Real-time moment tensor monitoring for the determination of source parameters
Reporter : Hui-Wen Cheng
Abstract
A possibility of monitoring the long-period seismic wavefield in real-time is suggested. The determination of centroid source location and seismic moment tensor for regional earthquakes under real-time is feasible. This new system enables us to monitor long-period seismograms continuously and can further to help to identify long-period events which are undetectable by the conventional monitoring of short-period seismic records. With the current level of personal computers, it should be possible to perform moment tensor inversions for all the mesh points to find the best solution in every second. The results show that the sparse regional broadband seismometer network appears suffice to perform real-time monitoring, which may enable us to realize the seismic hazard early warning, such as tsunami.
References
Kawakatsu, H., 1998: On the realtime monitoring of the long-period seismic wavefield. Bull. Earthquake Res. Inst. , 267–274.
Tajima, F., Megnin, C., Dreger, D.S., Romanowicz, B., 2002: Feasibility of real-time broadband waveform inversions for simultaneous moment tensor and centroid location determination. Bull. Seism. Soc. Am. , 739–750.