Far-field coseismic gravity changes related to the 2015 MW7.8 Nepal(Gorkha)earthquake observed by superconducting gravimeters in Chinese mainland

作者：LeLin Xing,ZiWei Liu,JianGang Jia,ShuQing Wu,ZhengSong Chen,XiaoWei Niu

摘要：Using data from five SGs at four stations in Chinese mainland,obvious permanent gravity changes caused by the 2015 MW7.8 Nepal(Gorkha)earthquake were detected.We analyzed the gravity effects from ground vertical deformation(VD)using co-site continuous GPS(cGPS)data collocated at the Lijiang and the Wuhan station,and hydrological effects using GLDAS models and groundwater level records.After removing these effects,SG observations before and after the earthquake revealed obvious permanent gravity changes:−3.0μGal,7.3μGal and 8.0μGal at Lhasa,Lijiang and Wuhan station,respectively.We found that the gravity changes cannot be explained by the results of dislocation theory.

发文机构：Innovation Academy for Precision Measurement Science and Technology State Key Laboratory of Geodesy and Earth’s Dynamics Hubei Earthquake Agency School of Geodesy and Geomatics National Institute of Metrology

关键词：the2015Nepalearthquakesuperconductinggravimetercoseismicgravitychange

分类号： P31[天文地球—固体地球物理学]