| 岫岩-海城Ms5.4地震序列震源机制解 |
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| 引用本文： | 张萍,谷光峪,高艳玲.岫岩-海城Ms5.4地震序列震源机制解[J].地震,2001,21(1):98-102. |
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| 作者姓名： | 张萍 谷光峪 高艳玲 |
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| 作者单位： | 1. 辽宁省地震局,
2. 中国地震局分析预报中心, |
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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 2 0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 NNE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
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| 关 键 词： | 地震序列 震源机制 震源应力场 岫岩－海城地震 余震 主震 震前 |
| 文章编号： | 1000-3274(2001)01-0098-05 |
Focal mechanism of Xiuyan-Haicheng(MS5. 4) earthquake sequence |
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| ZHANG Ping,GU Guang-yu,GAO Yan-ling.Focal mechanism of Xiuyan-Haicheng(MS5. 4) earthquake sequence[J].Earthquake,2001,21(1):98-102. |
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| Authors: | ZHANG Ping GU Guang-yu GAO Yan-ling |
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| Institution: | ZHANG Ping 1,GU Guang yu 1,GAO Yan ling 2 |
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| Abstract: | In this paper, the focal mechanisms of 20 earthquakes with ML≥4.0, includingthe foreshock, mainshock and aftershock of Xiuyan-Haicheng M = 5.4 earthquake are ob-tained by using the sign data of P wave first motion. The analysis shows that the principalcompressional stress axes P are mostly in the northeast-east direction and the extensional axesT in the north-northwest direction, both P and T dip angles less than 30° are nearly horizontal.The null axes N are mostly rather steep. The strike of the two nodal planes is along the north-northeast and northwest-west directions respectively and most Xiuyan-Haicheng earthquakesbelong to the strike slip type. Focal mechanisms of aftershocks are mostly similar to that of themainshock and result is relatively stable. Source stress field of the mainshock controls thestress field of aftershocks. |
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| Keywords: | Seismic sequence Focal mechanism Focal stress field Xiuyan Haicheng earthquakes |
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