The Distribution of Strong Ground Motion from the 2001 Geiyo Earthquake and the Deep Underground Structure

The Distribution of Strong Ground Motion from the 2001 Geiyo Earthquake and the Deep Underground Structure
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2001年艺叶地震强地震动分布与深层地下结构

DOI:
10.4294/zisin1948.55.2_97
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发表时间:
2002
期刊:
Journal of the Seismological Society of Japan
影响因子:
--
通讯作者:
T. Furumura
T. Furumura
中科院分区:
--
文献类型:
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作者:
K. Koketsu;T. Furumura

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小越和,古村隆,东京大学地震研究所,弥生1-1-1,文京区,东京113-0032(接收日期:2001年12月13日;接受日期:2002年6月14日)根据强震分布、观测地震图及其频谱,推断出2001年嘉余地震西部地区的地震运动有明显的衰减。由于这种衰减甚至在钻孔运动的分布中也被识别出来,因此假设这种衰减出现在更深的部分,如地幔楔。如果我们假设地幔楔中存在低Q带,Qs= 20-30的强运动模拟可以再现观测结果。该带可能与菲律宾板块脱水有关。
Kazuki KOKETSU and Takashi FURUMURA Earthquake Research Institute, Universityof Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-0032, Japan (Received December 13, 2001; Accepted June 14, 2002) The significant attenuation of seismic motion in the west of the 2001 Geiyo earthquake is inferrec from strong motion distributions, observed seismograms and their spectra. Since this attenuation identified even in the distribution of borehole motions, that is assumed to arise in a deeper part like the mantle wedge. If we assume a low-Q zone in the mantle wedge, a strong motion simulation with Qs= 20-30 can reproduce the observations. This zone may be related to dehydration of the Philippine see plate.