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利用互相关函数求地震波衰减
引用本文:徐平,王宝善,张尉,林建民,陈颙.利用互相关函数求地震波衰减[J].地球物理学报,2006,49(6):1738-1744.
作者姓名:徐平  王宝善  张尉  林建民  陈颙
作者单位:1.中国科学院地质与地球物理研究所,北京 100029 2 中国地震局地球物理研究所,北京 100081 3 浙江大学地球科学系,杭州 310027 4 中国科学技术大学地球和空间科学学院,合肥 230026 5 北京市地震局,北京 100080
基金项目:国家自然科学基金,地震科学联合基金,北京市科技攻关计划
摘    要:与传统利用单事件波形求介质衰减的方法不同,我们提出一种以一系列事件为源,以源与远处记录波形的互相关函数为基础计算介质品质因子的方法.依据野外现场实验的数据,我们分别以单次和多次激发为源,讨论了事件波形和互相关函数波形的振幅变化及相应的介质品质因子,结果发现,与事件波形一样,互相关函数波形也可以用于计算介质的衰减系数.计算结果表明:(1)实验场地浅层介质在原场条件下的品质因子Q值在40左右;(2)互相关函数的最大幅度与事件波形的振幅随距离具有相同的衰减规律.

关 键 词:地震波衰减  频谱比  互相关函数  Q值  
文章编号:0001-5733(2006)06-1738-07
收稿时间:2006-03-09
修稿时间:2006-03-092006-05-11

Estimating seismic attenuation using cross-correlation function
XU Ping,WANG Bao-Shan,ZHANG Wei,LIN Jian-Min,CHEN Yong.Estimating seismic attenuation using cross-correlation function[J].Chinese Journal of Geophysics,2006,49(6):1738-1744.
Authors:XU Ping  WANG Bao-Shan  ZHANG Wei  LIN Jian-Min  CHEN Yong
Institution:1.Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 2 Institute of Geophysics, China Earthquake Administration, Beijing 100081, China 3 Department of Earth Science of Zhejiang University, Hangzhou 310027, China 4 School of Earth and Space Science, University of Science and Technology of China, Hefei 230026, China 5 Earthquake Administration of Beijing Municipality, Beijing 100080, China
Abstract:Different from the traditional method of estimating seismic attenuation based on the waveform of single event,we regarded a series of events as an equivalent one,and obtained seismic attenuation on the basis of cross-correlation function between source and signal recorded at distance.We performed a field experiment by the end of 2004,and based on the data of this experiment,we studied the amplitude degression and corresponding seismic attenuation factor of both single event waveform and cross-correlation function.It is found that,same as single event waveform,cross-correlation function could be used to assess the seismic attenuation.The results show:(1) Q of in-situ medium is about 40;(2) Amplitude degressions with distance of single event waveform and cross-correlation functions are much similar.
Keywords:Seismic attenuation  Spectral ratio  Cross-correlation function  Q value
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