First seismic record for intra-arc strike-slip tectonics along the 
Liquiñe-Ofqui fault zone at the obliquely convergent plate margin of the 
southern Andes

Lange, D.; Cembrano, J.; Rietbrock, A.; Haberland, Christian; Dahm, Torsten; Bataille, K.

doi:10.1016/j.tecto.2008.04.014

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First seismic record for intra-arc strike-slip tectonics along the Liquiñe-Ofqui fault zone at the obliquely convergent plate margin of the southern Andes

Authors

Lange, D.
External Organizations;
Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum;
GEOFON, Deutsches GeoForschungsZentrum;

Cembrano, J.
External Organizations;
Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum;
GEOFON, Deutsches GeoForschungsZentrum;

Rietbrock, A.
External Organizations;
Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum;
GEOFON, Deutsches GeoForschungsZentrum;

/persons/resource/haber

Haberland, Christian
2.2 Geophysical Deep Sounding, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum;
GEOFON, Deutsches GeoForschungsZentrum;

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Dahm, Torsten
0 Pre-GFZ, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum;
GEOFON, Deutsches GeoForschungsZentrum;

Bataille, K.
External Organizations;
Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum;
GEOFON, Deutsches GeoForschungsZentrum;

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Citation

Lange, D., Cembrano, J., Rietbrock, A., Haberland, C., Dahm, T., Bataille, K. (2008): First seismic record for intra-arc strike-slip tectonics along the Liquiñe-Ofqui fault zone at the obliquely convergent plate margin of the southern Andes. - Tectonophysics, 455, 1-4, 14-24.
https://doi.org/10.1016/j.tecto.2008.04.014

Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_237244

Abstract

A temporal seismic network recorded local seismicity along a 130 km long segment of the transpressional dextral strike-slip Liquiñe-Ofqui fault zone (LOFZ) in southern Chile. Seventy five shallow crustal events with magnitudes up to M(tief)w 3.8 and depths shallower than 25 km were observed in an 11-month period mainly occurring in different clusters. Those clusters are spatially related to the LOFZ, to the volcanoes Chaitén, Michinmahuida and Corcovado, and to active faulting on secondary faults. Further activity along the LOFZ is indicated by individual events located in direct vicinity of the surface expression of the LOFZ. Focal mechanisms were calculated using deviatoric moment tensor inversion of body wave amplitude spectra which mostly yield strike-slip mechanisms indicating a NE–SW direction of the P-axis for the LOFZ at this latitude. The seismic activity reveals the present-day activity of the fault zone. The recent M(tief)w 6.2 event near Puerto Aysén, Southern Chile at 45.4°S on April 21, 2007 shows that the LOFZ is also capable of producing large magnitude earthquakes and therefore imposing significant seismic hazard to this region.