Local earthquake monitoring offshore Valparaiso, Chile.

Thierer, Peter O., Flueh, Ernst R., Kopp, Heidrun , Tilmann, Frederik, Comte, D. and Contreras, S. (2005) Local earthquake monitoring offshore Valparaiso, Chile. Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen, 236 (1-2). pp. 173-183.

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Abstract

On the central Chilean continental margin off Valparaiso a temporary
marine seismological network on the incoming Nazca Plate was supplemented by
the Central Chilean Network and a number of temporary landstations. Simultaneous
inversion of the complete marine earthquake data set yielded hypocenter
distributions from minimum 1-D modeling. These show a considerable seismic activity
within the 15 km - 60 km depth range with a maximum number of events
between 20 km and 40 km. The distribution shows three areas of increased activity:
the O'Higgins Seamount Group on the oceanic plate, the San Antonio Canyon
and the northeastern portion of the Valparaiso Basin. There is a marked difference
in the distance between the trench and the onset of seismic activity between the
San Antonio Canyon area and the Valparaiso Basin area.

Document Type: Article
Keywords: Valparaiso Basin, central Chilean continental margin, earthquake monitoring
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
Open Access Journal?: No
ISSN: 0077-7749
Date Deposited: 03 Dec 2008 16:52
Last Modified: 20 Feb 2017 08:07
URI: http://oceanrep.geomar.de/id/eprint/4625

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