InSAR约束下2001年昆仑山MS 8.1地震震后粘弹性松弛效应

根据2001年昆仑山MS8.1地震震后2~6 a的InSAR形变场，采用震后粘弹性松弛模型进行模拟，使用半解析平面分层模型研究青藏高原昆仑山地震震区流变结构。Maxwell半空间粘弹性应力松弛模型模拟结果表明，最优的弹性上地壳厚度为15~20 km，莫霍面深度为70 km，该地区下地壳有效粘滞系数在（1~2.5）×1019 Pas之间，上地幔有效粘滞系数在（1~6.3）×1019 Pas之间。该结果与青藏高原玛尼震区的震后粘弹性松弛反演结果基本一致。

Post-Seismic Viscoelatic Relaxation of the 2001 Kunlun Mountain MS8.1 Earthquake Constrained by InSAR

In this paper,we use the displacement time series for a period between 2 and 6 years after the 2011 Kunlun mountain MS8.1 earthquake.The deformation field is simulated by post-seismic viscoelastic relaxation,then we use the semi analytic plane delamination model to analyze the lithospheric rheological structure of northern Kunlun.The lower crust and upper mantle's viscoelastic flow mainly causes post-seismic relaxation.Models of viscoelastic stress relaxation in a Maxwell half-space gives a best fitting result.The best thickness of elastic upper crust is 15 km-20 km,the Moho depth is 70 km, the valid viscosity of lower crust ranges from 1×1019 Pas to 2.5×1019 Pas and the viscosity of the upper mantle ranges from 1×1019 Pas to 6.3×1019 Pas.The result is consistent with the inversion of post-seismic viscoelastic relaxation caused by Manyi earthquake,thus it can provide significant basis for understanding tectonic movement in the Qinghai-Tibet plateau.