2013年岷县漳县6.6级地震同震位移及震中区现今地壳形变特征研究

利用中国大陆构造环境监测网络在甘肃省及周边区域的GPS观测资料, 通过高精度数据处理, 获得基准站的位移时间序列, 给出该区域现今地壳形变特征, 并计算得到2013年甘肃岷县漳县6.6级地震同震位移。 结果表明: 该区域的陆态网络连续站中, 只有GSMX站观测到了较为明显的水平同震位移, 大小约18.7 mm, 由此推断此次地震的影响范围在距离震中30～50 km以内。 研究区内的地壳水平运动较活跃, 同时具有一定的规律性和连续性, 西部的运动速率高于东部, 东南区域的运动速率较小, 最小值为4.4 mm/a, 西南运动速率较大, 最大值为18.4 mm/a。 GPS连续应变率结果显示, 研究区存在近NE—SW向的压缩应变, 近NW—SE向的拉张应变, 并且主压应变明显高于主张应变。

Coseismic Displacement of the 2013 Minxian-Zhangxian Ms6.6 Earthquake and Present-day Crustal Deformation in Gansu Province

Time series and characteristics of crustal deformation and coseismic displacement of the 2013 Minxian-Zhangxian M_S6.6 Earthquake in Gansu province and its adjacent areas were obtained by high precision processing of CMONOC GPS data. The result indicates that only the GSMX of CMONOC fiducial stations in this area observed obvious coseismic displacement (about 18.7 mm), which means that the affected area of this earthquake is about 30～50 km from the epicenter, and the crustal movement in this area is active, regular and consistent. The velocity in the west is faster than in the east , the minimum (about 4.4 mm/a) is in the southeast and the maximum (about 18.4 mm/a) is in the southwest . The tectonic deformation in this area is mostly in compressed regime.