2014年新疆于田MS7.3地震同震位移及位错反演研究

利用于田震中300 km范围内的1个GPS连续站和12个GPS流动站数据，解算得到了2014年新疆于田M_S7.3地震地表同震位移，并反演了发震断层滑动分布，探讨此次地震对周边断裂的影响.地表同震位移结果显示，GPS观测到的同震位移范围在平行发震断裂带的北东-南西向约210 km，垂直发震断裂带的北西-南东方向约为120 km，同震位移量大于10 mm的测站位于震中距约120 km以内；同震位移特征整体表现为北东-南西方向的左旋走滑和北西-南东方向的拉张特征，其中在北东-南西方向，I069测站位移最大，约为32.1 mm，在北西-南东方向，XJYT测站位移最大，约为28.1 mm；位错反演结果表明，最大滑动位于北纬36.05°，东经82.60°，位于深部约16.6 km，最大错动量为2.75 m，反演震级为M_W7.0，同震错动呈椭圆形分布，以左旋走滑为主并具有正倾滑分量，两者最大比值约为2.5：1，同震错动延伸至地表，并向北东方向延伸，总破裂长度约50 km，地表最大错动约1.0 m；同震水平位移场模拟结果显示贡嘎错断裂、康西瓦断裂和普鲁断裂等不同位置主应变特征具有差异性，这种差异特征是否影响断裂带以及周围区域的应力构造特征，值得关注.

Coseismic displacement and dislocation inversion of 2014 Yutian MS7.3 earthquake in Xinjiang

Based on the data of 1 GPS continuous station and 12 GPS campaign stations within 300 km of the epicenter of Yutian earthquake, the surface coseismic displacement of the 2014 Yutian M_S7.3 earthquake in Xinjiang is calculated, and the slip distribution of seismogenic faults is inversed, and the influence of the earthquake on the surrounding faults is discussed.The results of GPS surface coseismic displacement show:The coseismic displacements observed by GPS ranged about 210 km in the direction of parallel seismogenic fault zone (NE-SW) and 120 km in the direction of vertical seismogenic fault zone (NW-SE), and the stations with co-seismic displacements greater than 10 mm were located within about 120 km from the epicenter. The overall co-seismic displacement characteristics are left-lateral strike-slip in NE-SW and tensile in NW-SE.The maximum displacement of the I069 station is about 32.1 mm in NE-SW direction and the maximum displacement of the XJYT station is about 28.1 mm in NW-SE.The dislocation inversion results show that the maximum slip is located at 36.05°N, 82.60°E, about 16.6 km deep, the maximum slip is about 2.75 m, the inversion magnitude is M_W7.0, the coseismic dislocation is elliptical distribution, mainly left-handed strike slip and has a positive dip slip component, the maximum ratio is about 2.5:1, coseismic dislocation extends to the surface, and extends to the north-east direction, the total rupture length is about 50 km, and the maximum dislocation is about 1.0 m.The simulation results of the horizontal displacement field show that the principal strain characteristics of Gonggacuo fault, Kengxiwar fault and Pulu fault are different at different position.Whether the difference characteristics affect the stress structure characteristics of the fault zone and the surrounding area,which needs for attention.