Time-domain method of source parameters considering elliptic model for Mw≥5.5 earthquakes
In order to enhance the timeliness,earthquake early warning systems commonly assume a point source without considering the size of source,rupture direction and stress drop in the source area.The simplified processing of source parameters leads to a coarse prediction of the ground motion distribution,especially for destructive large earthquakes.In this paper,we utilize strong motion recordings from Japanese earthquakes(Mw≥5.5),incorporate an elliptical source model,and propose a time-domain approach for determining source parameters such as moment magnitude,corner frequency and stress drop of moderate and large earthquakes.We also analysis the impact of site effect,ground motion propagation attenuation,source effects and filtering frequency bands on the time domain method.The results show that this method can use P-wave information to rapidly obtain the source energy release process,quantify the evolution process of the corner frequencies in the source spectrum,stress drop and rupture area with rupture propagation,providing crucial source parameters for predicting ground motion.
Earthquake Early WarningTime domainMoment magnitudeCorner frequencyStress dropRupture area
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