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地震 ›› 2001, Vol. 21 ›› Issue (1): 98-102.

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岫岩-海城 MS5.4地震序列震源机制解*

张萍1, 谷光峪1, 高艳玲2   

  1. 1.辽宁省地震局,辽宁沈阳 110031;
    2.中国地震局分析预报中心,北京 100036
  • 出版日期:2001-01-31 发布日期:2022-10-27
  • 作者简介:张萍(1957-),女,辽宁辽阳人,高级工程师,主要从事数字台网编目等研究。

Focal mechanism of Xiuyan-Haicheng(MS 5.4)earthquake sequence

ZHANG Ping1, GU Guang-yu1, GAO Yan-ling2   

  1. 1. Seismological Bureau of Liaoning Province, Shenyang 110031, China;
    2. Center for Analysis and Prediction, Beijing 100036, China
  • Online:2001-01-31 Published:2022-10-27

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摘要： 应用 P波初动符号资料,求解得到了岫岩-海城5.4级地震前、主、余震20个ML ≥ 4.0的震源机制解。分析表明,该地区的主压应力轴(P) 大多为NEE-SWW向,主张应力轴(T) 大多为NNW-SSE向, P、T轴仰角基本上小于30°,表明力轴以水平者最多。N轴大多较陡。A、B节面的走向分别为NWW向和NN E向。岫岩-海城地震主要为走滑断层类型。余震震源机制解绝大多数与主震相近,结果比较稳定,表明余震的应力场主要受主震震源应力场的控制。

关键词: 地震序列, 震源机制, 震源应力场, 岫岩-海城地震

Abstract: In this paper, the focal mechanisms of 20 earthquakes with ML ≥ 4.0, including the fo reshock, mainshock a nd af tershock of Xiuya n-Haicheng M = 5.4 ea rthquake are obtained by using th e sign data of P wavefi rst mo tion. The analysis shows that the principal compressional st ress axes P a re mo stly in the no rtheast-east di rection and the extension nal axes Tin the north-nor thw est di rection, both P and T dipang les less than 30°are nearly ho ri zo ntal. The null axes N are most ly rather steep. The st rike of the two no dal planes i s a long the north-no rtheast and nor thw est-west directions respectively and most Xiuya n-Haicheng ea rthquakes belo ng to the strike slip type. Focal mechani sms of aftershocks are most ly similar to that of the mainshock and result is relatively stable. Source stress field of the mainshock cont rols the stress field ofaf tershocks.

Key words: Seismic sequence, Focal mechanism, Focal stress field, Xiuyan-Haicheng earthquakes

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