Paleoseismicity derived from piston coring methods, Explorer and Juan de Fuca Plate systems, Bristish Columbia.

Riedel, Michael and Conway, K. W. (2015) Paleoseismicity derived from piston coring methods, Explorer and Juan de Fuca Plate systems, Bristish Columbia. . Geological Survey of Canada Current Research, 2015-10 . UNSPECIFIED, 11 pp. DOI 10.4095/297317.

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Abstract

Coring of marine sediments has revealed deposits related to slope instability induced by seismicity on the western margin of Canada. Debris flows and turbidite sequences related to megathrust earthquakes have been recovered in six piston cores on the Juan de Fuca and Explorer tectonic plates, allowing comparison of the response of each plate to shaking during great earthquakes. Analyses of the recovered cores show that turbidite sequences associated with a megathrust quake occur on the Juan de Fuca Plate and do not occur in cores collected 90 km away at a similar site on the Explorer Plate. The record of subduction-related earthquake turbidite sequences is not complete at the Juan de Fuca study area and no reconstruction of megathrust quake periodicity is thus possible using this site alone. These results indicate that strong ground shaking is probably not experienced during large subduction earthquakes on the Explorer Plate.

Document Type: Report (Cruise Report)
Open Access Journal?: Yes
DOI etc.: 10.4095/297317
ISSN: 1701-4387
Date Deposited: 05 Oct 2015 08:20
Last Modified: 14 Jan 2016 11:49
URI: http://oceanrep.geomar.de/id/eprint/29909

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