Near-field shear-wave splitting of 2014 Yingjiang Ms6.1 earthquake sequence
Sun Nan
Gao Yuan
Zhao Xiaoyan
Su Youjin
Liu Geng
Wu Chengdong
Abstract：SAM (systematic analysis method of shear-wave splitting) has been applied to numerous waveform data recorded by near-field mobile seismic stations of Yingjiang Ms6.1 earthquake sequence occurred on May 30,2014.The results showed that the polarization of fast shear-wave of the earthquake sequence was consistent with regional principal compressive stress of NS tren-ding.The polarization of fast shear-wave has a counterclockwise deflection at the station KAC,and dispersion decrease at the station MNO due to the adjust-ment of stress state in seismic region after the main shock.Influenced by faults of the studied area,the polarization of fast shear-wave at the station MNO pres-ents a more discrete state compared to that of KAC.The time-delays of slow shear-wave at the stations KAC and MNO both present the feature of sudden contraction before the main shock and increase after the event,which means release and enhancement of crustal stress before and after the earthquake,and also indicates constant occurrence of aftershocks.The oscillation of time-delay curves suggests that the occurrence of aftershocks is accompanied by continuous adjustment of crustal stress in seismic region.
Keywords：Yingjiang Ms6.1 earthquake sequenceshear wave splittingpolarizationtime-delayfault
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：13( 34-46 )