Using the acoustic-pulse conservation law in estimating the energy of surface acoustic sources by remote sounding

摘要

The atmospheric effect on the characteristics of infrasonic signals from explosions has been studied. New methods have been proposed to remotely estimate the energy of explosions using the data of infrasonic wave registration. One method is based on the law of conservation of acoustic pulse I, which is equal to the product of the wave profile area S/2 of the studied infrasonic signal and the distance to the source E (I) [kt] = 1.38 x 10(-10) (I [kg/s])(1.482). The second method is based on the relationship between the explosion energy and the dominant period T of the recorded signal, ED cent [kt] =1.02 x (D cent [s](2)/sigma)(3/2), where sigma is a dimensionless distance used for determining the degree of manifestation of nonlinear effects in the propagation of sound along ray trajectories. When compared to the conventional E (W) (Whitaker's) relation, the advantage of the EI relation is that it can be used for pulsed sources located at an arbitrary height over the land surface and having an arbitrary form of the initial-pulse profile and for any type of infrasonic arrivals. A distinctive feature of the expression for E (D cent) is that the atmospheric effect on the characteristics of recorded infrasonic signals is explicitly taken into account. These methods have been tested using infrasonic data recorded at a distance of 322 km from the sources (30 explosions caused by a fire that occurred at the Pugachevo armory in Udmurtia on June 2, 2011). For the same explosion, empirical relations have been found between energy values obtained by different methods: E (I) = 1.107 x E (W) , E (D cent) = 2.201 x E (I) .