Application of Mwp to tsunami earthquake

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Title:
Application of Mwp to tsunami earthquake Authors:
Tsuboi, Seiji Affiliation:
AA(Faculty of Science, Yokohama City University, Yokohama, Japan) Publication:
Geophysical Research Letters, Volume 27, Issue 19, p. 3105-3108 (GeoRL Homepage) Publication Date:
10/2000 Origin:
AGU AGU Keywords:
Seismology: Earthquake parameters, Seismology: Instruments and techniques, Seismology: General or miscellaneous Abstract Copyright:
(c) 2000: American Geophysical Union DOI:
10.1029/2000GL011735 Bibliographic Code:
2000GeoRL..27.3105T

Abstract

Tsunami earthquake produces anomalously strong tsunamis for their surface wave magnitude. To issue accurate early tsunami warnings for tsunami earthquakes, it is critical to identify them as tsunamigenic events as early as possible. Here we show that a pulse width of P-wave, which we use to calculate broadband moment magnitude Mwp, gives accurate estimates of source duration time. We find that we may identify 1992 Nicaragua earthquake as a possible tsunamigenic earthquake by using a combination of both Mwp and the source duration. Our result suggests that the combination of Mwp and the source duration will provide an effective tool to issue early tsunami warnings even for tsunami earthquakes which have anomalously long source duration.
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