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地震 ›› 2015, Vol. 35 ›› Issue (3): 66-75.

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郯庐断裂带鲁苏皖段构造应力场及分段特征研究

孙业君1,2, 黄耘1, 江昊琳1, 詹小艳1, 王俊1, 叶碧文1, 丁烨1   

  1. 1.江苏省地震局, 南京 210014;
    2.东南大学, 南京 211100
  • 收稿日期:2014-10-16 出版日期:2015-07-31 发布日期:2020-06-28
  • 作者简介:孙业君(1979-), 男, 吉林蛟河人, 助理研究员, 主要从事数字地震学与地震预测等研究。
  • 基金资助:
    中国地震局地震科技星火计划项目XH15020Y); 江苏省科技支撑—社会发展项目(BE2011814); 中国地震局震情跟踪项目(2014020122); 江苏省地震局青年基金重点项目(201402)联合资助

Tectonic Stress Field and Segmention Characteristics in the Shandong—Jiangsu—Anhui Segment of the Tancheng—Lujiang Fault Zone

SUN Ye-jun1,2, HUANG Yun1, JIANG Hao-lin1, ZHAN Xiao-yan1, WANG Jun1, YE Bi-wen1, DING Ye1   

  1. 1. Earthquake Administration of Jiangsu Province, Nanjing 210014, China;
    2. Southeast University, Nanjing 211100, China
  • Received:2014-10-16 Online:2015-07-31 Published:2020-06-28

摘要: 利用Snoke方法求解和收集得到的77次中小地震的震源机制解资料, 采用Gephart应力张量反演方法, 获得了郯庐断裂带鲁苏皖段构造应力场, 最大主压应力方位角为80°, 最小主压应力方位角为172°, 最大、 中等和最小主压应力倾角分别为15°、 65°和19°, 反映了研究区处于近EW向水平作用和近NS向的水平拉张作用环境下。 根据地震活动、 地质构造及震源机制解差异, 我们将郯庐断裂带鲁苏皖段分5个区段开展研究, 结果显示: 5个分区应力场存在局部差异, 最大主压应力方位角处于63°~88°之间, 从北往南总体方向成顺时针偏转的趋势。 跨郯庐断裂带两侧的应力场研究结果显示, 从西到东最大主压应力方向有一个逆时针偏转的趋势, 西侧最大主压应力方向更接近EW向, 东侧更接近NE向, 郯庐断裂带内处于两侧的过渡地段。

关键词: 郯庐断裂带鲁苏皖段, 震源机制解, 构造应力场

Abstract: On the basis of the obtained focal mechanism solutions of 77 small and moderate earthquakes with the Snoke method, we used Gephart stress tensor inversion method to obtain the characteristics of tectonic stress field of the Shandong—Jiangsu—Anhui segment of the Tancheng—Lujiang Fault zone. The results show that the maximum and minimum principal compressive stress orientation angles are 80°and 172° respectively. Besides, the maximum, medium and minimum principal compressive stress dip angles are 15°, 65°and 19° respectively, which reflect that the study area is under the circumstance of horizontal action in EW and horizontal tensile action in NS. According to seismic activity, geological structure and the difference of focal mechanism solutions, we divided the Shandong—Jiangsu—Anhui segment of Tancheng—Lujiang Fault zone into 5 parts, and the study result indicates that there is local difference in stress among the 5 parts, the maximum principal compressive stress orientation angle is in the range of 63°~88°, and there is a deflection trend in the clockwise direction from north to south overall. The result of study on stress field along the both sides of the Tancheng—Lujiang Fault zone shows, that the maximum principle stress direction existes a deflection trend in counter-clockwise direction from west to east, which is closer to EW on the west side and closer to NW on the east side, and the Tancheng—Lujiang Fault zone is in the transition area between the two sides.

Key words: Tectonic stress field, Focal mechanism solution, Shandong—Jiangsu—Anhui segment of Tancheng—Lujiang Fault zone

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