Seismicity and geometry of the south Chilean subduction zone (41.5°S-43.5°S): implications for controlling parameters

Lange, D. and Rietbrock, A. and Haberland, C. and Bataille, K. and Dahm, T. and Tilmann, F. J. and Flüh, E. R. (2007) Seismicity and geometry of the south Chilean subduction zone (41.5°S-43.5°S): implications for controlling parameters. Geophysical Research Letters, 34 (6). L06311. DOI 10.1029/2006GL029190

[img] PDF
Restricted to Registered users only

Download (455kB)


In 2005 an amphibious seismic network was deployed on the Chilean forearc between 41.75°S and 43.25°S. 364 local events were observed in a 11-month period. A subset of the P and S arrival times were inverted for hypocentral coordinates, 1-D velocity structure and station delays. Main seismic activity occurred predominantly in a belt parallel to the coast of Chiloé Island in a depth range of 12–30 km presumably related to the plate interface. The 30° inclination of the shallow part of the Wadati-Benioff zone is similar to observations further north indicating that oceanic plate age is not controlling the subduction angle of the shallower part for the Chilean subduction zone. The down-dip termination of abundant intermediate depth seismicity at approximately 70 km depth seems to be related to the young age (and high temperature) of the oceanic plate. Crustal seismicity is associated with the Liquiñe-Ofqui fault zone and active volcanoes.

Item Type: Article
Uncontrolled Keywords: 2007 AREP IA53 IA54 2007 P
Subjects: 02 - Geodynamics, Geophysics and Tectonics
Divisions: 02 - Geodynamics, Geophysics and Tectonics
Journal or Publication Title: Geophysical Research Letters
Volume: 34
Page Range: L06311
Identification Number: 10.1029/2006GL029190
Depositing User: Sarah Humbert
Date Deposited: 16 Feb 2009 13:02
Last Modified: 23 Jul 2013 10:07

Actions (login required)

View Item View Item

About cookies