| 2016年10月20日射阳MS4.4地震的震源机制与地震序列的时空分布特征 |
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| 引用本文： | 李锋,李迎春,李强,冯志生,王俊菲.2016年10月20日射阳MS4.4地震的震源机制与地震序列的时空分布特征[J].地震学报,2017,39(5):659-668. |
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| 作者姓名： | 李锋 李迎春 李强 冯志生 王俊菲 |
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| 作者单位： | 1.中国南京 210014 江苏省地震局 |
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| 基金项目： | 江苏省社会发展项目BE2010751江苏省自然科学基金BK20131033中国地震局监测预报司震情跟踪定向工作任务2016010124江苏省地震局青年科学基金201508QY江苏省自然科学基金(BK20131033)、江苏省社会发展项目(BE2010751)、中国地震局监测预报司震情跟踪定向工作任务(2016010124)和江苏省地震局青年科学基金(201508QY)共同资助 |
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| 摘 要： | 基于江苏地区测震台网记录，采用CAP方法反演了2016年10月20日射阳MS4.4地震的震源机制解和震源深度；利用HypoDD方法对射阳地震序列中ML≥1.5地震进行了重新定位.结果显示:射阳MS4.4地震的震源机制参数分别为节面Ⅰ:走向304°，倾角53°，滑动角0°；节面Ⅱ:走向214°，倾角90°，滑动角143°，震源深度约为14 km.双差定位结果显示:此次射阳地震序列分布于洪泽—沟墩断裂与盐城—南洋岸断裂之间，在水平空间内，其震中分布的优势方向为NW60°，由SE向NW迁移; 地震序列深度分布在6—23 km范围内.根据所反演的震源机制参数和地震序列精定位结果，本文推测射阳MS4.4地震的断层面解为震源机制解的节面Ⅰ, 该地震可能是在区域背景应力场的作用下，沿NW向剪切破裂产生的左旋走滑地震事件.
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| 关 键 词： | 射阳MS4.4地震 震源机制 双差定位 库伦-摩尔破裂准则 |
| 收稿时间： | 2016-12-05 |
Focal mechanism of the Sheyang MS4.4 earthquake on October 20, 2016 and the spatio-temporal distribution of the earthquake sequence |
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| Institution: | 1.Earthquake Administration of Jiangsu Province, Nanjing 210014, China2.Earthquake Administration of Fujian Province, Fuzhou 350003, China |
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| Abstract: | Based on the digital waveforms of Jiangsu seismic network, the focal mechanism of the Sheyang MS4.4 earthquake was determined by using the CAP (cut and paste) method, and the ML≥1.5 events of Sheyang earthquake sequence were relocated by using the HypoDD method. The result shows that the strike, dip and rake of the MS4.4 event are 304°, 53°, 0° for the nodal plane Ⅰ, and 214°, 90°, 143° for the nodal plane Ⅱ, respectively, and the centroid depth is about 14 km. The relocation for the Sheyang earthquake sequence shows that the earthquake sequence was located between Hongze-Goudun fault and Yancheng-Nanyang'an fault with the predominant direction NW60° in horizontal space, and the sequence propagated from southeast to northwest with the focal depth of 6--23 km. According to the focal mechanism solutions and the relocation results, we deduce that the Sheyang MS4.4 earthquake is a left-lateral slip event induced by shear rupture northwestwards under regional stress field, and its fault plane is nodal plane Ⅰ. |
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