Lateral Variation of Crustal Lg Attenuation in Eastern North America

Abstract We perform Q Lg tomography for the northeastern part of North America. Vertical broadband seismograms of 473 crustal earthquakes recorded by 302 stations are processed to extract the Lg amplitude spectra. Tomographic inversions are independently conducted at 58 discrete frequencies distribu...

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Autores principales:	Lian-Feng Zhao, S. Mostafa Mousavi
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/98e326aca9f14fda88ca260d0bea1896
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spelling	oai:doaj.org-article:98e326aca9f14fda88ca260d0bea18962021-12-02T11:40:55ZLateral Variation of Crustal Lg Attenuation in Eastern North America10.1038/s41598-018-25649-52045-2322https://doaj.org/article/98e326aca9f14fda88ca260d0bea18962018-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-25649-5https://doaj.org/toc/2045-2322Abstract We perform Q Lg tomography for the northeastern part of North America. Vertical broadband seismograms of 473 crustal earthquakes recorded by 302 stations are processed to extract the Lg amplitude spectra. Tomographic inversions are independently conducted at 58 discrete frequencies distributed evenly in log space between 0.1 and 20.0 Hz. This relatively large dataset with good ray coverage allows us to image lateral variation of the crustal attenuation over the region. Obtained Q Lg maps at broadband and individual frequencies provide new insights into the crustal attenuation of the region and its relationship to geological structures and past tectonic activity in the area. The Q Lg shows more uniform values over the older, colder, and drier Canadian Shield, in contrast to higher variations in the younger margins. Results confirm the correlation of large-scale variations with crustal geological features in the area. Existence of low-velocity anomalies, thick sediments, volcanic rocks, and thin oceanic crust are potential sources of observed anomalies. The mean Q values are inversely correlated with average heat flow/generation for main geological provinces.Lian-Feng ZhaoS. Mostafa MousaviNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-16 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Lian-Feng Zhao S. Mostafa Mousavi Lateral Variation of Crustal Lg Attenuation in Eastern North America
description	Abstract We perform Q Lg tomography for the northeastern part of North America. Vertical broadband seismograms of 473 crustal earthquakes recorded by 302 stations are processed to extract the Lg amplitude spectra. Tomographic inversions are independently conducted at 58 discrete frequencies distributed evenly in log space between 0.1 and 20.0 Hz. This relatively large dataset with good ray coverage allows us to image lateral variation of the crustal attenuation over the region. Obtained Q Lg maps at broadband and individual frequencies provide new insights into the crustal attenuation of the region and its relationship to geological structures and past tectonic activity in the area. The Q Lg shows more uniform values over the older, colder, and drier Canadian Shield, in contrast to higher variations in the younger margins. Results confirm the correlation of large-scale variations with crustal geological features in the area. Existence of low-velocity anomalies, thick sediments, volcanic rocks, and thin oceanic crust are potential sources of observed anomalies. The mean Q values are inversely correlated with average heat flow/generation for main geological provinces.
format	article
author	Lian-Feng Zhao S. Mostafa Mousavi
author_facet	Lian-Feng Zhao S. Mostafa Mousavi
author_sort	Lian-Feng Zhao
title	Lateral Variation of Crustal Lg Attenuation in Eastern North America
title_short	Lateral Variation of Crustal Lg Attenuation in Eastern North America
title_full	Lateral Variation of Crustal Lg Attenuation in Eastern North America
title_fullStr	Lateral Variation of Crustal Lg Attenuation in Eastern North America
title_full_unstemmed	Lateral Variation of Crustal Lg Attenuation in Eastern North America
title_sort	lateral variation of crustal lg attenuation in eastern north america
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/98e326aca9f14fda88ca260d0bea1896
work_keys_str_mv	AT lianfengzhao lateralvariationofcrustallgattenuationineasternnorthamerica AT smostafamousavi lateralvariationofcrustallgattenuationineasternnorthamerica
_version_	1718395532091588608

Lateral Variation of Crustal Lg Attenuation in Eastern North America

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