Missing earthquakes detection and seismogenic structure of the Yuxian earthquake swarm in August of 2013
Tan Yipei
Cao Jingquan
Bian Zhenfu
Liu Wenbing
Deng Li
Xu Ke
Abstract：The increasing seismicity of small earthquake swarms have been ob-served in North China area during recent years.Due to the lack of digital wave-form recordings of large earthquakes in this area,detailed seismogenic structure analysis of earthquake swarms is of significance to seismic risk analysis and earthquake tendency judgement.We herein used matched filter technique to de-tect missing earthquakes in Yuxian small earthquake swarm occurred during August 22nd to 25th,2013.By the technique we detected 18 missing earth-quakes,which are about 1.38 times of 13 listed in the catalog.The seismogenic structure of the earthquake swarm can be divided into two parts.One is an NE-trending fault and more active in the early time of this earthquake swarm;the other is an NW-trending fault on which more earthquakes occurred in the later time.The seismicity is much stronger in the NW-trending fault than that in the NE-trending fault.According to focal mechanism of two lager earthquakes in the swarm,it is suggested that the mechanism of earthquakes occurred on the NW-trending fault are dominated by normal slip.
Keywords：matched filterYuxian earthquake swarmmissing earthquakes de-tectionearthquake relocationfocal mechanism
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 1022-1031 )