Source-side shear wave splitting and upper mantle flow in the Chile Ridge subduction region
Abstract
The actively spreading Chile Ridge has been subducting beneath Patagonian Chile since the Middle Miocene. After subduction, continued separation of the faster Nazca plate from the slow Antarctic plate has opened up a gap—a slab window—between the subducted oceanic lithospheres beneath South America. We examined the form of the asthenospheric mantle flow in the vicinity of this slab window using S waves from six isolated, unusual 2007 earthquakes that occurred in the generally low-seismicity region just north of the ridge subduction region. The S waves from these earthquakes were recorded at distant seismic stations, but were split into fast and slow orthogonally polarized waves at upper mantle depths during their passage through the slab window and environs. We isolated the directions of fast split shear waves near the slab window by correcting for upper mantle seismic anisotropy at the distant stations. The results show that the generally trench-parallel upper mantle flow beneath the Nazca plate rotates to an ENE trend in the neighborhood of the slab gap, consistent with upper mantle flow from west to east through the slab window.
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The southern Patagonian Andes are located above a transition zone between the subducting Antarctic and Nazca plates and a wide asthenospheric window where hot buoyant asthenospheric mantle upwells.
“The southern Patagonian Andes in the South American continent are located above a transition zone between the subducting Antarctic and Nazca plates and a wide asthenospheric window where hot buoyant asthenospheric mantle upwells (Fig. 1a; Cande and Leslie, 1986;Breitsprecher and Thorkelson, 2009;Russo et al., 2010Russo et al., , 2022;;Dávila et al., 2018;Ávila andDávila, 2018, 2020;Mark et al., 2”
From Fast uplift in the southern Patagonian Andes due to long- and short-term deglaciation and the asthenospheric window underneath (2024) · cites this paper as Russo et al., 2010
Increased asthenospheric temperatures beneath southern Patagonia are highly supported by geophysical data.
“increased asthenospheric temperatures beneath southern Patagonia are highly supported by the geophysical data”
From Fast uplift in the southern Patagonian Andes due to long- and short-term deglaciation and the asthenospheric window underneath (2024) · cites this paper as Russo et al., 2010
The thermo-mechanical visco-elastoplastic forward modelling approach helps to constrain the increase in temperature in geodynamic asthenospheric upwelling contexts, such as in southern Patagonia.
“Our thermo-mechanical visco-elastoplastic forward modelling approach thus helps to constrain the increase in temperature in geodynamic asthenospheric upwelling contexts, such as in southern Patagonia”
From Fast uplift in the southern Patagonian Andes due to long- and short-term deglaciation and the asthenospheric window underneath (2024) · cites this paper as Russo et al., 2010
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References 35 · Cited by 74
- Authors
- Russo, R. M., Gallego, A., Comte, D., Mocanu, V. I., Murdie, R. E., & VanDecar, J. C.
- Affiliations
- University of Florida (US)
- University of Chile (CL)
- University of Bucharest (RO)
- Carnegie Institution for Science (US)
- Corresponding author
- Russo, R.M.
- Venue
- Geology
- Publisher
- Geological Society of America
- Published
- 2010-08
- Volume
- 38
- Issue
- 8
- Pages
- 707-710
- ISSN
- 0091-7613 (ISSN-L)
- 1943-2682
- OpenAlex
- W2160565549
- Cited by
- 74
- References
- 35
- Citations by year
- 2026: 2 · 2025: 4 · 2024: 6 · 2023: 5 · 2022: 9 · 2021: 2 · 2020: 6 · 2019: 8 · 2018: 3 · 2017: 3 · 2016: 6 · 2015: 1 · 2014: 7 · 2013: 3 · 2012: 5
- FWCI
- 3.49
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Geology (publishedVersion)
- Publication Database GFZ (GFZ German Research Centre for Geosciences) (submittedVersion)
- Funders
- National Science Foundation
- Comisión Nacional de Investigación Científica y Tecnológica
- Topics
- Physical Sciences › Earth and Planetary Sciences › Geophysics › High-pressure geophysics and materials
- Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Tectonic Studies in Latin America
- Physical Sciences › Earth and Planetary Sciences › Geophysics › earthquake and tectonic studies
- Keywords
- shear wave splitting, upper mantle flow, slab window, Nazca plate, Antarctic plate, S-wave anisotropy, 2007 earthquake, subduction zone
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