Focal mechanism of the Sheyang Ms4.4 earthquake on October 20, 2016 and the spatio-temporal distribution of the earthquake sequence
Li Feng
Li Yingchun
Li Qiang
Feng Zhisheng
Wang Junfei
Abstract：Based on the digital waveforms of Jiangsu seismic network,the focal mechanism of the Sheyang Ms4.4 earthquake was determined by using the CAP (cut and paste) method,and the ML≥1.5 events of Sheyang earthquake sequence were relocated by using the HypoDD method.The result shows that the strike,dip and rake of the Ms4.4 event are 304°,53°,0° for the nodal plane Ⅰ,and 214°,90°,143° for the nodal plane Ⅱ,respectively,and the centroid depth is about 14 km.The relocation for the Sheyang earthquake sequence shows that the earthquake sequence was located between Hongze-Goudun fault and Yaneheng-Nanyang'an fault with the predominant direction NW60° in horizontal space,and the sequence propagated from southeast to northwest with the focal depth of 6-23 km.According to the focal mechanism solutions and the relocation results,we deduce that the Sheyang Ms4.4 earthquake is a left-lateral slip event induced by shear rupture northwestwards under regional stress field,and its fault plane is nodal plane Ⅰ.
Keywords：Sheyang Ms4.4 earthquakefocal mechanismhypoDDMohr-Coulomb failure criterion
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：10( 659-668 )