Enhanced Rainfall‐Induced Shallow Landslide Activity Following Seismic Disturbance—From Triggering to Healing
dc.contributor.author
Leshchinsky, Ben
dc.contributor.author
Lehmann Grunder, Peter Ulrich
dc.contributor.author
Or, Dani
dc.date.accessioned
2021-02-15T16:30:44Z
dc.date.available
2021-02-02T08:11:51Z
dc.date.available
2021-02-15T16:30:44Z
dc.date.issued
2021-01-28
dc.identifier.issn
0148-0227
dc.identifier.issn
2169-9003
dc.identifier.issn
2169-9011
dc.identifier.other
10.1029/2020JF005669
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/467208
dc.description.abstract
Evidence suggests that following earthquakes, landslide activity, and susceptibility remain elevated for months to years after cessation of shaking. In landslides constrained within the soil mantle, enhanced post‐seismic activity may be attributed to persistence of progressive failure surface development that results in delayed triggering. With subsequent post‐seismic hydrologic disturbance, a commensurate decay in activity over time reflects evacuation of damaged hillslope materials and mechanical healing of colluvial media and vegetation recovery. In this study, we propose a hydromechanical model for representing the interplay of these processes including trends in timing and magnitude of post‐seismic shallow landslide activity. The hydromechanical model considers seismic or hydrologic disturbances as drivers for failure surface development in the soil mantle over a hillslope with commensurate weakening through accumulation of internal compression, shear softening, and loss of root strength. In the absence of well‐instrumented post‐seismic landslide measurement of evolving stress conditions and deformation, predictions were made against a unique field case study where hydrologically induced hillslope failure kinematics and internal compression were measured. The model accounts for seismic disturbances, demonstrating that certain peak ground accelerations directly reduce subsequent rainfall‐induced landslide‐triggering thresholds relative to undisturbed hillslopes. The model framework can be used to describe progressive, post‐seismic landslide activity, demonstrating that consideration of root or soil healing may suppress subsequent landslide triggering and contribute toward recovery to pre‐seismic disturbance levels of strength. Factors such as shear softening, vegetation, and healing are explored in the context of the temporal evolution of landslide rates after a seismic event. The results of this paper show mechanistically how (1) progressive development or cessation of a failure surface in active, post‐seismic landslides may describe elevated post‐seismic landslide rates and (2) that hillslope healing plays a modest role in the magnitude and timescale of attenuated landslide activity. © 2020 American Geophysical Union
en_US
dc.language.iso
en
en_US
dc.publisher
Wiley
en_US
dc.subject
earthquakes
en_US
dc.subject
geomechanics
en_US
dc.subject
hydrology
en_US
dc.subject
landslides
en_US
dc.subject
modeling
en_US
dc.subject
post‐seismic
en_US
dc.title
Enhanced Rainfall‐Induced Shallow Landslide Activity Following Seismic Disturbance—From Triggering to Healing
en_US
dc.type
Journal Article
dc.date.published
2020-12-11
ethz.journal.title
Journal of Geophysical Research: Earth Surface
ethz.journal.volume
126
en_US
ethz.journal.issue
1
en_US
ethz.journal.abbreviated
J. geophys. res. Earth surf.
ethz.pages.start
e2020JF005669
en_US
ethz.size
26 p.
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Hoboken, NJ
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2021-02-02T08:11:59Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2021-02-15T16:31:01Z
ethz.rosetta.lastUpdated
2022-03-29T05:14:02Z
ethz.rosetta.versionExported
true
ethz.COinS
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