基于敏感度的迭代拟合法反演玛尼Ms7.9级地震滑动分布

Ms 7.9 Manyi Earthquake Slip Distribution Inversion by a Sensitivity-based Iterative Fitting Method

1997年11月8日，西藏玛尼地区发生了Ms7．9级地震。利用欧空局的ERS2卫星获取的干涉同震形变场，结合提取到的断层地表位置，基于弹性半空间位错模型，采用基于敏感度迭代拟合法反演获取了玛尼地震的精细滑动分布。结果表明，断层面最大滑动量为6．78m，主要的滑动量分布在沿断层走向的12～112km之间，主要分布深度为0～16km，反演得到的地震矩为2．01×10^20Nm（Mw7．50）。

On November 8,1997, a Ms 7.9 Manyi earthquake was occurred in Qinghai-Tibet. Using InSAR cosesimic deformation acquired by ESA ERS2 satellite, and combining with the fault trace derived form the correlation data and azimuth offset map and basing on dislocation model in elastic half-space, we derive the slip distribution by utilizing a sensitivity-based iterative fitting method. Distributed-slip model indicates that the cosesimic slip reaches about 6. 78 m. The slip is concentrate to 12-112 km along the strike direction, with most of the moment release located on the shallow part above 16 km depth. The geodetic estimate of seismic moment is 2.01 × 10^20Nm （Mw 7.50）, is consistent with seismic estimates.