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dc.contributor.author
Ulrich, Thomas
dc.contributor.author
Vater, Stefan
dc.contributor.author
Madden, Elizabeth H.
dc.contributor.author
Behrens, Jörn
dc.contributor.author
van Dinther, Ylona
dc.contributor.author
Van Zelst, Iris
dc.contributor.author
Fielding, Eric J.
dc.contributor.author
Liang, Cunren
dc.contributor.author
Gabriel, Alice-Agnes
dc.date.accessioned
2019-10-25T11:48:37Z
dc.date.available
2019-10-25T05:01:21Z
dc.date.available
2019-10-25T11:48:37Z
dc.date.issued
2019-10
dc.identifier.issn
0033-4553
dc.identifier.issn
1420-9136
dc.identifier.issn
1557-7368
dc.identifier.other
10.1007/s00024-019-02290-5
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/372776
dc.identifier.doi
10.3929/ethz-b-000372776
dc.description.abstract
The September 2018, Mw 7.5 Sulawesi earthquake occurring on the Palu-Koro strike-slip fault system was followed by an unexpected localized tsunami. We show that direct earthquake-induced uplift and subsidence could have sourced the observed tsunami within Palu Bay. To this end, we use a physics-based, coupled earthquake–tsunami modeling framework tightly constrained by observations. The model combines rupture dynamics, seismic wave propagation, tsunami propagation and inundation. The earthquake scenario, featuring sustained supershear rupture propagation, matches key observed earthquake characteristics, including the moment magnitude, rupture duration, fault plane solution, teleseismic waveforms and inferred horizontal ground displacements. The remote stress regime reflecting regional transtension applied in the model produces a combination of up to 6 m left-lateral slip and up to 2 m normal slip on the straight fault segment dipping 65∘ East beneath Palu Bay. The time-dependent, 3D seafloor displacements are translated into bathymetry perturbations with a mean vertical offset of 1.5 m across the submarine fault segment. This sources a tsunami with wave amplitudes and periods that match those measured at the Pantoloan wave gauge and inundation that reproduces observations from field surveys. We conclude that a source related to earthquake displacements is probable and that landsliding may not have been the primary source of the tsunami. These results have important implications for submarine strike-slip fault systems worldwide. Physics-based modeling offers rapid response specifically in tectonic settings that are currently underrepresented in operational tsunami hazard assessment.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Springer
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.subject
Sulawesi
en_US
dc.subject
tsunami
en_US
dc.subject
earthquake dynamics
en_US
dc.subject
coupled model
en_US
dc.subject
physics-based modeling
en_US
dc.subject
strike slip
en_US
dc.title
Coupled, Physics-Based Modeling Reveals Earthquake Displacements are Critical to the 2018 Palu, Sulawesi Tsunami
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
ethz.journal.title
Pure and Applied Geophysics
ethz.journal.volume
176
en_US
ethz.journal.issue
10
en_US
ethz.journal.abbreviated
Pure Appl. Geophys.
ethz.pages.start
4069
en_US
ethz.pages.end
4109
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.grant
Centre of Excellence for Exascale in Solid Earth
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Basel
en_US
ethz.publication.status
published
en_US
ethz.grant.agreementno
823844
ethz.grant.fundername
EC
ethz.grant.funderDoi
10.13039/501100000780
ethz.grant.program
H2020
ethz.date.deposited
2019-10-25T05:01:28Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2019-10-25T11:49:03Z
ethz.rosetta.lastUpdated
2021-02-15T06:25:11Z
ethz.rosetta.versionExported
true
ethz.COinS
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