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Application of M_wp to deep and teleseismic earthquakes

Department of Geoscience, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka 239, Japan tsuboi{at}cc.nda.ac.jp
West Coast & Alaska Tsunami Warning Center, 910 S. Felton Street, Palmer, Alaska 99645.atwc{at}alaska.net

Abstract

The broadband moment magnitude M_wp (Tsuboi, et al., 1995) allows for the effective determination of earthquake magnitude by using broadband P waveforms. It was developed to determine moment magnitude of shallow earthquakes around the Japanese Islands for early tsunami warnings. Tsuboi et al. (1995) demonstrated that M_wp shows good agreement with the M_w from Harvard centroid moment tensor (CMT) solutions. In the present study, we show that M_wp is also applicable to deep earthquakes and earthquakes recorded at teleseismic distances. The M_wp proves to be useful for quick, accurate size estimates of earthquakes recorded at both regional and teleseismic distances occurring at any depth.

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