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Journal Article

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

Authors
/persons/resource/yjgao

Gao,  Yajian
2.4 Seismology, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/yuan

Yuan,  X.
2.4 Seismology, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/heit

Heit,  B.
2.4 Seismology, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/tilmann

Tilmann,  Frederik
2.4 Seismology, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Herwaarden,  Dirk‐Philip van
External Organizations;

Thrastarson,  Solvi
External Organizations;

Fichtner,  Andreas
External Organizations;

/persons/resource/schurr

Schurr,  B.
4.1 Lithosphere Dynamics, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Fulltext (public)

5008315.pdf
(Publisher version), 3MB

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Citation

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


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5008315
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.