Ground failure from the Anchorage, Alaska, earthquake of 30 November 2018

Seismological Research Letteres
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Abstract

Investigation of ground failure triggered by the 2018 MwMw 7.1 Anchorage earthquake showed that landslides, liquefaction, and ground cracking all occurred and caused significant damage. Shallow rock falls and rock slides were the most abundant types of landslides, but they occurred in smaller numbers than global models that are based on earthquake magnitude predict; this might result from the 2018 earthquake being an intraslab event. Liquefaction was common in alluvial and intertidal areas; ground deformation probably related to liquefaction damaged numerous houses and port facilities in Anchorage. Ground cracking was pervasive near the edges of slopes in hilly areas and caused perhaps the most significant property damage of all types of ground failure. A complex of slump–earth flows was triggered along coastal bluffs in southern Anchorage where slides also occurred in 1964; the 2018 slides involved both mobilization of new landside material and reactivation of parts of the 1964 landslide deposits. Large translational slides that formed during the 1964 Alaska earthquake showed evidence of deformation along pre‐existing failure surfaces but did not reactivate with new net downslope displacement. Modeling suggests that ground motion in 2018 was of insufficient duration and too high frequency to trigger reactivation of the deep landslides.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Ground failure from the Anchorage, Alaska, earthquake of 30 November 2018
Series title Seismological Research Letteres
DOI 10.1785/0220190187
Volume 91
Issue 1
Year Published 2019
Language English
Publisher Seismological Society of America
Contributing office(s) Alaska Science Center Geology Minerals, Earthquake Science Center, Geologic Hazards Science Center
Description 14 p.
First page 19
Last page 32
Country United States
State Alaska
City Anchorage
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