Temporal variation in scattering and intrinsic attenuation due to earthquakes in East Asia

Abstract Separated attenuation values have not been used in post-seismic variation research, although the scattering attenuation (Q s −1) parameter that can be used to estimate crustal inhomogeneity due to cracks. In this study, three earthquakes that occurred in Kumamoto (M7.3), Tottori (M6.6), and...

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Autores principales:	Muhammad Zafar Iqbal, Tae Woong Chung, Myung Jin Nam, Kazuo Yoshimoto
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d2f1a98323d34a2584ce5b81857accb9
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spelling	oai:doaj.org-article:d2f1a98323d34a2584ce5b81857accb92021-12-02T15:00:20ZTemporal variation in scattering and intrinsic attenuation due to earthquakes in East Asia10.1038/s41598-021-90781-82045-2322https://doaj.org/article/d2f1a98323d34a2584ce5b81857accb92021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-90781-8https://doaj.org/toc/2045-2322Abstract Separated attenuation values have not been used in post-seismic variation research, although the scattering attenuation (Q s −1) parameter that can be used to estimate crustal inhomogeneity due to cracks. In this study, three earthquakes that occurred in Kumamoto (M7.3), Tottori (M6.6), and Gyeongju (M5.8) in 2016 were investigated by applying a multiple lapse time window analysis to seismograms recorded before and after the events. At a low frequency, significantly greater variation of the Q s −1 value was observed than the intrinsic attenuation (Q i −1) for the Kumamoto earthquake, whereas similarly large variation was observed for the Gyeongju earthquake. For the surrounding Kumamoto earthquake area of increased attenuation, even higher decreases in Q s –1 and Q i –1 were also observed. The increases occurred within a two year-period after mainshock. The large increases in attenuation, corresponding to regions with high peak ground acceleration, were limited to the basin area with an elevation below 500 m. Furthermore, post-seismic increases in attenuation values were found to correlate with the magnitude and length of the quiet periods of the earthquakes. From this study, Q s –1 and Q i –1 were shown as new parameters that can quantitatively measure the post-seismic deformation due to crustal earthquake.Muhammad Zafar IqbalTae Woong ChungMyung Jin NamKazuo YoshimotoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Muhammad Zafar Iqbal Tae Woong Chung Myung Jin Nam Kazuo Yoshimoto Temporal variation in scattering and intrinsic attenuation due to earthquakes in East Asia
description	Abstract Separated attenuation values have not been used in post-seismic variation research, although the scattering attenuation (Q s −1) parameter that can be used to estimate crustal inhomogeneity due to cracks. In this study, three earthquakes that occurred in Kumamoto (M7.3), Tottori (M6.6), and Gyeongju (M5.8) in 2016 were investigated by applying a multiple lapse time window analysis to seismograms recorded before and after the events. At a low frequency, significantly greater variation of the Q s −1 value was observed than the intrinsic attenuation (Q i −1) for the Kumamoto earthquake, whereas similarly large variation was observed for the Gyeongju earthquake. For the surrounding Kumamoto earthquake area of increased attenuation, even higher decreases in Q s –1 and Q i –1 were also observed. The increases occurred within a two year-period after mainshock. The large increases in attenuation, corresponding to regions with high peak ground acceleration, were limited to the basin area with an elevation below 500 m. Furthermore, post-seismic increases in attenuation values were found to correlate with the magnitude and length of the quiet periods of the earthquakes. From this study, Q s –1 and Q i –1 were shown as new parameters that can quantitatively measure the post-seismic deformation due to crustal earthquake.
format	article
author	Muhammad Zafar Iqbal Tae Woong Chung Myung Jin Nam Kazuo Yoshimoto
author_facet	Muhammad Zafar Iqbal Tae Woong Chung Myung Jin Nam Kazuo Yoshimoto
author_sort	Muhammad Zafar Iqbal
title	Temporal variation in scattering and intrinsic attenuation due to earthquakes in East Asia
title_short	Temporal variation in scattering and intrinsic attenuation due to earthquakes in East Asia
title_full	Temporal variation in scattering and intrinsic attenuation due to earthquakes in East Asia
title_fullStr	Temporal variation in scattering and intrinsic attenuation due to earthquakes in East Asia
title_full_unstemmed	Temporal variation in scattering and intrinsic attenuation due to earthquakes in East Asia
title_sort	temporal variation in scattering and intrinsic attenuation due to earthquakes in east asia
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/d2f1a98323d34a2584ce5b81857accb9
work_keys_str_mv	AT muhammadzafariqbal temporalvariationinscatteringandintrinsicattenuationduetoearthquakesineastasia AT taewoongchung temporalvariationinscatteringandintrinsicattenuationduetoearthquakesineastasia AT myungjinnam temporalvariationinscatteringandintrinsicattenuationduetoearthquakesineastasia AT kazuoyoshimoto temporalvariationinscatteringandintrinsicattenuationduetoearthquakesineastasia
_version_	1718389165857439744

Temporal variation in scattering and intrinsic attenuation due to earthquakes in East Asia

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