| 东亚地震活动的时空分布及其与区域应力场的关系 |
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| 引用本文： | 徐纪人,赵志新.东亚地震活动的时空分布及其与区域应力场的关系[J].地震学报,1991,13(3):287-294. |
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| 作者姓名： | 徐纪人 赵志新 |
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| 作者单位： | 1. 中国 兰州 730000 国家地震局兰州地震研究所
2. 中国 北京 100081 国家地震局地球物理研究所
3. 日本 京都 606 京都大学理学部地球物理教室 |
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| 摘 要： | 来自板块之间相对运动的构造力可以传递到大陆地壳,从而形成了大陆内部的地震应力场.在某一地区,包括小地震在内的地震活动性的分布可以反映该地区的应力场的变化.根据这一观点,本文根据大量的震源机制解的结果以及最近500年的地震活动资料,详细地研究了东亚地区内几个地区的区域应力场的特征.其结果表明,来自太平洋板块相对欧亚板块的俯冲所形成的构造力,控制了从华北地区到南北地震带北段的应力场.本文根据小震的地震活动变化的特征,讨论了日本一部分地区由地震活动性的变化所反映的区域应力场的变化.中国西部以及印度-澳大利亚和欧亚大陆板块边界地区,最近大约100年地震活动性的同步变化表明,来自印度-澳大利亚板块和欧亚板块碰撞所产生的构造力,传递到了中国西部.印度-澳大利亚板块和欧亚大陆板块边界,以及中国西部的地震活动,现在依然处在地震活动高潮期.
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| 关 键 词： | 地震活动性 孕震力 区域应力场 构造力 板块相对运动 |
SPATIOTEMPORAL DISTRIBUTION OF SEISMIC ACTIVITY IN EAST ASIA AND ITS RELATION TO REGIONAL STRESS FIELD |
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| Affiliation: | 1. Lanzhou Earthquake Research Institute State Seismological Bureau Lanzhou 730000, China;
2. Institute of Geophysics State Seismologicul Bureau Beijing 100081 China;
3. Geophysical Institute Faculty of Science Kyoto University Kyoto 606 Japan |
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| Abstract: | Tectonic forces from the relative movements between plates are transmitted into the continental crust, and then they create the earthquake generating stress field there. The space - time distribution of the seismic activity including the small earthquakes in a region reflects the variation of the stress field in the region.According to this idea, the characteristics of the stress fields in the various regions of East Asia have been analyzed in detail in this paper based on a lot of solutions of focal mechanisms and data of seismic activity during the last 500 years. The results indicate that the tectonic forces from the subduction of the Pacific Ocean plate underneath the Eurasian plate control the stress field in the region from North China to the northern part of the North- South Seismic Belt.The variation of the regional stress field shown by the variation of seismic activity in some regions of Japan has also been discussed based on characteristics of variation of the seismicity of small earthquakes.Synchronous variations of seismicity in the past 100 years or so in West China and in the boundary region between the Indo - Australian and Eurasian plates implicate that there is the transmission of tectonic forces into West China through the collision between the Indo - Australian and Eurasian plates. The active seismic activity in the boundary region between the Indo - Australian and the Eurasian plates and in West China is continuing consistently. |
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