Castellanos, Jorge C. and Humphreys, Eugene and Clayton, Robert W. (2022) Evidence of Mantle‐Based Deformation Across the Western United States. Geophysical Research Letters, 49 (4). Art. No. e2021GL094854. ISSN 0094-8276. doi:10.1029/2021gl094854. https://resolver.caltech.edu/CaltechAUTHORS:20220225-724794000
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Abstract
We investigate the role that upper mantle buoyancy anomalies play in determining the behavior of the crust. Recently, Castellanos et al. (2020; https://doi.org/10.1126/sciadv.abb0476) observed that the anisotropy of the Pacific Northwest (PNW) crust correlates with the upper-mantle velocity structure and suggested that vertical loads in the upper mantle can displace the Moho and drive crustal flow on a regional scale. To provide further insight into this relation, we resolve the crustal anisotropy in regions where near-surface mantle-based deformation might have occurred or is presently occurring. Specifically, we focus on the crust around the Rocky Mountains and around California since high-resolution tomographic images reveal the presence of mantle structures similar to the ones that are thought to be driving the crust in the PNW. Our results reveal crustal flow driven by mantle vertical loading in both regions and suggest that this mechanism may be key in maintaining crustal isostasy during an orogeny.
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| Additional Information: | © 2022. American Geophysical Union. Issue Online: 21 February 2022. Version of Record online: 21 February 2022. Accepted manuscript online: 04 February 2022. Manuscript accepted: 26 January 2022. Manuscript revised: 21 January 2022. Manuscript received: 21 June 2021. The research was partially supported by NSF/EAR-1546635 and NSF/EAR-1727451. The figures presented in this paper were made using the Generic Mapping Tools version 4.5.9 (https://www.soest.hawaii.edu/gmt/). Data Availability Statement. All the seismic data used in this investigation is available from the IRIS-DMC (http://ds.iris.edu/ds/nodes/dmc/data/). | |||||||||
| Group: | Seismological Laboratory | |||||||||
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| Subject Keywords: | mantle dynamics; crustal flow; seismic anisotropy | |||||||||
| Issue or Number: | 4 | |||||||||
| DOI: | 10.1029/2021gl094854 | |||||||||
| Record Number: | CaltechAUTHORS:20220225-724794000 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20220225-724794000 | |||||||||
| Official Citation: | Castellanos, J. C., Humphreys, E., & Clayton, R. W. (2022). Evidence of mantle-based deformation across the western United States. Geophysical Research Letters, 49, e2021GL094854. https://doi.org/10.1029/2021GL094854 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 113619 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | George Porter | |||||||||
| Deposited On: | 25 Feb 2022 22:53 | |||||||||
| Last Modified: | 25 Feb 2022 22:53 |
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