Complex Faulting and Triggered Rupture During the 2018 MW 7.9 Offshore Kodiak, Alaska, Earthquake

We combine aftershock relocations, source mechanisms, teleseismic P wave backprojection, and Global Positioning System data inversion to constrain complex faulting geometry of the 2018 MW 7.9 offshore Kodiak earthquake. Relocated aftershocks delineate several N‐S trends including a prominent 110‐km‐...

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Bibliographic Details
Main Authors: Ruppert, NA, Rollins, C, Zhang, A, Meng, L, Holtkamp, SG, West, ME, Freymueller, JT
Format: Article in Journal/Newspaper
Language:English
Published: American Geophysical Union 2018
Subjects:
Kodiak
Alaska
Online Access:https://eprints.whiterose.ac.uk/155115/
https://eprints.whiterose.ac.uk/155115/1/2018GL078931.pdf
Description
Summary:We combine aftershock relocations, source mechanisms, teleseismic P wave backprojection, and Global Positioning System data inversion to constrain complex faulting geometry of the 2018 MW 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.

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