Double Difference Relocation and Focal Mechanisms of the Jinggu M s6.6 Earthquake Sequences in Yunnan Province in 2014
Xu Fukun
Liu Zifeng
Zhang Zhuqi
Li Jing
Liu Lifang
Su Youjin
Abstract：The research of Yunnan Jinggu earthquake is not so intensive.To discuss the seismogenic structure and distribution of se-quences of Jinggu Ms 6.6 earthquake,7 October 2014,we relocated the mainshock by using the 3D velocity model of Yunnan and Sichuan province (Loc3dSB),and then relocated the sequences during 7th to 31th October 2014 using the double-difference relocation algorithm,by using and phase data from seismic network of Yunnan province.Furthermore the focal mechanism solutions are derived by using P-wave polarity first-motion and amplitude ratio method.The sequences appear to be strike-slip type mostly,with the princi-pal compressive stress axis trends both NNE and NE directions.And the sequences are distributed dominantly linearly shaped in the NW direction with its southeast endpoint appears deeper than northwest.Both of which indicate that the early major rupture plane is the NW nodal plan,appears to be a right-lateral strike-slip faulting with a small normal component.Meanwhile the linearly shaped distribu-tion and focal mechanisms varies with locations on different segments,with clear end-points and transform segment.Furthermore,af-tershocks at SE end-point expand gradually to new geometrically unclear segment,which may indicate another rupture.
Keywords：Jinggu earthquake sequencesthe double-difference relocationthe focal mechanismsearthquake
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：14( 1741-1754 )