Please use this identifier to cite or link to this item:
http://doi.org/10.25358/openscience-6877
Authors: | Magrini, Fabrizio Boschi, Lapo Gualtieri, Lucia Lekić, Vedran Cammarano, Fabio |
Title: | Rayleigh-wave attenuation across the conterminous United States in the microseism frequency band |
Online publication date: | 11-Apr-2022 |
Year of first publication: | 2021 |
Language: | english |
Abstract: | Mapping variations in the attenuation of seismic energy is important for understanding dissipative mechanisms in the lithosphere, and for modeling ground shaking associated with earthquakes. We cross-correlate ambient seismic signal recorded across the EarthScope Transportable Array in the 3–15 s period range. We apply to the resulting cross correlations a new method to estimate lateral variations in Rayleigh-wave attenuation, as a function of period, beneath North America. Between 3 and 6 s, our maps are dominated by a strong eastward decrease in attenuation. This pattern vanishes at longer periods, confirming early observations based on regional earthquakes. Attenuation maps and phase-velocity maps are anti-correlated at periods between 3 and 6 s, but the anti-correlation is also largely lost at longer periods. This corresponds to the attenuation coefficient decreasing with period more rapidly in the west than in the east, while the change in phase velocity with period is more uniform across the continent. Our results point to a transition in the properties of upper-crustal materials with depth, probably related to the closure of fluid-filled cracks and pores, and imply that measures of attenuation from seismic noise carry significant information on crustal rheology. |
DDC: | 550 Geowissenschaften 550 Earth sciences |
Institution: | Johannes Gutenberg-Universität Mainz |
Department: | FB 09 Chemie, Pharmazie u. Geowissensch. |
Place: | Mainz |
ROR: | https://ror.org/023b0x485 |
DOI: | http://doi.org/10.25358/openscience-6877 |
Version: | Published version |
Publication type: | Zeitschriftenaufsatz |
License: | CC BY |
Information on rights of use: | https://creativecommons.org/licenses/by/4.0/ |
Journal: | Scientific reports 11 |
Pages or article number: | 10149 |
Publisher: | Nature Publishing Group |
Publisher place: | London |
Issue date: | 2021 |
ISSN: | 2045-2322 |
Publisher DOI: | 10.1038/s41598-021-89497-6 |
Appears in collections: | JGU-Publikationen |
Files in This Item:
File | Description | Size | Format | ||
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rayleighwave_attenuation_acro-20220411110640612.pdf | 6.4 MB | Adobe PDF | View/Open |