Study on the characteristic mechanisms of infrasonic precursors during the damage process of impending earthquake sources.

Infrasonic signals measured before an earthquake carry information about the size and development speed of the source fracture, the stress at the fracture site and the elastic properties of the geologic medium. The infrasonic signal has a stable time scale, and compared with other precursors, infras...

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Autores principales:	Wei Wang, Xiaorong Xue, Weisheng Chen, Xiaoyan Xue
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/9750cd75aee446b4ab8842728aadd1a7
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spelling	oai:doaj.org-article:9750cd75aee446b4ab8842728aadd1a72021-12-02T20:13:51ZStudy on the characteristic mechanisms of infrasonic precursors during the damage process of impending earthquake sources.1932-620310.1371/journal.pone.0257345https://doaj.org/article/9750cd75aee446b4ab8842728aadd1a72021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0257345https://doaj.org/toc/1932-6203Infrasonic signals measured before an earthquake carry information about the size and development speed of the source fracture, the stress at the fracture site and the elastic properties of the geologic medium. The infrasonic signal has a stable time scale, and compared with other precursors, infrasound has a unique sensitivity to earthquake disasters. However, to date, there has been no relevant theoretical research on the mechanism of infrasonic anomalies, and information on the development of fracture sources cannot be obtained from these characteristics, which makes the application of this anomaly in earthquake prediction challenging. In this study, we obtained the characteristics of short-term and impending infrasonic anomalies based on the infrasound data of more than 100 strong earthquakes. With a range of elastic medium models with a large number of fractures, we completed the theoretical simulation of the formation process of infrasonic precursors during the formation of the main fractures, analyzed the physical evolution of acoustic signals when cracks are generated, and quantitatively described the stages of large fracture formation caused by the initiation and propagation of seismic cracks. Specifically, this study revealed the causes of various and complex forms of infrasonic precursors near the critical point and the causes of the time- and space-dependent characteristics of these precursors, such as a noticeable attenuation of the pulse number, a low frequency and a large amplitude, which verified the effectiveness of infrasonic anomalies as strong earthquake precursors.Wei WangXiaorong XueWeisheng ChenXiaoyan XuePublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 10, p e0257345 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Wei Wang Xiaorong Xue Weisheng Chen Xiaoyan Xue Study on the characteristic mechanisms of infrasonic precursors during the damage process of impending earthquake sources.
description	Infrasonic signals measured before an earthquake carry information about the size and development speed of the source fracture, the stress at the fracture site and the elastic properties of the geologic medium. The infrasonic signal has a stable time scale, and compared with other precursors, infrasound has a unique sensitivity to earthquake disasters. However, to date, there has been no relevant theoretical research on the mechanism of infrasonic anomalies, and information on the development of fracture sources cannot be obtained from these characteristics, which makes the application of this anomaly in earthquake prediction challenging. In this study, we obtained the characteristics of short-term and impending infrasonic anomalies based on the infrasound data of more than 100 strong earthquakes. With a range of elastic medium models with a large number of fractures, we completed the theoretical simulation of the formation process of infrasonic precursors during the formation of the main fractures, analyzed the physical evolution of acoustic signals when cracks are generated, and quantitatively described the stages of large fracture formation caused by the initiation and propagation of seismic cracks. Specifically, this study revealed the causes of various and complex forms of infrasonic precursors near the critical point and the causes of the time- and space-dependent characteristics of these precursors, such as a noticeable attenuation of the pulse number, a low frequency and a large amplitude, which verified the effectiveness of infrasonic anomalies as strong earthquake precursors.
format	article
author	Wei Wang Xiaorong Xue Weisheng Chen Xiaoyan Xue
author_facet	Wei Wang Xiaorong Xue Weisheng Chen Xiaoyan Xue
author_sort	Wei Wang
title	Study on the characteristic mechanisms of infrasonic precursors during the damage process of impending earthquake sources.
title_short	Study on the characteristic mechanisms of infrasonic precursors during the damage process of impending earthquake sources.
title_full	Study on the characteristic mechanisms of infrasonic precursors during the damage process of impending earthquake sources.
title_fullStr	Study on the characteristic mechanisms of infrasonic precursors during the damage process of impending earthquake sources.
title_full_unstemmed	Study on the characteristic mechanisms of infrasonic precursors during the damage process of impending earthquake sources.
title_sort	study on the characteristic mechanisms of infrasonic precursors during the damage process of impending earthquake sources.
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/9750cd75aee446b4ab8842728aadd1a7
work_keys_str_mv	AT weiwang studyonthecharacteristicmechanismsofinfrasonicprecursorsduringthedamageprocessofimpendingearthquakesources AT xiaorongxue studyonthecharacteristicmechanismsofinfrasonicprecursorsduringthedamageprocessofimpendingearthquakesources AT weishengchen studyonthecharacteristicmechanismsofinfrasonicprecursorsduringthedamageprocessofimpendingearthquakesources AT xiaoyanxue studyonthecharacteristicmechanismsofinfrasonicprecursorsduringthedamageprocessofimpendingearthquakesources
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Study on the characteristic mechanisms of infrasonic precursors during the damage process of impending earthquake sources.

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