HR: 0830h
AN: S51E-0089    [PDF]
TI: Site Characteristics Of Chia-Yi City, Taiwan, Estimated from Array And Single-Station Records Of Microtremors
AU: * Huang, H
EM: seihuey@eq.ccu.edu.tw
AF: Huey-Chu Huang, Institute of Seismology, National Chung Cheng University #160 San-Hsing, Ming-Hsiung, Chia-Yi, 621 Taiwan
AB: The site characteristics in the Chia-Yi City of Taiwan were investigated using the H/V ratios of microtremors. Only five strong-motion stations were deployed in Chia-Yi City, the microtremor measurements at 94 points and the microtremor array measurements at four sites therefore are necessary to conduct in the study. The predominant frequencies obtained from H/V ratios of earthquake recordings are consistent with those from microtremor data although the amplification factors of microtremors are underestimated. On the basis of the H/V ratios of microtremors, the site response can be divided into three groups by shape and match well with the geological condition. Basically, the western area of Chia-Yi City is composed of alluvial structure with higher amplification factors and lower predominant frequencies (1.1-1.9Hz) while the eastern side is the mountainous area with unclear or higher predominant frequency. It indicates that the depths of the alluvium gradually increase from the eastern side to the western side. Besides, the highest ground vulnerability index (Kg) values appear in the southwestern part of the Chia-Yi City.
UR: http://www/agu.org
DE: 7212 Earthquake ground motions and engineering
SC: Seismology [S]
MN: 2003 Fall Meeting