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dc.contributor.author
Lupi, Matteo
dc.contributor.author
Miller, Stephen Andrew
dc.date.accessioned
2019-07-04T10:24:44Z
dc.date.available
2017-06-11T10:13:12Z
dc.date.available
2019-07-04T10:24:44Z
dc.date.issued
2014
dc.identifier.issn
1869-9510
dc.identifier.issn
1869-9529
dc.identifier.other
10.5194/se-5-13-2014
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/85976
dc.identifier.doi
10.3929/ethz-b-000085976
dc.description.abstract
Eruptive rates in volcanic arcs increase significantly after subduction mega-thrust earthquakes. Over short to intermediate time periods the link between mega-thrust earthquakes and arc response can be attributed to dynamic triggering processes or static stress changes, but a fundamental mechanism that controls long-term pulses of volcanic activity after mega-thrust earthquakes has not been proposed yet. Using geomechanical, geological, and geophysical arguments, we propose that increased eruption rates over longer timescales are due to the relaxation of the compressional regime that accompanies mega-thrust subduction zone earthquakes. More specifically, the reduction of the horizontal stress σh promotes the occurrence of short-lived strike-slip kinematics rather than reverse faulting in the volcanic arc. The relaxation of the pre-earthquake compressional regime facilitates magma mobilisation by providing a short-circuit pathway to shallow depths by significantly increasing the hydraulic properties of the system. The timescale for the onset of strike-slip faulting depends on the degree of shear stress accumulated in the arc during inter-seismic periods, which in turn is connected to the degree of strain-partitioning at convergent margins. We performed Coulomb stress transfer analysis to determine the order of magnitude of the stress perturbations in present-day volcanic arcs in response to five recent mega-thrust earthquakes; the 2005 M8.6, 2007 M8.5, and 2007 M7.9 Sumatra earthquakes; the 2010 M8.8 Maule, Chile earthquake; and the 2011 M9.0 Tohoku, Japan earthquake. We find that all but one the shallow earthquakes that occurred in the arcs of Sumatra, Chile and Japan show a marked lateral component. We suggests that the long-term response of volcanic arcs to subduction zone mega-thrust earthquakes will be manifested as predominantly strike-slip seismic events, and that these future earthquakes may be followed closely by indications of rising magma to shallower depths, e.g. surface inflation and seismic swarms.
en_US
dc.language.iso
en
en_US
dc.publisher
Copernicus
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/3.0/
dc.title
Short-lived tectonic switch mechanism for long-term pulses of volcanic activity after mega-thrust earthquakes
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 3.0 Unported
dc.date.published
2014-01-06
ethz.journal.title
Solid Earth
ethz.journal.volume
5
en_US
ethz.journal.issue
1
en_US
ethz.journal.abbreviated
Solid earth
ethz.pages.start
13
en_US
ethz.pages.end
24
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.nebis
010169024
ethz.publication.place
Göttingen
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02704 - Geologisches Institut / Geological Institute::03392 - Burg, Jean-Pierre (emeritus)
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02704 - Geologisches Institut / Geological Institute::03392 - Burg, Jean-Pierre (emeritus)
ethz.date.deposited
2017-06-11T10:13:52Z
ethz.source
ECIT
ethz.identifier.importid
imp5936520b27b4986403
ethz.ecitpid
pub:135430
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-20T13:40:24Z
ethz.rosetta.lastUpdated
2019-07-04T10:25:00Z
ethz.rosetta.versionExported
true
ethz.COinS
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