Determination of Focal Depth of 2022 Gujiao ML4.1 Earthquake in Shanxi Province by sPL Seismic Phase
The seismic event waveform of Shanxi Gujiao ML4.1 earthquake on February 20,2022 is selected,five seismic stations with epicenter between 10 and 70 km are selected,and the waveform data are processed based on the characteristics of sPL phase.sPL phase is observed at GUJ station with epicenter 23 km away.Using the one-dimensional crust velocity model of Shanxi 2015,SEIS-CAP software is used to calculate the focal mechanism solution of the earthquake,and F-K method is used to calculate the theoretical seismogram,and compared with the observed waveform,the focal depth of the earthquake is determined to be about 4 km.The focal depth measured by sPL phase method and CAP method is basically consistent with the official cataloging results,which indicates that the focal depth of Shanxi Gujiao ML4.1 earthquake measured by sPL phase method is reliable.
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