DOI: 10.1002/2013GL057900
论文题名: Blast waves from violent explosive activity at Yasur Volcano, Vanuatu
作者: Marchetti E. ; Ripepe M. ; Delle Donne D. ; Genco R. ; Finizola A. ; Garaebiti E.
刊名: Geophysical Research Letters
ISSN: 0094-8359
EISSN: 1944-8090
出版年: 2013
卷: 40, 期: 22 起始页码: 5838
结束页码: 5843
语种: 英语
英文关键词: blast waves
; infrasound
; strombolian
Scopus关键词: Blast waves
; Explosive activity
; Infrasound
; Pressure amplitudes
; strombolian
; Strombolian activity
; Vapor condensation
; Waveform characteristics
; Vapors
; Volcanoes
; Explosives
; amplitude
; cold front
; condensation
; explosive volcanism
; infrared imagery
; infrasonics
; seismic wave
; wave modeling
; waveform analysis
; Tanna
; Vanuatu
; Yasur Volcano
英文摘要: Infrasonic and seismic waveforms were collected during violent strombolian activity at Yasur Volcano (Vanuatu). Averaging ∼3000 seismic events showed stable waveforms, evidencing a low-frequency (0.1-0.3 Hz) signal preceding ∼5-6 s the explosion. Infrasonic waveforms were mostly asymmetric with a sharp compressive (5-106 Pa) onset, followed by a small long-lasting rarefaction phase. Regardless of the pressure amplitude, the ratio between the positive and negative phases was constant. These waveform characteristics closely resembled blast waves. Infrared imagery showed an apparent cold spherical front ∼20 m thick, which moved between 342 and 405 m/s before the explosive hot gas/fragments cloud. We interpret this cold front as that produced by the vapor condensation induced by the passage of the shock front. We suggest that violent strombolian activity at Yasur was driven by supersonic dynamics with gas expanding at 1.1 Mach number inside the conduit. ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84887918361&doi=10.1002%2f2013GL057900&partnerID=40&md5=ad09f31f420d1e6b37cac5f6380757a7
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5623
Appears in Collections: 气候减缓与适应
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作者单位: Dipartimento di Scienze della Terra, Università Degli Studi di Firenze, Via G. La Pira, 4, IT-50121 Firenze, Italy
Recommended Citation:
Marchetti E.,Ripepe M.,Delle Donne D.,et al. Blast waves from violent explosive activity at Yasur Volcano, Vanuatu[J]. Geophysical Research Letters,2013-01-01,40(22).