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Infrasonic ambient noise interferometry from correlations of microbaroms
Author(s) -
Haney M. M.
Publication year - 2009
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2009gl040179
Subject(s) - microseism , infrasound , ambient noise level , geology , geophysics , impulse response , interferometry , noise (video) , impulse (physics) , acoustics , atmosphere (unit) , seismology , environmental science , meteorology , physics , optics , sound (geography) , computer science , mathematical analysis , mathematics , quantum mechanics , artificial intelligence , image (mathematics)
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.