Rapid determination of Mw from broadband P waveforms

• DOI: 10.1785/bssa0850020606
• Publication Date: 1995-04-01
• Authors: Seiji Tsuboi; K. Abe; Kiyoshi Takano; Yusuke Yamanaka
• Keywords: Seismogram; Seismometer; Moment magnitude scale; Seismic moment

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