气候变化领域集成服务门户(CCPortal): Drumbeat LP “Aftershocks” to a Failed Explosive Eruption at Tungurahua Volcano; Ecuador

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DOI	10.1029/2020GL088301
	Drumbeat LP “Aftershocks” to a Failed Explosive Eruption at Tungurahua Volcano; Ecuador
	Butcher S.; Bell A.F.; Hernandez S.; Calder E.; Ruiz M.; Mothes P.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:16
英文摘要	Highly periodic, repetitive long-period (LP) earthquakes, known as “drumbeats,” have been observed at a range of volcanoes, typically during the ascent of degassed magma. Accelerating rates of drumbeats have been reported before explosions and potentially offer forecasts of future activity. However, the broader phenomenology of drumbeats is poorly understood. Here we describe an episode of over 900 LP earthquakes recorded in November 2015 at Tungurahua Volcano, Ecuador, that we believe are associated with a failed explosion. Rates of LP drumbeats accelerated for 10 hr, consistent with an inverse Omori's law. Before any explosion occurred, seismicity decreased following Omori's law, over a further 6 days. Despite earthquake rates decelerating, amplitudes, spectral peaks, Q values, and periodicity remain constant, suggesting there is little change in the source process with time. We argue that the decelerating seismicity is a result of progressive reduction of gas flux, unable to provide sufficient overpressure for explosion. ©2020. The Authors.
英文关键词	Explosions; Volcanoes; Earthquake rates; Explosive eruption; Omori's law; Overpressure; Q-values; Source process; Spectral peak; Tungurahua Volcano; Earthquakes; aftershock; amplitude; earthquake event; explosive volcanism; gas flow; magma; overpressure; periodicity; seismic data; volcanic eruption; Ecuador; Tungurahua; Tungurahua Volcano
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169869
作者单位	School of GeoSciences, University of Edinburgh, Edinburgh, United Kingdom; Instituto Geofísico, Escuela Politécnica Nacional, Quito, Ecuador
推荐引用方式 GB/T 7714	Butcher S.,Bell A.F.,Hernandez S.,等. Drumbeat LP “Aftershocks” to a Failed Explosive Eruption at Tungurahua Volcano; Ecuador[J],2020,47(16).
APA	Butcher S.,Bell A.F.,Hernandez S.,Calder E.,Ruiz M.,&Mothes P..(2020).Drumbeat LP “Aftershocks” to a Failed Explosive Eruption at Tungurahua Volcano; Ecuador.Geophysical Research Letters,47(16).
MLA	Butcher S.,et al."Drumbeat LP “Aftershocks” to a Failed Explosive Eruption at Tungurahua Volcano; Ecuador".Geophysical Research Letters 47.16(2020).