Reduction of randomness in seismic noise as a short-term precursor to a volcanic eruption

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題名:	Reduction of randomness in seismic noise as a short-term precursor to a volcanic eruption
作者:	柯士達;Glynn, C. C.;Konstantinou, K. I.
貢獻者:	地球科學學院地球科學學系
關鍵詞:	704/2151/508;704/2151/598;704/4111;Calderas;Earthquakes;Humanities and Social Sciences;multidisciplinary;Noise reduction;Science;Seismic activity;Volcanic eruptions;Volcanoes
日期:	2016-12-23
上傳時間:	2026-04-23 11:42:08 (UTC+8)
出版者:	Nature Publishing Group;London: Springer Science and Business Media LLC
摘要:	摘要： AbstractAmbient seismic noise is characterized by randomness incurred by the random position and strength of the noise sources as well as the heterogeneous properties of the medium through which it propagates. Here we use ambient noise data recorded prior to the 1996 Gjálp eruption in Iceland in order to show that a reduction of noise randomness can be a clear short-term precursor to volcanic activity. The eruption was preceded on 29 September 1996 by a Mw ~5.6 earthquake that occurred in the caldera rim of the Bárdarbunga volcano. A significant reduction of randomness started occurring 8 days before the earthquake and 10 days before the onset of the eruption. This reduction was observed even at stations more than 100 km away from the eruption site. Randomness increased to its previous levels 160 minutes after the Bárdarbunga earthquake, during which time aftershocks migrated from the Bárdarbunga caldera to a site near the Gjálp eruption fissure. We attribute this precursory reduction of randomness to the lack of higher frequencies (>1 Hz) in the noise wavefield caused by high absorption losses as hot magma ascended in the upper crust. 其他題名： Sci Rep 出版者： London: Springer Science and Business Media LLC 出版日期： 2016-11-24 出處： Scientific Reports, 2016-11, Vol.6 (1), p.1--37733, Article 37733 資源來源： ProQuest Open Access Content Collection 版權： The Author(s) 2016 版權： Copyright Nature Publishing Group Nov 2016 版權： Copyright © 2016, The Author(s) 2016 The Author(s) 識別號： ISSN: 2045-2322 識別號： EISSN: 2045-2322 識別號： DOI: 10.1038/srep37733 識別號： PMID: 27883050
顯示於類別:	[地球科學學系] 期刊論文

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