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2016年1月21日,青海省门源县冷龙岭断裂带附近发生了M_W5.9地震。基于Sentinel-1A影像,采用差分干涉雷达测量技术研究了此次地震产生的同震形变场,结果表明,门源地震的形变影响范围约20~30km,形变态势在升降轨道形变场均显示为隆升,基本沿冷龙岭断裂呈近似同心圆展布,推测可能是冷龙岭断裂与民乐—大马营断裂之间的一条逆断层,沿雷达视线方向最大形变量级约为6cm。均匀滑动反演显示门源发震断层长7.3km,宽6.2km,走向298.6°,倾角34.5°,倾向宽度9.5km,沿走向滑动量为170mm,沿倾向滑动量为460mm,矩震级为M_W5.97;分布式滑动反演显示门源地震以逆冲为主,兼具少量右旋走滑分量,滑动量主要集中在沿断层倾向方向,距离地表5~15km处,最大滑动量约0.3m,位于断层倾向深度10km处,矩震级为M_W5.93。
On January 21, 2016, an M_W5.9 earthquake near the Lenglongling fault zone, Mengyuan County, Qinghai Province occurred. Based on the Sentinel-1A image, the coherent deformation field generated by the earthquake was studied by using the differential interference radar measurement technique. The results show that the deformation range of the source earthquake is about 20 ~ 30km, and the deformation trend shows as Long It is basically a concentric circle along the Lenglongling fault, suggesting that it may be an inverse fault between the Lenglongling fault and the Minle-Damaying fault. The maximum deformation order along the radar line of sight is about 6cm. Uniform sliding inversion shows that the seismogenic fault of the gate source has a length of 7.3km, a width of 6.2km, a strike of 298.6 °, a dip angle of 34.5 °, a dip width of 9.5km, a sliding amount of 170mm along the strike, a sliding amount of 460mm along the dip, and a moment magnitude M_W5. 97; distributed sliding inversion shows that the source-sourced earthquake mainly consists of thrust and a small amount of dextral strike-slip component. The slip amount mainly concentrates in the direction of fault orientation and the maximum slip is about 0.3m away from the surface at 5 ~ 15km. It is located at a depth of 10km and has a moment magnitude of M_W5.93.