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Infrasound measurements during hurricane Katrina

Infrasound is used to detect both natural and man‐made events. Microbarometric measurement stations have been placed worldwide in order to detect infrasonic signals in the atmosphere. Such signals range in frequency from less than 0.01 to 10 Hz. Infrasound is produced by many natural phenomena including violent storms, gravity waves, the Aurora Borealis, and even some animals. Because infrasound signals have such low frequencies, they can travel great distances in the atmosphere, while maintaining good temporal coherence. This makes the atmosphere an excellent medium for infrasound signal propagation and corresponding detection of large storms, such as hurricanes and tornados, which generate strong infrasonic signals. This paper will discuss hurricane Katrina’s infrasound spectral results obtained from data measured by piezo‐ceramic infrasound sensors in Oxford, MS, about 400 miles to the north of New Orleans. Spectral and temporal coherence results will be presented and discussed. [Work supported by ARDEC.]