| 海城、盖州地区地震震源机制及一致性参数特征研究 |
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| 引用本文： | 段梦乔,赵翠萍.海城、盖州地区地震震源机制及一致性参数特征研究[J].地震,2019,39(4):39-53. |
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| 作者姓名： | 段梦乔 赵翠萍 |
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| 作者单位： | 中国地震局地震预测研究所,北京100036;辽宁省地震局,辽宁沈阳 110031;中国地震局地震预测研究所,北京,100036 |
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| 基金项目： | 辽宁省地震局青年科研基金(LN201813); 中国地震局地震预测研究所基本科研业务专项(2018IEF010202)资助 |
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| 摘 要： | 本文选取辽宁海城、 盖州地区(40°~41°N, 122°~123°E)作为研究区, 利用广义极性振幅技术(GPAT)方法, 反演得到研究区2012—2017年6月共184个地震震源机制解, 并利用Misfit角度分析震源机制一致性参数特征。 研究结果表明: ① 研究区地震震源机制解以走滑型和正断型为主。 海城地区地震震源机制解以NW—SE向节面的左旋走滑型和NWW向节面的正断型为主。 发震构造以NW向海城河断裂为主, NE向节面为主的地震可能受到NE向金州断裂带的控制。 ② 青石岭地区的发震构造为与九寨—盖县北段共轭的NW向未知断裂, 西海域的地震活动可能是NE向的雁式断裂和NW向共轭的未知断裂共同作用的结果。 ③ 震源机制一致性结果显示, 一致性增强后发生了震级相对较大的地震。 研究区的震源机制一致性较强, 表明该区域的应力较为集中。 但由于2016年以来活动趋于平静, 尚难以根据震源机制解一致性程度做出当前应力状态的判断。
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| 关 键 词： | 震源机制 震源深度 震源机制一致性 海城、盖州地区 |
| 收稿时间： | 2019-04-03 |
The Reasearch on Characteristcs of Focal Mechanisms and Consistency Parameters in Haicheng and Gaizhou Area |
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| DUAN Meng-qiao,ZHAO Cui-ping.The Reasearch on Characteristcs of Focal Mechanisms and Consistency Parameters in Haicheng and Gaizhou Area[J].Earthquake,2019,39(4):39-53. |
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| Authors: | DUAN Meng-qiao ZHAO Cui-ping |
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| Institution: | 1.Institude of Earthquke Forecasting, CEA, Beijing 100036, China;
2.Earthquake Administration of Liaoning Province, Shenyang 110031, China |
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| Abstract: | We select Haicheng-Gaizhou area (122°~123°E, 40°~41°N)in Liaoning province as study area and use Generalized Polarity and Amplitude Technique-GPAT to inverse and get 184 focal mechanism solutions from 2012 to June 2017. Then we use the Misfit Angle to analyze characteristic of focal mechanism consistency parameters. The inversion results show that: ① The strike-slip faulting and normal faulting are dominant in the study area. The focal mechanisms in Haicheng are mainly sinistral strike-slip faulting with NW—SE nodal planes and normal faulting with NWW nodal planes. The seismogenic structure is dominated by NW Haicheng River fault. The earthquakes with NE oriented nodal plane may be controlled by Jinzhou fault zone. ② The seismogenic structure in Qingshiling is a NW-trending unknown fault conjugated with the north section of Jiuzhai—Gaixian fault, and seismicity in West sea area may be contolled by NE-trending en-echelon faults and the NW-trending unknown fault. ③ The earthquakes with larger magnitude often occurred after consistency enhancement. The focal mechanisms have strong consistency, indicating that stress is building up in the study area. However, due to the quiet seismicity since 2016, it′s difficult to estimate the stress state at present. |
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| Keywords: | Haicheng-Gaizhou area Focal mechanisms Focal depths Focal mechanisms consistency parameters |
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