%0 Journal Article
%T S-wave attenuation tomography of upper crust in Japan<br>日本上地壳S波衰减成像
%A PEI Shun-Ping
%A SU Jin-Rong
%A GAO Xing
%A ZHAO Jun-Meng
%A LIU Hong-Bing
%A <br>裴顺平
%J 地球物理学报
%D 2008
%I 
%X Seismic attenuation (Q-factor) can be estimated by extracting the amplitude-frequency information contained in seismic waveforms. We applied ML amplitude tomography to estimate attenuation of upper crust in Japan. More than 60000 Sg-wave maximum amplitude data from 5559 events recorded by 971 stations were selected from the dense High-Sensitivity Seismographic Network (Hi-net) under the condition that epicentral distance is less than 2°; event depth is less than 10km. The lateral S-wave Q-factor variations of upper crust at 1Hz in Japan were obtained, and the result indicates that the low Q values exist in the central Japan islands, and have almost the same distribution with volcanoes; the low-Q zones also exist in non-volcanic regions at the Kyoto and Kobe prefectures, and eastern Shikoku with dense faults there; in addition, low Q was found between eastern coast and Japan trench. These suggest that the high attenuation (low Q value) results from high temperature, cracked rocks and thick sediment. The high Q values mainly exist between the front of volcanoes and the Japanese east coast.
%K Japan
%K Seismic attenuation
%K S-wave
%K Amplitude tomography<br>日本
%K 地震波衰减
%K S波
%K 振幅层析成像
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=1E44AE713D8A6DE0&jid=14DC41C59CBF6770055A7D610D53AE46&aid=8CD9AEF5263BA4C1D0A079458943E832&yid=67289AFF6305E306&vid=987EDA49D8A7A635&iid=38B194292C032A66&sid=E0FF0FB27B45F84E&eid=9EB9AF946ABE60ED&journal_id=0001-5733&journal_name=地球物理学报&referenced_num=0&reference_num=40