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  • English  (2)
  • 2000-2004  (2)
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  • English  (2)
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  • 1
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    Deep seismic structure of the Atacama basin, northern Chile (2004)
    In:  Geophysical Research Letters
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    Publication Date: 2020-02-12
    Description: The Atacama basin is a prominent morphological anomaly in the Central Andean forearc. 3D seismic structure beneath the depression and its surroundings has been determined from local earthquake tomography. Depth maps of P-wave velocity and attenuation (1/Q p ) through the lithosphere reveal a rheologically strong (high Q p and v p ) lithospheric block beneath the basin, surrounded by weak regions (low Q p and v p ) beneath Pre- and Western Cordilleras. The anomalous lithospheric structure appears to bar hot asthenospheric mantle from penetrating trenchward, and hence causes the volcanic front to be deflected by the Salar de Atacama basin. The cold block may also influence the thermal structure of the subducted slab causing reduced Benioff seismicity and less hydration of mantle rocks evident from reduced v p /v s ratios. Seismic data are hard to reconcile with extension and lithospheric thinning as a mechanism for subsidence of the basin. Instead, high strength of the Atacama lithospheric block may contribute to basin formation by focussing deformation and uplift along the block's weak edges.
    Language: English
    Type: info:eu-repo/semantics/article
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  • 2
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    Seismic structure of the central Andean subduction zone from local earthquake data (2001)
    Deutsches GeoForschungsZentrum GFZ
    In:  Scientific Technical Report STR
    Details
    Publication Date: 2021-08-08
    Description: In this thesis the subduction zone of the Central Andes is studied. The Andes have formed in a complex interplay of subduction related and tectonic processes. The Central Andes with the associated Altiplano-Puna high plateau constitute the second largest continental land-mass on earth, rivaled only by the Tibetan highland. Whereas in the case of the Himalayas , where two buoyant continental plates collide, crustal thickening and uplift is quite intuitive, processes leading to formation of a plateau above a subduction zone are puzzling.
    Language: English
    Type: info:eu-repo/semantics/doctoralThesis
    Format: application/pdf
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