| 唐山余震震源参数和衰减的联合反演 |
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| 引用本文： | 孙勇,郑斯华.唐山余震震源参数和衰减的联合反演[J].地震学报,1991,13(4):422-429. |
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| 作者姓名： | 孙勇 郑斯华 |
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| 作者单位： | 1. 中国沈阳 110031 辽宁省地震局
2. 中国北京 100036 国家地震局分析预报中心 |
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| 摘 要： | 利用唐山余震的数字化地震记录,研究了唐山余震的震源参数.发展了一种 P 波谱的反演方法,以消除用波谱分析求解震源参数过程中的不确定因素的影响.经过数值实验和对实际资料的应用,初步证明了这种方法的实用性.利用5个台站接收的35次地震记录的 P 波频谱资料,反演了唐山滦县地区的震源动力学参数,得到了5个台站的 P 波 Q 值和震源频谱的高频衰减率.Q 值分布在408——847之间,均值为520;值分布在1.54——3.22之间,均值为2.41.在该区域的小震频谱的定标律研究中,发现应力降随地震矩的增加而增加.
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| 关 键 词： | 震源参数 衰减 定标律 |
INVERSION OF SOURCE PARAMETERS AND ATTENUATION OF THE TANGSHAN AFTERSHOCKS |
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| Institution: | 1. Seismological Bureau of Liaoning Province, Shenyang 110031 China;
2. Center for Analysis and Prediction, State Seismological Bureau, Beijing 100036, China |
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| Abstract: | Source parameters and characteristics of regional attenuation of Tangshan aftershocks are studied by using digital records of Tangshan aftershocks. An inversion method of P wave spectra to reduce influence on the ambiguity in the estimates of parameters by the usual spectrum analysis method is developed. By testing with artificial data and applying to real data, it is confirmed that the method is usable.Dynamic parameters of the Tangshan Luanxian area are obtained by using records of 35 earthquakes at 5 stations. P wave Q values and high frequency decay rate y of source spectrum at 5 stations are also obtained. The Q values range from 408 to 847, and the mean value is 520; while y ranges from 1.54 to 3.22 and the mean value is 2.41.In the studies of spectra of the microearthquakes in the Luanxian area, that the stress drop increases with increasing earthquake moment is found. |
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