Seismic Activity Characteristic of Ruyuan ME 2.8 Earthquake Swarm in October, 2016 in Guangdong
WANG Xiaona
DENG Zhihui
YE Donghua
LIU Tepei
LIU Jiping
SHAO Ye
Abstract：The ML 2.8 earthquake swarm occurred in Ruyuan of Guangdong province from October 7th to 26th,2016.There are 250 earthquakes recorded,including 166 ML 1.0-1.9 earthquakes and 17 ML 2.0-2.9 earthquakes,the largest earthquake of this swarm is the ML 2.8 earthquake which occurred in October 10th with the focal depth of 8km.According to the comparisons of seismic activity,wave velocity ratios and apparent stress between Ruyuan swarm and Nanshui reservoir swarm,the paper premonitory estimates that Ruyuan earthquakes which occurred under the background of low compressional stress are not the reservoir-induced earthquakes,which confirmed the southeastern coastal area's seismic activity characteristic that the seismic activity transfers from reservoir area to non-reservoir area.The Ruyuan earthquakes distribute along north-west striking valley and the mechanism of Ruyuan mainshock is left-lateral strike-slip,with normal component.Combing seismotectonic environment and field survey,the paper speculates a buried fault which may be the seismogenic of Ruyuan swarm exists from epicentral area to Wangbu of Yingde city.This fault dips to southwest,with strike angle of 310°and dip angle of 47,it may be the conjugate structure of NE Wuchuan-Sihui fault,which has close relationship with the seismicity enhance of Wuchuan-Sihui fault.
Keywords：Ruyuan swarmNanhui reservoirBuried faultSeismogenicWuchuan-Sihui fault
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 1-8 )