The stratospheric arrival pair in infrasound propagation.
The ideal case of a deep and well-formed stratospheric duct for long range infrasound propagation in the absence of tropospheric ducting is considered. A canonical form, that of a pair of arrivals, for ground returns of impulsive signals in a stratospheric duct is determined. The canonical form is derived from the geometrical acoustics approximation, and is validated and extended through full wave modeling. The full caustic structure of the field of ray paths is found and used to determine phase relations between the contributions to the wavetrain from different propagation paths. Finally, comparison with data collected from the 2005 fuel gas depot explosion in Buncefield, England is made. The correspondence between the theoretical results and the observations is shown to be quite good.
National Center for Physical Acoustics, University of Mississippi, University, Mississippi 38677.
Roger
R
Waxler
Seismology Division, Royal Netherlands Meteorological Institute (KNMI), P.O. Box 201, 3730 AE, De Bilt, The Netherlands.
Läslo G
LG
Evers
CEA, DAM, DIF, F-91297 Arpajon, France.
Jelle
J
Assink
Earth and Environmental Science Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545.
Phillip
P
Blom