Studies of Microbaroms Using Multiple Infrasound Arrays
Abstract
Microbaroms, known to be produced by marine storms, are a prevalent infrasound signal due to the presence of strong storms over the oceans. Often the microbarom wave trains last for tens of hours allowing us to track the storm. When we perform a least-squares fit to plane-wave arrivals on the data we find the apparent source azimuth points to the center of the storm low-pressure center. Early research has shown that microbarom signals are associated with wave height in storms but the theoretical description for the coupling between water waves and acoustic waves in the atmosphere is not complete. Studies of microbaroms from multiple locations are better able to identify the source of microbaroms in the storm and to give an indication of the propagation paths from the storm center to the receivers. We have also begun to study the spatial coherence of microbaroms using the Hilbert Transform technique. We find that the mean packet length is of the order of 2 to 5 wavelengths. With this information we plan to break the wave trains into individual packets in order to explore the extent to which the source is localized.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 2001
- Accession Number
- ADA527336
Entities
People
- Charles W. Wilson
- Daniel Osborne
- Henry E. Bass
- John Berger
- John V. Olson
- Kenneth Gilbert
- Michael Hedlin
- Milton Garces
Organizations
- University of Mississippi