DOI: 10.1002/grl.50592
论文题名: Infrasound reveals transition to oscillatory discharge regime during lava fountaining: Implication for early warning
作者: Ulivieri G. ; Ripepe M. ; Marchetti E.
刊名: Geophysical Research Letters
ISSN: 0094-8905
EISSN: 1944-8636
出版年: 2013
卷: 40, 期: 12 起始页码: 3008
结束页码: 3013
语种: 英语
英文关键词: early warning
; gas flux transition
; infrasound monitoring
; lava fountain
; slug/churn flow
Scopus关键词: Early warning
; Gas flux
; Infrasound monitoring
; Lava fountains
; slug/churn flow
; Earth sciences
; Geophysics
; Fountains
; acoustic survey
; amplitude
; early warning system
; lava flow
; real time
; waveform analysis
英文摘要: We present the analysis of ~4 million infrasonic signals which include 39 episodes of lava fountains recorded at 5.5 km from the active vents. We show that each eruptive episode is characterized by a distinctive trend in the amplitude, waveform, and frequency content of the acoustic signals, reflecting different explosive levels. Lava fountain starts with an ~93 min long violent phase of acoustic transients at ~1.25 Hz repeating every 2-5 s. Infrasound suddenly evolves into a persistent low-frequency quasi-monochromatic pressure oscillation at ~0.4 Hz. We interpret this shift as induced by the transition from the slug (discrete Strombolian) to churn flow (sustained lava fountain) regime that is reflecting an increase in the gas discharge rate. We calculate that infrasonic transition can occur at a gas superficial velocity of ≤76 m/s and it can be used to define infrasonic-based thresholds for an efficient early warning system. Key Points Lava fountain is characterized by monochromatic infrasonic oscillations Infrasonic reveals slug/Strombolian and churn/fountaining regimes Infrasound can be used to track gas discharge transition in real time ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84880560529&doi=10.1002%2fgrl.50592&partnerID=40&md5=fc4214ca6bfa18165fdc916dd29f8f45
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6169
Appears in Collections: 气候减缓与适应
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作者单位: Dipartimento di Scienze della Terra, Università di Firenze, Via la Pira 4, IT-50121 Florence, Italy
Recommended Citation:
Ulivieri G.,Ripepe M.,Marchetti E.. Infrasound reveals transition to oscillatory discharge regime during lava fountaining: Implication for early warning[J]. Geophysical Research Letters,2013-01-01,40(12).