Rayleigh-wave attenuation across the conterminous United States in the microseism frequency band

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...

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Autores principales:	Fabrizio Magrini, Lapo Boschi, Lucia Gualtieri, Vedran Lekić, Fabio Cammarano
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/40cd3166dd524195a4a7b5b948094343
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spelling	oai:doaj.org-article:40cd3166dd524195a4a7b5b9480943432021-12-02T16:50:32ZRayleigh-wave attenuation across the conterminous United States in the microseism frequency band10.1038/s41598-021-89497-62045-2322https://doaj.org/article/40cd3166dd524195a4a7b5b9480943432021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-89497-6https://doaj.org/toc/2045-2322Abstract 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.Fabrizio MagriniLapo BoschiLucia GualtieriVedran LekićFabio CammaranoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Fabrizio Magrini Lapo Boschi Lucia Gualtieri Vedran Lekić Fabio Cammarano Rayleigh-wave attenuation across the conterminous United States in the microseism frequency band
description	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.
format	article
author	Fabrizio Magrini Lapo Boschi Lucia Gualtieri Vedran Lekić Fabio Cammarano
author_facet	Fabrizio Magrini Lapo Boschi Lucia Gualtieri Vedran Lekić Fabio Cammarano
author_sort	Fabrizio Magrini
title	Rayleigh-wave attenuation across the conterminous United States in the microseism frequency band
title_short	Rayleigh-wave attenuation across the conterminous United States in the microseism frequency band
title_full	Rayleigh-wave attenuation across the conterminous United States in the microseism frequency band
title_fullStr	Rayleigh-wave attenuation across the conterminous United States in the microseism frequency band
title_full_unstemmed	Rayleigh-wave attenuation across the conterminous United States in the microseism frequency band
title_sort	rayleigh-wave attenuation across the conterminous united states in the microseism frequency band
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/40cd3166dd524195a4a7b5b948094343
work_keys_str_mv	AT fabriziomagrini rayleighwaveattenuationacrosstheconterminousunitedstatesinthemicroseismfrequencyband AT lapoboschi rayleighwaveattenuationacrosstheconterminousunitedstatesinthemicroseismfrequencyband AT luciagualtieri rayleighwaveattenuationacrosstheconterminousunitedstatesinthemicroseismfrequencyband AT vedranlekic rayleighwaveattenuationacrosstheconterminousunitedstatesinthemicroseismfrequencyband AT fabiocammarano rayleighwaveattenuationacrosstheconterminousunitedstatesinthemicroseismfrequencyband
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Rayleigh-wave attenuation across the conterminous United States in the microseism frequency band

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