Analysis on the Effect of Several Parameters on the Accuracy of Earthquake Location:A Case Study of the 2019 Changning MS6.0 Earthquake in Sichuan
The accuracy of seismic locations is an important foundation for conducting better studies on crust-mantle structures.Due to the sparsity of the distance between seismic stations,the seismic position released by seismic network shows a large horizontal error.Moreover,the vertical uncertainty is much greater than the horizontal uncertainty,which is insufficiently accurate to meet the demands of high precision structural research.Therefore,it is significant to conduct a comprehensive analysis of diverse parameters related to hypocentral position and to optimize the accuracy of hypocentral location prior to imaging a more reliable crust-mantle structure.This study used the Changning MS6.0 earthquake as a case study and applied a grid search method based on forward process to relocate earthquakes.The qualitative analysis showed that the accuracy of hypocentral location is significantly impacted by incomplete azimuthal coverage and the difficulty in identifying S-wave arrival.In addition,we quantitatively analyzed the tradeoff relationships from data amount and velocity model to hypocentral depth.These relationships between parameters and position uncertainties suggested a general adherence to a previous criteria for earthquake location.Moreover,we found that the BJT and ZYT seismic stations may have large timing deviations.
earthquake locationthe Changning MS6.0 earthquakecriteria for earthquake location
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