Infrasonic ambient noise interferometry from correlations of microbaroms

Geophysical Research Letters



We show that microbaroms, continuous infrasound fluctuations resulting from the interaction of the ocean with the atmosphere, have long-range correlation properties that make it possible to estimate the impulse response between two microphones from passive recordings. The processing is analogous to methods employed in the emerging field of ambient noise seismology, where the random noise source is the ocean coupling with the solid Earth (microseisms) instead of the atmosphere (microbaroms). We find that time-dependent temperature fields and temperature inversions determine the character of infrasonic impulse responses at Fourpeaked Volcano in Alaska. Applications include imaging and monitoring the gross structure of the Earth's atmospheric boundary layer. Copyright 2009 by the American Geophysical Union.
Publication type Article
Publication Subtype Journal Article
Title Infrasonic ambient noise interferometry from correlations of microbaroms
Series title Geophysical Research Letters
DOI 10.1029/2009GL040179
Volume 36
Issue 19
Year Published 2009
Language English
Contributing office(s) Volcano Hazards Program
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Geophysical Research Letters
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