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TitreInterplate earthquakes as a driver of shallow subduction erosion
AuteurWang, K; Hu, Y; von Huene, R; Kukowski, N
SourceGeology vol. 38, no. 5, 2010 p. 431-434, https://doi.org/10.1130/G30597.1
Année2010
Séries alt.Secteur des sciences de la Terre, Contribution externe 20090309
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1130/G30597.1
Mediapapier; en ligne; numérique
Formatspdf
Sujetssecousses séismiques; mécanismes de tremblement de terre; subduction; zones de subduction; mouvements des plaques; marges plaques; érosion; détermination des contraintes; tectonique; géophysique
Illustrationsschematic representations
ProgrammeTargeted Hazard Assessments in Western Canada, Géoscience pour la sécurité publique
Résumé(disponible en anglais seulement)
Basal erosion is a prevalent process at subduction zones and plays an important role in the mass balance of global plate tectonics. In contradiction with the theoretical expectation that basal erosion requires high basal friction and hence compression in the upper plate, extensional faulting is commonly observed in submarine wedges that undergo such erosion. Here we propose a model to explain this apparent paradox in terms of stress fl uctuations during earthquake cycles. In this model, basal erosion occurs during large earthquakes when the shallow, rate-strengthening part of the plate interface strengthens and its overlying wedge weakens, but extension occurs during interseismic relaxation of wedge stress. The mechanics of basal erosion provide important information on the nature of the updip limit of the megathrust seismogenic zone in margins dominated by basal erosion.
GEOSCAN ID248265