Subducted Lithosphere Under South America From Multifrequency P Wave Tomography

We analyze mantle structure under South America in the DETOX‐P1 seismic tomography model, a global‐scale, multifrequency inversion of teleseismic P waves. DETOX‐P1 inverts the most extensive data set of broadband, waveform‐based traveltime measurements to date, complemented by analyst‐picked travelt...

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Bibliographic Details
Published in:Journal of geophysical research. Solid earth 2021-06, Vol.126 (6), p.n/a
Main Authors: Mohammadzaheri, Afsaneh, Sigloch, Karin, Hosseini, Kasra, Mihalynuk, Mitchell G.
Format: Article
Language:English
Subjects:
Andes
Broadband
Cenozoic
Continental margins
Cretaceous
Deformation
Depth
Earth Sciences
Elastic waves
Engineering Sciences
Environmental Sciences
Geophysics
Instrumentation and Detectors
intra‐arc
intra‐oceanic subduction
Jurassic
Lithosphere
Magma
Ocean floor
Oceanic trenches
Offshore
P waves
Physics
Provinces
Reconfiguration
Sciences of the Universe
Seismic tomography
Signal and Image processing
Slabs
South America
Stations
structure of the mantel
Subduction
Subduction (geology)
Tectonics
Tomography
Transition zone
Travel time
Waveforms
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Summary:We analyze mantle structure under South America in the DETOX‐P1 seismic tomography model, a global‐scale, multifrequency inversion of teleseismic P waves. DETOX‐P1 inverts the most extensive data set of broadband, waveform‐based traveltime measurements to date, complemented by analyst‐picked traveltimes from the ISC‐EHB catalog. The mantle under South America is sampled by ∼665,000 cross‐correlation traveltimes measured on 529 South American broadband stations and on 5,389 stations elsewhere. By their locations, depths, and geometries, we distinguish four high‐velocity provinces under South America, interpreted as subducted lithosphere (“slabs”). The deepest (∼1,800–1,200 km depth) and shallowest (
ISSN:2169-9313
2169-9356
DOI:10.1029/2020JB020704