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Determination of Seismogenic Structure for the Shenyang M5 1/2 Earthquake in 1765

WAN Bo1,ZHAO Xiaohui1,HOU Jianjun2 1.Earthquake Administration of Liaoning Province,Shenyang 110031;2.School of Earth and Space Sciences,Peking University,Beijing 100871  
The deep-shallow geological structural conditions and seismic activities for the Shenyang M5 1/2 earthquake in 1765 are analyzed,the activities and seismic hazards for the Changbaixiang-Guanyinge fault(F6),the Yilan-Yitong fault,the Hunhe fault which around the epicenter are also evaluated.It is analogised of seismic structure for mid-strong earthquakes in the area of Liaoning.It is determined that the modern tectonic deformation features for the F6 is coincident with the effect of modern tectonic stress.Results of shallow seismic prospectings,progressive features of fault ruptures,aging data and offset landform show that the F6 is still active in late Quaternary.Modern slight shocks distribute along the F6.The F6 interjuncts to the Hunhe fault at the depth of 5-6 km or more,it has an echelon structure in planimetric trend,and the length of fault segment is about 20-25 km.The F6 possess the condition of gestating and generating an earthquake of 5 1/2 or so.The F6 is determined to be more active than the Yilan-Yitong and the Hunhe fault,and it has a higher seismic hazard.The F6 is the seismogenic structure for the Shenyang M5 1/2 earthquake in 1765.
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