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Rupture extent of the 1938 Alaskan earthquake as inferred from tsunami waveforms
Author(s) -
Johnson Jean M.,
Satake Kenji
Publication year - 1994
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 - 10.1029/94gl00333
Subject(s) - aftershock , seismology , tsunami earthquake , geology , foreshock , seismic moment , interplate earthquake , waveform , seismic microzonation , seismic gap , seismic zone , intraplate earthquake , moment magnitude scale , magnitude (astronomy) , induced seismicity , fault (geology) , tectonics , physics , geometry , mathematics , quantum mechanics , voltage , scaling , astronomy
Using tsunami waveforms, we estimate the source parameters of the 10 November 1938 Alaskan earthquake. The earthquake ruptured a 300‐km‐long segment of the Alaskan arc, which corresponds to the aftershock area. The seismic moment is approximately 20×10 20 Nm, or M w =8.2, and the moment release was concentrated in the eastern end of the aftershock zone. The tsunami and seismic evidence strongly suggest that the 1938 earthquake did not rupture into the Shumagin Islands gap.