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Distinguishing intraplate from megathrust earthquakes using lacustrine turbidites

dc.rights.licenseopenen_US
hal.structure.identifierRenard Centre of Marine Geology [RCMG]
dc.contributor.authorVAN DAELE, Maarten
dc.contributor.authorARAYA-CORNEJO, Cristian
dc.contributor.authorPILLE, Thomas
dc.contributor.authorVANNESTE, Kris
hal.structure.identifierRenard Centre of Marine Geology
dc.contributor.authorMOERNAUT, Jasper
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorSCHMIDT, Sabine
IDREF: 131836129
dc.contributor.authorKEMPF, Philipp
dc.contributor.authorMEYER, Inka
dc.contributor.authorCISTERNAS, Marco
dc.date.accessioned2024-02-29T14:20:57Z
dc.date.available2024-02-29T14:20:57Z
dc.date.issued2019-02
dc.identifier.issn0091-7613en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/188511
dc.description.abstractEnSubduction zone seismicity arises from megathrust, crustal, and intraslab earthquakes, and understanding the recurrence patterns of each type is crucial for hazard assessments. Lake sediments can record earthquakes from all three seismogenic sources. Here, we studied the turbidite record of Lo Encañado, an Andean lake located in central Chile. We show that Lo Encañado turbidites can be attributed to (1) subaquatic slope failure by earthquake shaking (coseismic phase), (2) floods or human impact, and (3) postseismic catchment response. All historical events with shaking intensities >VI (modified Mercalli intensity) have triggered coseismic turbidites, but only the intraplate earthquakes triggered subaerial slope failures followed by postseismic turbidites. We argue that this contrasting result is due to different spectra of seismic waves from these earthquake sources: higher-frequency accelerations from intraplate earthquakes are hardly attenuated in rocks around the lake, whereas lower-frequency accelerations from megathrust earthquakes are amplified in soft lake sediments. We tested our findings by comparing acceleration response spectra of recent and historical intraslab and megathrust earthquakes along a longitudinal profile. Results suggest that the location of Andean lakes is ideal to distinguish earthquake sources.
dc.language.isoENen_US
dc.title.enDistinguishing intraplate from megathrust earthquakes using lacustrine turbidites
dc.typeArticle de revueen_US
dc.identifier.doi10.1130/G45662.1en_US
dc.subject.halSciences de l'environnementen_US
dc.subject.halSciences de l'environnement/Milieux et Changements globauxen_US
bordeaux.journalGeologyen_US
bordeaux.page127-130en_US
bordeaux.volume47en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.issue2en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamSEDIMen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcehal
hal.identifierhal-02357289
hal.version1
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exportfalse
workflow.import.sourcehal
dc.rights.ccPas de Licence CCen_US
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Geology&rft.date=2019-02&rft.volume=47&rft.issue=2&rft.spage=127-130&rft.epage=127-130&rft.eissn=0091-7613&rft.issn=0091-7613&rft.au=VAN%20DAELE,%20Maarten&ARAYA-CORNEJO,%20Cristian&PILLE,%20Thomas&VANNESTE,%20Kris&MOERNAUT,%20Jasper&rft.genre=article


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