Subducting seamounts control interplate coupling and seismic rupture in the 2014 Iquique earthquake area

Geersen, Jacob M., Ranero, César R., Barckhausen, Udo and Reichert, Christian (2015) Subducting seamounts control interplate coupling and seismic rupture in the 2014 Iquique earthquake area Nature Communications, 6 . p. 8267. DOI 10.1038/ncomms9267.

[img]
Preview
Text
ncomms9267.pdf - Published Version
Available under License ["licenses_description_cc_by_4.0" not defined].

Download (3186Kb) | Preview

Supplementary data:

Abstract

To date, the parameters that determine the rupture area of great subduction zone earthquakes remain contentious. On 1 April 2014, the Mw 8.1 Iquique earthquake ruptured a portion of the well-recognized northern Chile seismic gap but left large highly coupled areas un-ruptured. Marine seismic reflection and swath bathymetric data indicate that structural variations in the subducting Nazca Plate control regional-scale plate-coupling variations, and the limited extent of the 2014 earthquake. Several under-thrusting seamounts correlate to the southward and up-dip arrest of seismic rupture during the 2014 Iquique earthquake, thus supporting a causal link. By fracturing of the overriding plate, the subducting seamounts are likely further responsible for reduced plate-coupling in the shallow subduction zone and in a lowly coupled region around 20.5°S. Our data support that structural variations in the lower plate influence coupling and seismic rupture offshore Northern Chile, whereas the structure of the upper plate plays a minor role.

Document Type: Article
Keywords: 2014 Iquique earthquake, seamount subduction, northern chile, seismic gap, plate coupling, seismic rupture, RV Sonne, SO104
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > The Future Ocean - Cluster of Excellence > FO-R06
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
DOI etc.: 10.1038/ncomms9267
ISSN: 2041-1723
Projects: Future Ocean
Expeditions/Models:
Date Deposited: 01 Oct 2015 07:26
Last Modified: 19 Dec 2017 12:51
URI: http://eprints.uni-kiel.de/id/eprint/29858

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...