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四川地震辐射能量和视应力的研究
引用本文:程万正,陈学忠,乔慧珍.四川地震辐射能量和视应力的研究[J].地球物理学进展,2006,21(3):692-699.
作者姓名:程万正  陈学忠  乔慧珍
作者单位:1. 四川省地震局预报研究所,四川,成都 610041; 2. 中国地震局地球物理研究所,北京 100081
基金项目:地震科学联合基金;国家重点基础研究发展计划(973计划)
摘    要:利用成都数字地震台网的波形记录资料,研究了四川地区地震辐射能量〖WTHX〗E〖WTBZ〗s、σapp视应力等震源参数及相互关系.对时域波形数字记录首先进行数据处理,包括带通滤波,快速富氏变换,扣除仪器幅频特性;经反变换,回到时间域,给出数字波形时间序列,选取所有方向的整个p波和s波段数据;二次变换到频率域内计算速度和地动位移的功率谱积分,进而求得各台站记录的地震波辐射能量和视应力等震源参数.研究了2000年5月到2004年8月成都数字地震台网记录的224个3级以上地震的震源参数.四川地区地震辐射能量〖WTHX〗E〖WTBZ〗s与地震矩M0,应力降Δσ与视应力σapp,视应力σapp与震级ML大体成正比.其中地震视应力σapp与震级分布数据较宽,地震视应力与破裂尺度ra的关系也较分散.同时研究了四川地区近年视应力σapp的空间分布.方法是将计算的σapp值在一定空间邻域内作平均,从而绘出等值线.分析结果表明,σapp值的相对高值区分布在四川南部的川滇交界和北部的川甘交界一带.同时研究了四川地区地震视应力值的时间分布.最后对中小地震视应力σapp及其他震源谱参数的意义作了讨论.

关 键 词:视应力  辐射能量  震源参数  四川
文章编号:1004-2903(2006)03-0692-08
收稿时间:2005-08-15
修稿时间:2005-12-20

Research on the radiated energy and apparent strain of the earthquakes in Sichuan province
CHENG Wan-zheng,CHEN Xue-zhong,QIAO Hui-zhen.Research on the radiated energy and apparent strain of the earthquakes in Sichuan province[J].Progress in Geophysics,2006,21(3):692-699.
Authors:CHENG Wan-zheng  CHEN Xue-zhong  QIAO Hui-zhen
Institution:1. Institute of Prediction, Earthquake Administration of Sichuan Province, Cheng du 610041, China ;2. Institute of Geophysics ,China Earthquake Administration, Beijing 100081, China
Abstract:Using the wave recorded by Chengdu digital seismic net, we studied the focus parameters of the earthquakes in Sichuan province, such as radiated energy 〖WTHX〗E〖WTBZ〗s, apparent strain σapp, etc and their mutual relationships. Firstly we pretreat the wave time series, including the bandpass channel filter of the wave data, FFT, getting rid of the amplitude-frequency characteristic of the viameter. Then carry out the IFFT returnning to the time domain, segmented selecting the whole data of p wave and s wave, at last carry out FFT once again to this selected data, segmented caculate the integral of the power spectral of the velocity and displacement in frequency domain, and go a step further we can get the focus parameters such as the radiated energy and the apparent strain etc.We selected 224 earthquakes recorded by Chengdu digital seismic net from 2000.5 to 2004.8. Their magnitude is not less than 3. From the focus parameters of the the 224 earthquakes, we can know the relationships between the radiated energy 〖WTHX〗E〖WTBZ〗s〖WTBZ〗 and the moment M0、the dropping stress Δσ and the apparent strain σapp、the apparent strain σapp and the magnitude ML almost are direct ratio.In which the distribution data of the apparent strain and the magnitude is relative broad, the data between the apparent strain and the rupturing scale is scattering. We also stuied the spatial distribution of the apparent strain of the earthquakes in Sichuan province rencent years. By averaging the apparent strain values in definite space, we drawed out the isoline of the apparent strain.The result indicates that the relative high apparen strain area is in the boundary between the Sichuan and Yunnan province, at the south of Sichuan province. Another high apparent strain area is in the boundary between the Sichuan and Gansu province, at the northern part of Si\|chuan province. Meanwhile we studied the temporal distribution of the apparent strain in Sichuan province. At last we discuss the significance of the apparent strain and other focus parameters of the medium\|small earthquakes.
Keywords:apparent strain  radiated energy  focus parameter  Sichuan
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