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  Structure of the seismogenic zone of the southcentral Chilean margin revealed by local earthquake traveltime tomography

Haberland, C., Rietbrock, A., Lange, D., Bataille, K., Dahm, T. (2009): Structure of the seismogenic zone of the southcentral Chilean margin revealed by local earthquake traveltime tomography. - Journal of Geophysical Research, 114, B01317.
https://doi.org/10.1029/2008JB005802

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Haberland, Christian1, 2, Autor              
Rietbrock, A.2, 3, Autor
Lange, D.2, 3, Autor
Bataille, K.2, 3, Autor
Dahm, Torsten2, 4, Autor              
Affiliations:
12.2 Geophysical Deep Sounding, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_66027              
2Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum, Potsdam, ou_44021              
3External Organizations, ou_persistent22              
40 Pre-GFZ, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146023              

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 DDC: 550 - Earth sciences
 Zusammenfassung: We use traveltime data of local earthquakes and controlled sources observed by a large, temporary, amphibious seismic network to reveal the anatomy of the southcentral Chilean subduction zone (37–39°S) between the trench and the magmatic arc. At this location the giant 1960 earthquake (M = 9.5) nucleated and ruptured almost 1000 km of the subduction megathrust. For the three-dimensional tomographic inversion we used 17,148 P wave and 10,049 S wave arrival time readings from 439 local earthquakes and 94 shots. The resolution of the tomographic images was explored by analyzing the model resolution matrix and conducting extensive numerical tests. The downgoing lithosphere is delineated by high seismic P wave velocities. High v p/v s ratio in the subducting slab reflects hydrated oceanic crust and serpentinized uppermost oceanic mantle. The subducting oceanic crust can be traced down to a depth of 80 km, as indicated by a low velocity channel. The continental crust extends to approximately a 50-km depth near the intersection with the subducting plate. This suggests a wide contact zone between continental and oceanic crust of about 150 km, potentially supporting the development of large asperities. Eastward the crustal thickness decreases again to a minimum of about a 30-km depth. Relatively low v p/v s at the base of the forearc does not support a large-scale serpentinization of the mantle wedge. Offshore, low v p and high v p/v s reflect young, fluid-saturated sediments of forearc basins and the accretionary prism.

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Sprache(n): eng - Englisch
 Datum: 2009
 Publikationsstatus: Final veröffentlicht
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 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: eDoc: 12713
GFZPOF: PT1 Planet Earth: Global Processes and Change
GFZPOF: PT2 Earth System Dynamics: Coupled Processes and Regional Impact
DOI: 10.1029/2008JB005802
 Art des Abschluß: -

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Titel: Journal of Geophysical Research
Genre der Quelle: Zeitschrift, SCI, Scopus
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Seiten: - Band / Heft: 114 Artikelnummer: B01317 Start- / Endseite: - Identifikator: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals268