Site amplification factor of the Hi-net stations

Tomotake UENO; Tatsuhiko SAITO; Katsuhiko SHIOMI

Presentation information

Oral

Symbol S (Solid Earth Sciences) » S-SS Seismology

[S-SS27_29AM2] Seismic wave propagation: Theory and Application

Tue. Apr 29, 2014 11:00 AM - 12:45 PM 411 (4F)

Convener:*Tatsuhiko Saito(National Research Institute for Earth Science and Disaster Prevention), Hisashi Nakahara(Solid Earth Physics Laboratory, Department of Geophysics, Graduate School of Science, Tohoku University), Jun Matsushima(School of Engineering, The University of Tokyo), Kiwamu Nishida(Earthquake Research Institute, University of Tokyo), Kazuya Shiraishi(JGI, Inc.), Chair:Ryota Takagi(Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University), Nana Yoshimitsu(Earthquake Research Institute, University of Tokyo)

12:15 PM - 12:30 PM

[SSS27-12] Site amplification factor of the Hi-net stations

*Tomotake UENO¹, Tatsuhiko SAITO¹, Katsuhiko SHIOMI¹ (1.NIED)

Keywords:Hi-net, Site amplification factor

This study estimated site amplification factors of all the Hi-net stations. Employing the coda normalization method and analyzing more than one thousand earthquakes, we obtained the values of all Hi-net sites in the frequency bands of 0.6-1.0 Hz, 1-3 Hz, 2-4 Hz, 2-6 Hz, 4-8 Hz, 6-9Hz, and 8-12 Hz. The cite amplification factors were rather small showing that 90 % of the cite amplification factors ranged within 20 dB. The site amplification varies from station to station more largely with decreasing the frequency. A correlation between the site amplification factor and the S-wave velocity where the sensor is installed was recognized. The cite amplification factor decreases with increasing the S-wave velocity when the S-wave velocity is less than 1.5 km/s. When the S-wave velocity is larger than 1.5 km/s, the correlation disappears. Stations in southwest Japan show smaller site amplification factors, while stations in plains and around the volcanic front in the northeastern Honshu, Japan show larger site amplification factors.