The reflection seismic survey of project TIPTEQ - the inventory of the Chilean 
subduction zone at 38.2° S

Groß, K.; Micksch, U.; and TIPTEQ Research Group, Seismics Team; Araneda, M.; Bataille, K.; Bribach, Jens; Buske, S.; Krawczyk, C. M.; Lüth, Stefan; Mechie, James; Schulze, Albrecht; Shapiro, S. A.; Stiller, Manfred; Wigger, P.; Ziegenhagen, Thomas; CGS Centre for Geological Storage, Geoengineering Centres, GFZ Publication Database, Deutsches GeoForschungsZentrum; 2.4 Seismology, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum; Environmental Geotechnique, Geoengineering Centres, GFZ Publication Database, Deutsches GeoForschungsZentrum

doi:10.1111/j.1365-246X.2007.03680.x

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The reflection seismic survey of project TIPTEQ - the inventory of the Chilean subduction zone at 38.2° S

Authors

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

Micksch, U.
3.1 Lithosphere Dynamics, 3.0 Geodynamics and Geomaterials, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum;

and TIPTEQ Research Group, Seismics Team
External Organizations;
Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum;

Araneda, M.
External Organizations;
Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum;

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

/persons/resource/brib

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

Buske, S.
External Organizations;
Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum;

Krawczyk, C. M.
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Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum;

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Lüth, Stefan
Deutsches GeoForschungsZentrum;
Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum;

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

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Schulze, Albrecht
Deutsches GeoForschungsZentrum;
Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum;

Shapiro, S. A.
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Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum;

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

Wigger, P.
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Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum;

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Ziegenhagen, Thomas
3.1 Lithosphere Dynamics, 3.0 Geodynamics and Geomaterials, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum;

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Citation

Groß, K., Micksch, U., and TIPTEQ Research Group, S. T., Araneda, M., Bataille, K., Bribach, J., Buske, S., Krawczyk, C. M., Lüth, S., Mechie, J., Schulze, A., Shapiro, S. A., Stiller, M., Wigger, P., Ziegenhagen, T. (2008): The reflection seismic survey of project TIPTEQ - the inventory of the Chilean subduction zone at 38.2° S. - Geophysical Journal International, 172, 2, 565-571.
https://doi.org/10.1111/j.1365-246X.2007.03680.x

Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_236927

Abstract

We describe results of an active-source seismology experiment across the Chilean subduction zone at 38.2◦S. The seismic sections clearly show the subducted Nazca plate with varying reflectivity. Below the coast the plate interface occurs at 25 km depth as the sharp lower boundary of a 2–5 km thick, highly reflective region, which we interpret as the subduction channel, that is, a zone of subducted material with a velocity gradient with respect to the upper and lower plate. Further downdip along the seismogenic coupling zone the reflectivity decreases in the area of the presumed 1960 Valdivia hypocentre. The plate interface itself can be traced further down to depths of 50–60 km below the Central Valley. We observe strong reflectivity at the plate interface as well as in the continental mantle wedge. The sections also show a segmented forearc crust in the overriding South American plate. Major features in the accretionary wedge, such as the Lanalhue fault zone, can be identified. At the eastern end of the profile a bright west-dipping reflector lies perpendicular to the plate interface and may be linked to the volcanic arc.