东亚地震活动的时空分布及其与区域应力场的关系
SPATIOTEMPORAL DISTRIBUTION OF SEISMIC ACTIVITY IN EAST ASIA AND ITS RELATION TO REGIONAL STRESS FIELD
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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.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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[1] 石川有三, 1986东アジアのテケトニケス地震学会讲演予稿集, No.2. A35 ,35
[2] Xu, J. R. . Zhao, Z. X. , Ishikawa Y. and Oike , K 1988. Properties of the stress field in and around West China——Derived from earthquake mechanism solutions. Bulletin the Disaster Prevention Research Gnsuitute,Kyoto University.38,Part 2,49——78.
[3] Oikc. K.and Huzita,K..1988.Relation between characteristics of seismic activity and neotectonics in Hosou, Japan. Tc"ctunoP协, .s;r.s, 148,115——130
[4] 藤田和夫、尾池和夫, 1981.本州弧の活构造と地震活勤.科学, 51, 704——711.
[5] 赵志新、松村一男、尾池和夫、石川有三, 1988, 东アジアに地震活动变化の地域的特征と关联性につて(3)中国西部と邻接地域.地震, 第2辑, 第41卷. 389——400.
[6] Ichikawa. M., 1965.The mechanism of earthquake occurring in Central and Southwestern Japan and some related problems. Papers Metcornl. Geophys.,16, 104——156.
[7] Mogi, K. , 1974.Active periods in the world's chief seismic belts. Tectonophysis, 22, 265——282[1] 石川有三, 1986东アジアのテケトニケス地震学会讲演予稿集, No.2. A35 ,35
[2] Xu, J. R. . Zhao, Z. X. , Ishikawa Y. and Oike , K 1988. Properties of the stress field in and around West China——Derived from earthquake mechanism solutions. Bulletin the Disaster Prevention Research Gnsuitute,Kyoto University.38,Part 2,49——78.
[3] Oikc. K.and Huzita,K..1988.Relation between characteristics of seismic activity and neotectonics in Hosou, Japan. Tc"ctunoP协, .s;r.s, 148,115——130
[4] 藤田和夫、尾池和夫, 1981.本州弧の活构造と地震活勤.科学, 51, 704——711.
[5] 赵志新、松村一男、尾池和夫、石川有三, 1988, 东アジアに地震活动变化の地域的特征と关联性につて(3)中国西部と邻接地域.地震, 第2辑, 第41卷. 389——400.
[6] Ichikawa. M., 1965.The mechanism of earthquake occurring in Central and Southwestern Japan and some related problems. Papers Metcornl. Geophys.,16, 104——156.
[7] Mogi, K. , 1974.Active periods in the world's chief seismic belts. Tectonophysis, 22, 265——282
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