Temporal variations in coda attenuation associated with the 2008 Wenchuan (MW7.9) Earthquake in SW, China

In this study, waveform data obtained from Western Sichuan Seismic Array (WSSA) in China was utilized to reveal the temporal variations in coda attenuation around the eastern Tibet Plateau and Western Sichuan. Based on the single-scattering model, coda attenuation factor Qc−1 is calculated in narrow...

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Autores principales:	Junhua Hu, Guoxin Zhang, Liyun Fu, Yan Zhang, Songhui Li
Formato:	article
Lenguaje:	EN
Publicado:	KeAi Communications Co., Ltd. 2021
Materias:	Wenchuan earthquake Single-scattering model Coda attenuation Tectonic static stress Geodesy QB275-343 Geophysics. Cosmic physics QC801-809
Acceso en línea:	https://doaj.org/article/077ae894c50d44a9ae64d68bcda1e133
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id	oai:doaj.org-article:077ae894c50d44a9ae64d68bcda1e133
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spelling	oai:doaj.org-article:077ae894c50d44a9ae64d68bcda1e1332021-11-18T04:46:12ZTemporal variations in coda attenuation associated with the 2008 Wenchuan (MW7.9) Earthquake in SW, China1674-984710.1016/j.geog.2021.09.001https://doaj.org/article/077ae894c50d44a9ae64d68bcda1e1332021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1674984721000665https://doaj.org/toc/1674-9847In this study, waveform data obtained from Western Sichuan Seismic Array (WSSA) in China was utilized to reveal the temporal variations in coda attenuation around the eastern Tibet Plateau and Western Sichuan. Based on the single-scattering model, coda attenuation factor Qc−1 is calculated in narrower overlapping frequency bands at 1.0–24 Hz by measuring the coda decay rates for local earthquakes before and after the Wenchuan mainshock. The temporal variations in coda attenuation are investigated within three periods. The period I lasted from January 2007 to the end of 2007. The period II lasted from January 2008 till Wenchuan earthquake. The period III lasted from the mainshock to the end of 2008. The resulted temporal variations demonstrate an increase in average Qc−1 by approximately 35%–45% in the vicinity of Longmenshan and 30%–35% in Sichuan Basin after the Wenchuan earthquake in lower frequency bands within 1.25–8 Hz. On the contrary, the average Qc−1 is shown to decrease by approximately 10%–18% in southern segment of Longmenshan, 15%–38% in the Chuan-Dian block, and 10–12% in the South China block. These results are confirmed by a statistical t-test at 99.9% confidence level. No statistically significant change in Qc−1 (<10%) is found in the Songpan-Ganzi block after the mainshock. Temporal variations of coda attenuation differ significantly in individual blocks after the mainshock. The coda attenuation is proposed to be a beacon to tectonic static stress changes associated with the Wenchuan earthquake.Junhua HuGuoxin ZhangLiyun FuYan ZhangSonghui LiKeAi Communications Co., Ltd.articleWenchuan earthquakeSingle-scattering modelCoda attenuationTectonic static stressGeodesyQB275-343Geophysics. Cosmic physicsQC801-809ENGeodesy and Geodynamics, Vol 12, Iss 6, Pp 424-440 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Wenchuan earthquake Single-scattering model Coda attenuation Tectonic static stress Geodesy QB275-343 Geophysics. Cosmic physics QC801-809
spellingShingle	Wenchuan earthquake Single-scattering model Coda attenuation Tectonic static stress Geodesy QB275-343 Geophysics. Cosmic physics QC801-809 Junhua Hu Guoxin Zhang Liyun Fu Yan Zhang Songhui Li Temporal variations in coda attenuation associated with the 2008 Wenchuan (MW7.9) Earthquake in SW, China
description	In this study, waveform data obtained from Western Sichuan Seismic Array (WSSA) in China was utilized to reveal the temporal variations in coda attenuation around the eastern Tibet Plateau and Western Sichuan. Based on the single-scattering model, coda attenuation factor Qc−1 is calculated in narrower overlapping frequency bands at 1.0–24 Hz by measuring the coda decay rates for local earthquakes before and after the Wenchuan mainshock. The temporal variations in coda attenuation are investigated within three periods. The period I lasted from January 2007 to the end of 2007. The period II lasted from January 2008 till Wenchuan earthquake. The period III lasted from the mainshock to the end of 2008. The resulted temporal variations demonstrate an increase in average Qc−1 by approximately 35%–45% in the vicinity of Longmenshan and 30%–35% in Sichuan Basin after the Wenchuan earthquake in lower frequency bands within 1.25–8 Hz. On the contrary, the average Qc−1 is shown to decrease by approximately 10%–18% in southern segment of Longmenshan, 15%–38% in the Chuan-Dian block, and 10–12% in the South China block. These results are confirmed by a statistical t-test at 99.9% confidence level. No statistically significant change in Qc−1 (<10%) is found in the Songpan-Ganzi block after the mainshock. Temporal variations of coda attenuation differ significantly in individual blocks after the mainshock. The coda attenuation is proposed to be a beacon to tectonic static stress changes associated with the Wenchuan earthquake.
format	article
author	Junhua Hu Guoxin Zhang Liyun Fu Yan Zhang Songhui Li
author_facet	Junhua Hu Guoxin Zhang Liyun Fu Yan Zhang Songhui Li
author_sort	Junhua Hu
title	Temporal variations in coda attenuation associated with the 2008 Wenchuan (MW7.9) Earthquake in SW, China
title_short	Temporal variations in coda attenuation associated with the 2008 Wenchuan (MW7.9) Earthquake in SW, China
title_full	Temporal variations in coda attenuation associated with the 2008 Wenchuan (MW7.9) Earthquake in SW, China
title_fullStr	Temporal variations in coda attenuation associated with the 2008 Wenchuan (MW7.9) Earthquake in SW, China
title_full_unstemmed	Temporal variations in coda attenuation associated with the 2008 Wenchuan (MW7.9) Earthquake in SW, China
title_sort	temporal variations in coda attenuation associated with the 2008 wenchuan (mw7.9) earthquake in sw, china
publisher	KeAi Communications Co., Ltd.
publishDate	2021
url	https://doaj.org/article/077ae894c50d44a9ae64d68bcda1e133
work_keys_str_mv	AT junhuahu temporalvariationsincodaattenuationassociatedwiththe2008wenchuanmw79earthquakeinswchina AT guoxinzhang temporalvariationsincodaattenuationassociatedwiththe2008wenchuanmw79earthquakeinswchina AT liyunfu temporalvariationsincodaattenuationassociatedwiththe2008wenchuanmw79earthquakeinswchina AT yanzhang temporalvariationsincodaattenuationassociatedwiththe2008wenchuanmw79earthquakeinswchina AT songhuili temporalvariationsincodaattenuationassociatedwiththe2008wenchuanmw79earthquakeinswchina
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Temporal variations in coda attenuation associated with the 2008 Wenchuan (MW7.9) Earthquake in SW, China

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