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  Impact of the Juan Fernandez ridge on the Pampean flat subduction inferred from full waveform inversion

Gao, Y., Yuan, X., Heit, B., Tilmann, F., Herwaarden, D. v., Thrastarson, S., Fichtner, A., Schurr, B. (2021): Impact of the Juan Fernandez ridge on the Pampean flat subduction inferred from full waveform inversion. - Geophysical Research Letters, 48, 21, e2021GL095509.
https://doi.org/10.1029/2021GL095509

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 Creators:
Gao, Yajian1, Author              
Yuan, X.1, Author              
Heit, B.1, Author              
Tilmann, Frederik1, Author              
Herwaarden, Dirk‐Philip van2, Author
Thrastarson, Solvi2, Author
Fichtner, Andreas2, Author
Schurr, B.3, Author              
Affiliations:
12.4 Seismology, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_30023              
2External Organizations, ou_persistent22              
34.1 Lithosphere Dynamics, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146034              

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 Abstract: A new seismic model for crust and upper mantle of the south Central Andes is derived from full waveform inversion, covering the Pampean flat subduction and adjacent Payenia steep subduction segments. Focused crustal low-velocity anomalies indicate partial melts in the Payenia segment along the volcanic arc, whereas weaker low-velocity anomalies covering a wide zone in the Pampean segment are interpreted as remnant partial melts. Thinning and tearing of the flat Nazca slab is inferred from gaps in the slab along the inland projection of the Juan-Fernandez-Ridge. A high-velocity anomaly in the mantle below the flat slab is interpreted as relic Nazca slab segment, which indicates an earlier slab break-off triggered by the buoyancy of the Juan-Fernandez-Ridge during the flattening process. In Payenia, large-scale low-velocity anomalies atop and below the re-steepened Nazca slab are associated with the re-opening of the mantle wedge and sub-slab asthenospheric flow, respectively.

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 Dates: 2021-10-162021
 Publication Status: Finally published
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 Identifiers: DOI: 10.1029/2021GL095509
GFZPOF: p4 T3 Restless Earth
GFZPOFWEITERE: p4 MESI
OATYPE: Hybrid - DEAL Wiley
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Title: Geophysical Research Letters
Source Genre: Journal, SCI, Scopus
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Pages: - Volume / Issue: 48 (21) Sequence Number: e2021GL095509 Start / End Page: - Identifier: ISSN: 1944-8007
ISSN: 0094-8276
CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals182
Publisher: American Geophysical Union (AGU)