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Application of M wp to tsunami earthquake
Author(s) -
Tsuboi Seiji
Publication year - 2000
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2000gl011735
Subject(s) - tsunami earthquake , seismology , magnitude (astronomy) , geology , duration (music) , tsunami wave , earthquake magnitude , moment magnitude scale , physics , geometry , mathematics , astronomy , scaling , acoustics
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 M wp , 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 M wp and the source duration. Our result suggests that the combination of M wp and the source duration will provide an effective tool to issue early tsunami warnings even for tsunami earthquakes which have anomalously long source duration.