DOI: 10.1002/2014GL061597
论文题名: Acoustic wavefield and Mach wave radiation of flashing arcs in strombolian explosion measured by image luminance
作者: Genco R. ; Ripepe M. ; Marchetti E. ; Bonadonna C. ; Biass S.
刊名: Geophysical Research Letters
ISSN: 0094-9677
EISSN: 1944-9408
出版年: 2014
卷: 41, 期: 20 起始页码: 7135
结束页码: 7142
语种: 英语
英文关键词: explosive dynamics
; image processing
; shock waves
; volcano acoustic
Scopus关键词: Dynamics
; Explosives
; Image processing
; Shock waves
; Underwater acoustics
; Volcanoes
; Wavefronts
; Explosive activity
; Explosive dynamics
; Front propagation
; High-speed image processing
; Large scale turbulence
; Luminance variation
; Mach wave radiation
; Virtual acoustics
; Luminance
; acoustic data
; fragmentation
; image processing
; luminescence
; plume
; radiation balance
; turbulence
; velocity
; wave propagation
英文摘要: Explosive activity often generates visible flashing arcs in the volcanic plume considered as the evidence of the shock-front propagation induced by supersonic dynamics. High-speed image processing is used to visualize the pressure wavefield associated with flashing arcs observed in strombolian explosions. Image luminance is converted in virtual acoustic signal compatible with the signal recorded by pressure transducer. Luminance variations are moving with a spherical front at a 344.7-m/s velocity. Flashing arcs travel at the sound speed already 14-m above the vent and are not necessarily the evidence of a supersonic explosive dynamics. However, seconds later, the velocity of small fragments increases, and the spherical acousto-luminance wavefront becomes planar recalling the Mach wave radiation generated by large scale turbulence in high-speed jet. This planar wavefront forms a Mach angle of 55° with the explosive jet axis, suggesting an explosive dynamics moving at Mo -=-1.22 Mach number. Key Points New image processing uses image luminance to measure the full acoustic wavefieldFlashing arcs are not necessarily the evidence of the shock-front propagationAcousto-luminance has plane wavefront recalling Mach wave radiation pattern ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84911443794&doi=10.1002%2f2014GL061597&partnerID=40&md5=da04e77968df14bc22f5b0bf08f5ad33
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6941
Appears in Collections: 气候减缓与适应
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作者单位: Dipartimento Scienze della Terra, Università di Firenze, Firenze, Italy
Recommended Citation:
Genco R.,Ripepe M.,Marchetti E.,et al. Acoustic wavefield and Mach wave radiation of flashing arcs in strombolian explosion measured by image luminance[J]. Geophysical Research Letters,2014-01-01,41(20).