| 中国大陆主要地震活动区中小地震震源参数研究 |
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| 引用本文： | 赵翠萍,陈章立,华卫,王勤彩,李志雄,郑斯华.中国大陆主要地震活动区中小地震震源参数研究[J].地球物理学报,2011,54(6):1478-1489. |
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| 作者姓名： | 赵翠萍 陈章立 华卫 王勤彩 李志雄 郑斯华 |
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| 作者单位： | 1. 中国地震局地震预测研究所,北京 100036;
2. 中国地震局,北京 100036 |
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| 基金项目： | 中国地震局行业基金专项，国家科技支撑重点项目 |
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| 摘 要： | 本文利用中国大陆几个主要地震活动区近几年积累的大量ML≥2.5数字地震观测记录,在分别反演得到13个不同构造研究区域的介质衰减模型、348个台站的场地效应的基础上,自0.1～20 Hz的SH观测波形数据中逐步消除了仪器、噪声、几何扩散、传播路径的介质衰减、台站场地效应等影响后,恢复了2573次3.0≤ML≤6.0地震的...
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| 关 键 词： | 震源谱 震源参数 应力降 介质衰减 场地效应 |
| 收稿时间： | 2011-02-12 |
Study on source parameters of small to moderate earthquakes in the main seismic active regions, China mainland |
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| ZHAO Cui-Ping,CHEN Zhang-Li,HUA Wei,WANG Qin-Cai,LI Zhi-Xiong,ZHENG Si-Hua.Study on source parameters of small to moderate earthquakes in the main seismic active regions, China mainland[J].Chinese Journal of Geophysics,2011,54(6):1478-1489. |
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| Authors: | ZHAO Cui-Ping CHEN Zhang-Li HUA Wei WANG Qin-Cai LI Zhi-Xiong ZHENG Si-Hua |
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| Institution: | 1. Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China;
2. China Earthquake Administration, Beijing 100036, China |
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| Abstract: | On the basis of both the frequency dependent Q(f) model for 13 regions and the site response for 348 stations were inversed firstly by using different inversion methods, source displacement spectra of about 2573 events of 3.0≤ML≤6.0 from 2001 to 2010, occurred in main seismic active regions of the mainland china, are restored after the influences of instrument, noise, geometry spreading, anelastic attenuation, as well as the site contributions were corrected from SH components of the observed seismic waves. The source parameters of 2573 events are further estimated assuming a Brune-type source model. Our results demonstrate that the estimated stress drops range from 0.1 MPa to 20 MPa with most less than 10 MPa. The stress drops of events occurred in the middle and east part of Tianshan, Xinjiang, China, the east-northern boundary of Tibet, and the east-northern segment of Longmenshan fault zone, are relatively larger, implying that they may experience relatively stronger shear stress. We find that stress drops increase with earthquake magnitudes, satisfying a relationship of Δσ∝M03.14, not a constant model. We don't find a dependence of stress drop on focal depth within 20 km, while there is a minor increasing trend with depth increasing when deeper than 20 km. We don't find a dependence of stress drop on focal mechanism. Through this work, we realized the near real time calculation of source parameters for an individual event, and our results provide a large amount of samples for studying the scaling relationship in the mainland. We can prospect that with the calculation and accumulation of source parameters, the spatial and temporal characteristics of these parameters, which has certain physical meanings, will make contribution to earthquake forecasting research. In addition, the obtained attenuation model and site effects will help in determining the calibration function and station corrections, which are two important factors for the purpose of precisely estimating the local ML magnitude. |
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| Keywords: | Source displacement spectrum Source parameters Stress drop Attenuation Site effects |
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