Crustal thickness and mantle wedge structure from receiver functions in the Chilean Maule region at 35°S.

Dannowski, Anke, Grevemeyer, Ingo, Kraft, Helene Anja, Arroyo, Ivonne and Thorwart, Martin (2013) Crustal thickness and mantle wedge structure from receiver functions in the Chilean Maule region at 35°S. Tectonophysics, 592 . pp. 159-164. DOI 10.1016/j.tecto.2013.02.015.

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Abstract

A temporary passive seismic network of 21 broad-band stations was deployed in Central Chile between 35°S to 36°S. The network recorded data prior to the magnitude Mw = 8.8 2010 Maule earthquake at a latitude of the major slip and surface deformation. The experiment was conducted to survey crustal and mantle structures and to assess the state of hydration of the mantle wedge. We present results of a teleseismic P receiver function study, supporting a continental Moho at approx. 38 km depth. Phase conversion at this boundary could be observed continuously from the intersection of the subducting slab with the continental Moho towards the Andes. The character of receiver functions indicated little evidence for infiltration of water from the subducting plate into the overlying mantle wedge, suggesting that only a small amount of water is released from the subducting plate. Aftershocks of the Maule earthquake and post-seismic slip reached depths of 50 km and hence slip spread down-dip of the continental Moho in the post-seismic phase. Co-seismic rupture, however, occurred updip of the continental Moho. Spare aftershock seismicity is observed at the intersection of the continental Moho with the subducting slab.

Document Type: Article
Additional Information: WOS:000318136400014
Keywords: Mantle wedge hydration; Receiver function; Crustal structure; Continental Moho; Central Chile; FORE-ARC MANTLE; CENTRAL ANDES; SEISMIC GAP; EARTHQUAKE; SERPENTINIZATION; SUBDUCTION; ARGENTINA; BENEATH; PLATE; MOHO
Research affiliation: OceanRep > SFB 574 > A5
Kiel University
OceanRep > SFB 574
OceanRep > SFB 574 > A2
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.tecto.2013.02.015
ISSN: 0040-1951
Projects: Future Ocean
Contribution Number:
ProjectNumber
SFB 574241
Date Deposited: 05 Mar 2013 11:40
Last Modified: 24 Oct 2016 10:00
URI: http://oceanrep.geomar.de/id/eprint/20658

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