DOI: 10.1002/2014GL061068
论文题名: Experimental modeling of infrasound emission from slug bursting on volcanoes
作者: Sánchez C. ; Álvarez B. ; Melo F. ; Vidal V.
刊名: Geophysical Research Letters
ISSN: 0094-9723
EISSN: 1944-9454
出版年: 2014
卷: 41, 期: 19 起始页码: 6705
结束页码: 6711
语种: 英语
英文关键词: acoustics
; bubble bursting
; laboratory experiments
; slugs
; volcanology
Scopus关键词: Acoustic waves
; Experiments
; Volcanoes
; Bubble bursting
; Cylindrical cavities
; Experimental modeling
; Geometrical correction
; Laboratory experiments
; Non-linear acoustics
; slugs
; volcanology
; Acoustics
; acoustic emission
; harmonic analysis
; infrasonics
; overpressure
; volcanic eruption
; waveform analysis
; Gastropoda
英文摘要: The acoustic signal produced by gas slugs bursting at volcano vents is investigated by means of laboratory experiments. In order to explore the transition between linear and nonlinear acoustics, we model the bubble by an overpressurized cylindrical cavity closed by a membrane. We find that the acoustic waveform inside and outside the cavity, produced by the membrane bursting, is well described by the linear acoustics equations and a monopole source model up to an initial overpressure inside the cavity of about 24 kPa. For higher overpressure, the amplitude inside the conduit is smaller than the linear prediction, whereas the amplitude measured outside is larger. The frequency content remains harmonic, even at high initial overpressure. Changing the bursting depth in the conduit does not change the scaling of the amplitudes but affects the waveform and energy partitioning. We show that the energy of the first signal period is about 30% of the total acoustic energy and can be used as a good estimate, with a geometrical correction to account for the bursting depth. Key Points No simple relationship between the acoustic amplitude and bubble overpressureBelow ΔP = 24 kPa, the monopole source theory holds trueThe energy computed over the first period is a good proxy for the total energy ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84911091714&doi=10.1002%2f2014GL061068&partnerID=40&md5=24ac241641e8db39cf21949da2c3ff60
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6987
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Laboratorio de Física No Lineal, Departamento de Física, Universidad de Santiago de Chile, Santiago, Chile
Recommended Citation:
Sánchez C.,Álvarez B.,Melo F.,et al. Experimental modeling of infrasound emission from slug bursting on volcanoes[J]. Geophysical Research Letters,2014-01-01,41(19).