DOI: 10.1002/2014GL060143
论文题名: Wideband acoustic records of explosive volcanic eruptions at Stromboli: New insights on the explosive process and the acoustic source
作者: Goto A. ; Ripepe M. ; Lacanna G.
刊名: Geophysical Research Letters
ISSN: 0094-10545
EISSN: 1944-10276
出版年: 2014
卷: 41, 期: 11 起始页码: 3851
结束页码: 3857
语种: 英语
英文关键词: audible acoustic wave
; crackle
; infrasound
; Stromboli volcano
; supersonic jet
Scopus关键词: Acoustic waves
; Acoustics
; Explosives
; Volcanoes
; crackle
; High frequency HF
; High frequency signals
; Infrasound
; Positively skewed
; Stromboli volcano
; Supersonic jets
; Volcanic eruptions
; Supersonic aerodynamics
; correlation
; discharge
; infrasonics
; jet
; shock wave
; volcanic eruption
; waveform analysis
英文摘要: Wideband acoustic waves, both inaudible infrasound (<20 Hz) and audible component (>20 Hz), generated by strombolian eruptions were recorded at 5 kHz and correlated with video images. The high sample rate revealed that in addition to the known initial infrasound, the acoustic signal includes an energetic high-frequency (typically >100 Hz) coda. This audible signal starts before the positive infrasound onset goes negative. We suggest that the infrasonic onset is due to magma doming at the free surface, whereas the immediate high-frequency signal reflects the following explosive discharge flow. During strong gas-rich eruptions, positively skewed shockwave-like components with sharp compression and gradual depression appeared. We suggest that successive bursting of overpressurized small bubbles and the resultant volcanic jets sustain the highly gas-rich explosions and emit the audible sound. When the jet is supersonic, microexplosions of ambient air entrained in the hot jet emit the skewed waveforms. © 2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84902038315&doi=10.1002%2f2014GL060143&partnerID=40&md5=0d681fc8ffe90d49dfa6348897612600
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7809
Appears in Collections: 气候减缓与适应
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作者单位: Center for Northeast Asian Studies, Tohoku University, Sendai, Japan
Recommended Citation:
Goto A.,Ripepe M.,Lacanna G.. Wideband acoustic records of explosive volcanic eruptions at Stromboli: New insights on the explosive process and the acoustic source[J]. Geophysical Research Letters,2014-01-01,41(11).