Finite-difference time-domain modeling of transient infrasonic wavefields excited by volcanic explosions

Numerical modeling of waveform diffractions along the rim of a volcano vent shows high correlation to observed explosion signals at Karymsky Volcano, Kamchatka, Russia. The finite difference modeling assumed a gaussian source time function and an axisymmetric geometry. A clear demonstration of the s...

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Bibliographic Details
Main Authors: Kim, K., Lees, J.M.
Other Authors: College of Arts and Sciences, Department of Geological Sciences
Format: Article in Journal/Newspaper
Language:English
Published: Blackwell Publishing Ltd 2011
Subjects:
Kamchatka
finite difference method
waveform analysis
wave field
geometry
Russian Federation
observational method
Karymsky Volcano
volcanic eruption
numerical model
Online Access:https://doi.org/10.17615/p746-bh84
https://cdr.lib.unc.edu/downloads/ng451t456?file=thumbnail
https://cdr.lib.unc.edu/downloads/ng451t456
Description
Summary:Numerical modeling of waveform diffractions along the rim of a volcano vent shows high correlation to observed explosion signals at Karymsky Volcano, Kamchatka, Russia. The finite difference modeling assumed a gaussian source time function and an axisymmetric geometry. A clear demonstration of the significant distortion of infrasonic wavefronts was caused by diffraction at the vent rim edge. Data collected at Karymsky in 1997 and 1998 were compared to synthetic waveforms and variations of vent geometry were determined via grid search. Karymsky exhibited a wide range of variation in infrasonic waveforms, well explained by the diffraction, and modeled as changing vent geometry. Rim diffraction of volcanic infrasound is shown to be significant and must be accounted for when interpreting source physics from acoustic observations.

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