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- W2186575897 abstract "The porous structure and near-surface layering of ground influences propagation of acoustic and seismic pulses originating from above-surface sound sources. Snow cover modifies the acoustical properties and frozen ground adds to the layering effect. A numerical model, Pulse Fast Field Program for Layered Air Ground Systems (PFFLAGS), developed originally (as FFLAGS) for continuous sound sources, is outlined. It is used to fit radial and vertical seismic signals recorded by a geophone and resulting from above-ground explosions over three types of ground including ‘hard’ and ‘soft’ soil and snow cover. An effective linear source pulse has been determined assuming that non-linear effects are small at the ranges of interest. The resulting deduction of parameters describing the near-surface ground structure is based first on fitting pore-related parameters to the above-ground acoustic waveforms received by microphones and then fitting the other parameters including elastic constants and layer dimensions to the vertical and radial components of soil velocity measured by collocated geophones. A similar procedure involving conjunctive use of buried probe microphone and geophone data has been used for fitting acoustic-to-seismic coupling spectra for quarry sand and a dry friable soil. Prospects for using this approach more generally for deducing soil strength, air permeability, moisture content and structure from non-invasive acoustic and seismic measurements are discussed." @default.
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- W2186575897 date "2010-01-01" @default.
- W2186575897 modified "2023-09-27" @default.
- W2186575897 title "Prediction of surface particle velocity from above- ground sound sources" @default.
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