| 地震视应力及其物理意义的探讨 |
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| 引用本文： | 盛书中,万永革.地震视应力及其物理意义的探讨[J].地震地磁观测与研究,2008,29(1):36-43. |
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| 作者姓名： | 盛书中 万永革 |
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| 作者单位： | 1. 中国北京,100081,中国地震局地球物理研究所
2. 中国北京,100081,中国地震局地球物理研究所;中国河北三河,065201,防灾科技学院 |
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| 基金项目： | 地震科学联合基金
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中国地震局地球物理研究所论著资助项目 |
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| 摘 要： | 对NEIC宽频带地震辐射能量目录和哈佛CMT目录，给出全球震级大于5．5级的有能量记录的地震资料进行统计研究。首先，拟合得到全球浅源地震和不同类型地震平均视应力的大小和范围，验证了前人得到的“走滑型视应力大于倾滑型视应力”的结论；其次，对折合能量和地震矩关系分析得到：正断层型地震的折合能量随着地震矩增大而减小，而对于走滑型和逆冲型地震未得到前人给出的明确结论；对主震视应力和余震视应力的分析比较表明，它们在量值上没有规律性，必须要结合实际的地震事件，才能反映出它们之间大小关系的真正物理内涵，因为不同的主震可能对震源区的应力场有不同的影响——造成震源区应力场的应力集中（障碍体模式），大部分余震的视应力高于主震视应力；或使应力场更加均匀（凹凸体模式），大部分余震视应力低于主震视应力。这些结论对地震震源理论研究具有一定意义。
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| 关 键 词： | 视应力 辐射能量 地震矩 折合能量 主震 |
| 文章编号： | 1003-3246(2008)01-0036-08 |
| 修稿时间： | 2007年8月6日 |
Apparent stress and the discussion of its physical implication |
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| Sheng Shuzhong,Wan Yongge.Apparent stress and the discussion of its physical implication[J].Seismological and Geomagnetic Observation and Research,2008,29(1):36-43. |
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| Authors: | Sheng Shuzhong Wan Yongge |
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| Institution: | Sheng Shuzhong,Wan Yongge(1.Institute of Geophysics, China Earthquake Administration, Beijing 100081, China;2.Institute of Disaster Prevention Science and Technology, Sanhe 065201, China) |
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| Abstract: | We get the earthquakes from NEIC broadband radiated energy catalogue and the Harvard CMT catalogue which have radiated energy and magnitude great than 5.5, and studied them statistically. Firstly, we get the average apparent stress and its range of global shallow events and the different types of earthquake by liner regression fitting, and validated the predecessors＇ conclusion that the apparent stress of strike-slip earthquake great than that of dip-slip earthquake. Secondly, comparison between the reduced energy and seismic moment, and derived that： for normal events, the apparent stress increases with the seismic moment, but didn＇t get the clear conclusion as predecessor for thrust and strike-slip events. Thirdly, there seems no regularity between the value of main shock apparent stress and that of their after-shocks, but their relationship can reflect some physical meaning by combine the exact event, different main shock may acted differently to the source region--leading the stress concen- tration of source region （barrier model）, and most of the apparent stress of aftershocks is higher than that of main shock, or arousing the stress of source region to be more homogeneous（asperity model）, and apparent stress of main shock higher than that of most after-shocks. These conclusions may have some significance to the study of source theory. |
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| Keywords: | apparent stress radiated energy seismic moment reduced energy main shock |
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