尼泊尔MW7.9地震震后断层滑动时空特征分析

利用2015年尼泊尔MW7.9地震震后16个站531 d的连续观测数据，基于弹性位错理论，使用主成分反演方法（PCAIM）分析该地震震后断层滑动的时空变化特性。结果表明：1）震后断层滑动服从对数衰减模式；2）余滑主要分布在主震破裂带北部区域，最大滑动量达到20.6 cm，位于地表以下26.7 km处；3）余滑释放的地震矩为3.36×1020 N·m，对应矩震级约为M_W7.6。

Temporal-Spatial Distribution of Post-Seismic Afterslip Associated with the 2015 MW7.9 Nepal Earthquake

Based on elastic dislocation theory, we use principal component analysis-based inversion method (PCAIM) and 531-day data from 16 GPS stations to study the temporal and spatial variation characteristics of fault slip after 2015 M_W7.9 Nepal earthquake. The results show that (1) the post-seismic afterslip obeys logarithmic decay patterns; (2) the fault slip is mainly concentrated in the northern part of the mainshock rupture zone, with the maximum slip of 20.6 cm located at 26.7 km depth; (3) the inverted seismic moment is 3.36×1 020 N·m, equivalent to a moment magnitude (MW) of 7.6.