Journal
CONTINENTAL SHELF RESEARCH
Volume 31, Issue 3-4, Pages 154-161Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.csr.2010.05.008
Keywords
Aysen Fjord Chile; Liquine-Ofqui Fault; Volcanic swarm; b-Value; Monogenetic volcano
Categories
Funding
- Proyecto Fondecyt, Conicyt, Chile [1061253]
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A seismic swarm of more than 7200 earthquakes occurred in Aysen Fjord, southern Chile, from January to June 2007. It started suddenly on 23 January 2007 with an earthquake of magnitude Mw=5.3, followed by five earthquakes with magnitudes increasing from Mw=5.2 to 6.2 within three months. Two large earthquakes of magnitudes Mw=6.1 and 6.2 occurred on 02 and 21 April 2007, respectively. The latest earthquake generated landslides that induced a tsunami within the ford, killing 10 people. This swarm has been examined using international seismic catalogues and seismicity located with a local seismic network; in particular its double tectonic and volcanic origin has been explored. All the focal mechanisms are compatible with the long- and short-term tectonics of the Liquine-Ofqui Fault Zone, a major intra-arc fault system of the Patagonian fjord land. The space, time, and size distributions of these earthquakes, that occurred within an active volcanic area revealed by the presence of several Holocene monogenetic volcanoes, may be explained both by fluid-induced (magma and/or hydrothermal fluids) activity combined with tectonic activity. The co-existence of these two tectonic and volcanic phenomena is a good example of retroactive links between fluids and tectonic fractures. (C) 2010 Elsevier Ltd. All rights reserved.
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