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Volume Flow Rate Estimation for Small Explosions at Mt. Etna, Italy, From Acoustic Waveform Inversion

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1029/2019GL084598· OSTI ID:1601951
 [1];  [2];  [3];  [2];  [4];  [5];  [1]
  1. Univ. of Liverpool (United Kingdom)
  2. Univ. of Alaska, Fairbanks, AK (United States). Alaska Volcano Observatory, Geophysical Inst.
  3. Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Geological Sciences
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  5. Istituto Nazionale di Geofisica e Vulcanologia, Pisa (Italy); Univ. of Granada (Spain)
Rapid assessment of the volume and the rate at which gas and pyroclasts are injected into the atmosphere during volcanic explosions is key to effective eruption hazard mitigation. Here, we use data from a dense infrasound network deployed in 2017 on Mt. Etna, Italy, to estimate eruptive volume flow rates (VFRs) during small gas-and-ash explosions. We use a finite-difference time-domain approximation to compute the acoustic Green's functions and perform a full waveform inversion for a multipole source, combining monopole and horizontal dipole terms. The inversion produces realistic estimates of VFR, on the order of 4 × 104 m3/s and well-defined patterns of source directivity. This is the first application of acoustic waveform inversion at Mt. Etna. Our results demonstrate that acoustic waveform inversion is a mature and robust tool for assessment of source parameters and holds potential as a tool to provide rapid estimates of VFR in near real time.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1601951
Report Number(s):
LLNL-JRNL--805799; 1011071
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 20 Vol. 46; ISSN 0094-8276
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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