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Bulletin of the Seismological Society of America; April 1995; v. 85; no. 2; p. 606-613
© 1995 Seismological Society of America
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Rapid determination of Mw from broadband P waveforms

S. Tsuboi, K. Abe, K. Takano and Y. Yamanaka

Earthquake Research Institute University of Tokyo, Tokyo 113, Japan

Abstract

We analyze broadband seismograms for magnitude 5 to 7 earthquakes which occurred in and around Japan to develop a technique to determine moment magnitude from first-arrival P waveforms. We theoretically consider displacements of the P-wave portion on broadband seismograph record as an approximate source time function and integrate them to obtain scalar moments at each station. We show that a combination of multiple records will give a good estimation of moment magnitude without correcting for the source mechanism. This technique is quite simple and robust, so it will be effective for a rapid evaluation of the tsunami potential of a large earthquake.




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