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Accelerating seismic moment release and outer‐rise compression: Possible precursors to the next great earthquake in the Alaska Peninsula region
Author(s) -
Jaumé Steven C.,
Estabrook Charles H.
Publication year - 1992
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 - 10.1029/92gl00260
Subject(s) - seismology , geology , peninsula , compression (physics) , seismic moment , seismic zone , moment (physics) , arc (geometry) , subduction , tectonics , induced seismicity , geography , fault (geology) , engineering , mechanical engineering , materials science , physics , archaeology , classical mechanics , composite material
The moment release rate in the Kodiak Island (KI) segment increased prior to the great 1964 Prince William Sound earthquake (M W = 9.2). Starting in 1983 the moment release rate in the Shumagin Island (SI) segment shows a similar increase. In July 1990, an outer‐rise reverse earthquake showed arc‐normal compression at a depth of 42 km seaward of the Alaska Peninsula (AP) segment. Because accelerating moment release and arc‐normal compression have both been proposed as precursors to large and great earthquakes, we suggest this is evidence that the SI‐AP region is nearing the end of the seismic cycle between large thrust earthquakes.