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

Ruppert, N. A.; Rollins, C.; Zhang, A.; Meng, L.; Holtkamp, S. G.; West, M. E.; Freymueller, J. T.

doi:10.1029/2018gl078931

i

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

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2018
By Ruppert, N. A. ; Rollins, C. ; Zhang, A. ; ...

Details

Journal Title:

Geophysical Research Letters
Personal Author:

Ruppert, N. A. ; Rollins, C. ; Zhang, A. ; Meng, L. ; Holtkamp, S. G. ; West, M. E. ; Freymueller, J. T.
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research)
Description:

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.
Keywords:

General Earth And Planetary Sciences Geophysics General Earth And Planetary Sciences General Earth And Planetary Sciences
Source:

Geophysical Research Letters, 45(15), 7533-7541
DOI:

https://doi.org/10.1029/2018gl078931
ISSN:

0094-8276 ; 1944-8007
Format:

PDF
Publisher:

American Geophysical Union (AGU)
Document Type:

Journal Article
Funding:

Grant no. NA13OAR4320056
Rights Information:

Other
Compliance:

Library
Main Document Checksum:

urn:sha256:959711dc3b785a5fb63d2f158bf774c98253118476b3d1ed455acacd4105fb3d
Download URL:

https://repository.library.noaa.gov/view/noaa/59791/noaa_59791_DS1.pdf
File Type:

[PDF - 3.26 MB ]

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