GPS constrained coseismic source and slip distribution of the 2013 Mw6.6 Lushan, China, earthquake and its tectonic implications
GPS constrained coseismic source and slip distribution of the 2013 Mw6.6 Lushan, China, earthquake and its tectonic implications
复制标题
2013年芦山Mw6.6地震GPS约束同震震源和滑移分布及其构造意义
DOI：
10.1002/2013gl058812
复制
发表时间：
2014-01-28
影响因子：
5.2
通讯作者：
Li, Qiang
中科院分区：
文献类型：
--
作者：
Jiang, Zaisen;Wang, Min;Li, Qiang
2013年4月20日芦山地震发生在龙门山断裂带南段。利用33个连续台站的GPS数据，我们得到了地震的三维同震位移场，并反演了断层破裂的位置、几何形状和滑动分布。研究结果表明，这次地震发生在一条走向N28 ° E，倾向NW 43 °的逆断层上，最大滑动量位于北纬30.292 °，东经102.943 °，深度13 km。断裂主要是逆冲断层，轻微但统计上仍然显着的左分量。地震力矩释放为9.5x10（18）Nm，相当于Mw6.6地震。结果表明，龙门山断裂带南端与鲜水河、安宁河断裂的三重交汇处，运动形变场不再是块状，但广泛分布，以适应断层三联点周围变形的支撑作用。要点一套三个-本文提供了芦山地震的三维GPS同震位移资料。破裂以逆冲断裂为主，具有明显的左旋分量，主破裂深度为13 km，力矩释放相当于Mw6.6事件
The 20 April 2013 Lushan earthquake occurred on the southern section of the Longmen Shan fault system. Using GPS data from 33 continuous stations, we derive a three-dimensional coseismic displacement field of the earthquake and invert for the location, geometry, and slip distribution of the fault rupture. Our study result indicates that the earthquake occurred on a reverse fault striking N28 degrees E and dipping 43 degrees to the NW, with the maximum slip located at 30.292 degrees N, 102.943 degrees E, and 13km depth. The rupture is dominated by thrust faulting, with a slight but still statistically significant sinistral component. The seismic moment release is 9.5x10(18)Nm, equivalent to a Mw6.6 earthquake. Our results suggest that at the southern end of the Longmen Shan fault zone near the triple junction with the Xianshuihe and Anninghe faults, the kinematic deformation field is no longer block-like, but broadly distributed to accommodate the buttressing effect of deformation around the fault triple junction.Key Points A set of three-dimensional GPS coseismic displacement data of Lushan earthquake is provided Rupture is dominated by thrust faulting with a significant sinistral component Main rupture is at 13 km depth, with moment release equivalent to Mw6.6 event