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利用中国地震科学台阵探测项目中部分台站和青海、甘肃地震台网的观测资料,选取最佳速度模型,利用逆时成像技术对2016年1月21日青海门源M_S6.4地震的起始破裂点和震源中心进行成像分析.结果表明:门源地震的发震时刻为北京时间2016年1月21日1时13分11s,起始破裂点位于(37.67°N,101.61°E),震源深度为9.41km;震源中心的位置变迁可以分为1—6s和7—10s两个阶段,且均基本位于倾角约75°、倾向NE的斜面附近.根据震源中心的迁移特征,推测走向为335°,倾角为56°,滑动角为97°的节面为门源地震的破裂面.结合该地震滑动角较大及高倾角逆冲构造的活动特征,认为门源MS6.4地震应为冷龙岭北侧高倾角次级逆断层活动的结果.
Based on the observation data of some stations in the China Earthquake Science Array Exploration Project and the seismological stations in Qinghai and Gansu, the best velocity model was selected and the reverse-time imaging technique was used to predict the M_S6.4 earthquake on January 21, 2016 in Qinghai Province The initial rupture point and the focal center were analyzed.The results show that the onset time of the Menyuan earthquake is 1: 13-11: 11 on January 21, 2016, and the initial rupture point is at (37.67 ° N, 101.61 ° E) The focal depth is 9.41km. The center of the focal position can be divided into two stages of 1-6s and 7-10s, all of which are basically located at an inclination of about 75 ° and inclined to the slope of NE.According to the migratory characteristics of the focal center, 335 °, dip angle of 56 °, and sliding angle of 97 ° are the ruptured faces of the portal source earthquake.Combining with the characteristics of the larger seismic slip angle and high-dip thrust structures, it is considered that the MS6.4 earthquake in the source should be The results of the high dip dip fault activity on the north side of Lenglongling.