Fast Infrasonic Arrivals at the Long Distances from Explosions

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Presentation transcript:

Fast Infrasonic Arrivals at the Long Distances from Explosions Sergey Kulichkov1, Laslo Evers2, Elisabeth Blanc3, Lars Ceranna4, Alexis Le Pichon5 Anatoly Barishnokov 6 INFRASOUND TECHNOLOGY WORKSHOP, BERMUDA, November 3-7, 2008

OVERVIEW ♦The mechanism of the formation of anomalously fast infrasonic arrivals at long distances from surface explosions is discussed. ♦ These arrivals have propagation speeds c ( c=r/T) higher than 320 m/s. ♦ These arrivals are observed in the absence of acoustic waveguides in the troposphere. ♦ It is assumed that such signals correspond to infrasonic propagation along a slightly inclined ray path having a significantly extended horizontal portion at a height of the maximum effective sound speed within the upper stratosphere (z is about 50 km). ♦ Ray theory and the Time Domain Parabolic Equation code (TDPE) are used as theoretical models. ♦ The solutions obtained are compared with experimental data on acoustic signals recorded at a long distances from 500 t tnt surface explosions and from blast site at oil depot in the UK (oil depot in Buncefield, UK) December 11, 2005. ♦ A satisfactory agreement between the theoretical and experimental data is noted.

FAST INFRASONIC ARRIVALS

Infrasonic arrivals at a distance of 635 km from explosions (500 t tnt) Experiment and Theory

Sound velocity and Ray paths (oil depot in Buncefield, UK, December 11, 2005)

Infrasonic signal from a vapor cloud explosion occurred at an oil depot near Buncefield, December 11, 2005 (r = 435 km)

ICADE (641 km)

FLERS (334 km)

CONCLUSIONS ♦ Fast infrasonic arrivals are observed at the different distances from explosions. ♦ TDPE code and Ray theory allow one to satisfactorily interpret the basic characteristic properties of infrasonic signals recorded at large distances from explosions. ♦ Fast infrasonic arrivals may be used to determine the site of explosion by using of only one observation site.

THANK YOU !