| 赣南地区小震震源机制分析 |
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| 引用本文： | 曾文敬,罗丽,项月文,卢福水,李超.赣南地区小震震源机制分析[J].华南地震,2010,30(1):92-98. |
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| 作者姓名： | 曾文敬 罗丽 项月文 卢福水 李超 |
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| 作者单位： | 江西省地震局,江西,南昌,330039 |
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| 摘 要： | 利用从震源向上射出的直达P、S波引起的地动位移振幅比求解震源机制,得到赣南及近邻地区58个ML2.0~4.2地震的震源机制解。对震源机制解P、T轴参数进行l0°间隔归一频数分析,得到如下结论:①本区地震断层以走滑型为主;②震源机制P轴方位主要分布在270°～330°间,平均方位为287°,P轴倾俯角以小于30°的近水平优势分布,这一结果与区域NWW-SEE水平挤压为特征的构造应力场相吻合。
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| 关 键 词： | 震源机制解 赣南地区 |
Analysis on the Focal Mechanism of Small Earthquakes in The Southern Area of Jiangxi |
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| ZENG Wenjing,LUO li,XIANG Yuewen,LU Fushui,LI Chao.Analysis on the Focal Mechanism of Small Earthquakes in The Southern Area of Jiangxi[J].South China Journal of Seismology,2010,30(1):92-98. |
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| Authors: | ZENG Wenjing LUO li XIANG Yuewen LU Fushui LI Chao |
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| Institution: | (Earthquake Administration of Jiangxi Provincei, Nanchang 330039, China) |
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| Abstract: | Based on the amplitude ratios of ground displacement caused by upward direct wave P and S from focal, focal mechanism solutions of 58 ML2.0-4.0 earthquakes in the Southern Area of Jiangxi province and its adjacent areas are calculated. On the basis of analysis by 10° interval normalizational frequence on the parameters of P-axis and T-axis of these focal mechanism solutions, we draw two conclusions： 1 ） the earthquake faults in this area are mainly strike-slip faults; 2） the P-axis orientation are mainly distributed from 270° to 330°,its averaged orientation is 287°, and the P-axis elevation angles are nearly horizontal distribution. The results are consistent with the regional NWW-SEE horizontal compressional tectonic stress field. |
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| Keywords: | Focal mechanism solutions The southern area of Jiangxi |
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