Computer Science – Sound
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3416826f&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 16, CiteID L16826
Computer Science
Sound
10
Atmospheric Processes: Boundary Layer Processes, Volcanology: Atmospheric Effects (0370), Volcanology: Effusive Volcanism, Volcanology: Remote Sensing Of Volcanoes
Scientific paper
Volcanic tremor signals recorded by an infrasound array ~12.5 km from the active vent of Kīlauea Volcano show clear diurnal amplitude variations and originate from a well defined direction pointing to the active Pu`u `Ō`ō crater complex. Spectral amplitudes between 0.02-0.3 Hz, a proxy for wind speed, increase when the wind speeds increase during the daytime. Spectral amplitudes between 0.5-3 Hz, where infrasonic tremor is concentrated, increase when the wind speeds decrease at night. Power spectrum analysis shows that when ambient noise levels drop, infrasonic tremor amplitudes rise. Array processing confirms this relationship and reveals tremor detections and amplitudes decrease during the day. These changes in infrasonic tremor spectral amplitude and coherence are most likely due to diurnal variations in atmospheric boundary layers affecting infrasonic propagation within the diffraction zone. Recognition of these regional atmospheric patterns is necessary to permit robust infrasonic remote sensing of volcanic processes.
Fee David
Garces Milton
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