles by Tsuboi, S. Articles by Ishihara, Y. Search for Related Content GeoRef GeoRef Citation

Verification of Horizontal-to-Vertical Spectral-Ratio Technique for Estimation of Site Response Using Borehole Seismographs

Faculty of Science
Yokohama City University
22-2 Seto, Kanazawa-ku
Yokohama 236-0027, Japan
tsuboi{at}yokohama-cu.ac.jp
(S.T., M.S., Y.I.)

The City of Yokohama has established a high-density strong-motion seismograph network in 1997 to enable rapid evaluation of seismic hazard in case of disastrous earthquakes. It consists of 150 surface strong-motion seismographs and nine borehole strong-motion seismographs within the city area, which is approximately 20 km x 30 km wide. We use seismograms recorded by the borehole seismographs of the network from seven earthquakes that occurred around Yokohama. We calculate the S-wave spectral ratio between the surface seismograph and the borehole seismograph and compare it with a synthetic spectral ratio calculated from a velocity profile of the borehole. The agreement of observed and synthetic spectral ratios is excellent, which shows that we may use these borehole seismographs to test various techniques for estimation of the site amplification. We then apply the horizontal-to-vertical (H/V) spectral-ratio technique for seismograms recorded at the surface and compare them with these spectral ratios. The results show that the H/V ratio technique gives a good estimate of the surface amplification for frequency range between about 1 and 4 Hz, if the near-surface velocity structure is relatively simple and if the signal-to-noise ratio of seismograms recorded at the surface is adequate.

This article has been cited by other articles:

				K. Read, H. El Naggar, and D. Eaton Site-Response Spectra for POLARIS Station Sites in Southern Ontario and Quebec Seismological Research Letters, November 1, 2008; 79(6): 776 - 784. [Full Text] [PDF]

				K. Tsuda, R. J. Archuleta, and K. Koketsu Quantifying the Spatial Distribution of Site Response by Use of the Yokohama High-Density Strong-Motion Network Bulletin of the Seismological Society of America, June 1, 2006; 96(3): 926 - 942. [Abstract] [Full Text] [PDF]

				T. L. Pratt and T. M. Brocher Site Response and Attenuation in the Puget Lowland, Washington State Bulletin of the Seismological Society of America, April 1, 2006; 96(2): 536 - 552. [Abstract] [Full Text] [PDF]

				Empirical Attenuation of Ground-Motion Spectral Amplitudes in Southeastern Canada and the Northeastern United States Bulletin of the Seismological Society of America, June 1, 2004; 94(3): 1079 - 1095.

				R. R. Castro, F. Pacor, D. Bindi, G. Franceschina, and L. Luzi Site Response of Strong Motion Stations in the Umbria, Central Italy, Region Bulletin of the Seismological Society of America, April 1, 2004; 94(2): 576 - 590. [Abstract] [Full Text] [PDF]

				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.