Detection and analysis of repeating earthquakes in Guanxian--Anxian fault by using waveform cross-correlation
Zheng Chen
Ding Zhifeng
Zhou Xiaofeng
Ye Qingdong
LMiaomiao
Abstract：By taking earthquakes from China Earthquake Networks Center cata-log as template events,we detected repeating earthquakes down to ML 0.0 from continuous waveforms recorded by 17 portable seismic stations deployed near the Guanxian--Anxian fault through a sliding-window cross-correlation tech-nique.Then,based on double-difference algorithm combined with waveform cross-correlation,243 of the detected earthquakes were relocated.The results indicate that seismicity of Guanxian-Anxian fault became weaker during the studied period.The predominance distribution of focal depth is 5—15 km and the depth profile reveals that focal depth distributes in westward dipping with a high angle.The epicenters of these earthquakes are distributed in NE direction, which coincides with the strike of front-range fault of Longmenshan fault zone. There are differences in seismicity and b value between the northern and south-ern segments in the studied region,which may be related to regional stress field of the middle segment of Longmenshan fault zone where directions of stress transfer from WNW to ENE from south to north.
Keywords：waveform cross-correlationrepeating earthquakesdouble-differ-ence location methodGuanxian--Anxian fault
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：13( 299-311 )