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Complex Faulting and Triggered Rupture During the 2018 M W 7.9 Offshore Kodiak, Alaska, Earthquake
Author(s) -
Ruppert N. A.,
Rollins C.,
Zhang A.,
Meng L.,
Holtkamp S. G.,
West M. E.,
Freymueller J. T.
Publication year - 2018
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 - 10.1029/2018gl078931
Subject(s) - seismology , geology , aftershock , submarine pipeline , earthquake rupture , inversion (geology) , slip (aerodynamics) , seismic energy , fault (geology) , geodesy , tectonics , oceanography , aerospace engineering , engineering
We combine aftershock relocations, source mechanisms, teleseismic P wave backprojection, and Global Positioning System data inversion to constrain complex faulting geometry of the 2018 M W 7.9 offshore Kodiak earthquake. Relocated aftershocks delineate several N‐S trends including a prominent 110‐km‐long segment, as well as broad NE‐SW trends. Global Positioning System modeling and backprojection indicate that the NE‐SW trending left‐lateral strike‐slip segments released most energy dominating far‐field crustal deformation and radiated wavefield. Backprojection infers fast E‐to‐W rupture propagations superimposed on a slower S‐to‐N migration. We propose a five‐segment model of the rupture that was partially driven by dynamic triggering.