"Wave propagation." . . "Microprocessors." . . "Test and evaluation." . . "Numerical Mathematics." . . "Mathematical prediction." . . "Detectors." . . "Computer programming." . . "Beam forming." . . "Data processing." . . . . . . . . . . . . "We examined the feasibility of a post-detector as part of an automated seismic data processing system. The post-detector consisted of two parts. One is a three-component processor to determine the wave propagation, direction and distance of the signal. The other, a coherent beamforming process applied to a regional network of sensors to locate events within targeted seismically active areas of interest. Our results indicated that three-component processing is approximately equivalent to a medium-sized array in obtaining initial locations for automatic event association of detected signal. Significant detection gains were also observed, but not yet evaluated. Coherent beamforming of a regional network of sensors effectively detected and located small events in a targeted seismic region at teleseismic distance from the regional network. These preliminary results indicate that post-detection processing is sufficiently feasible to be tested on regional networks of three-component data, ideally situated at regional or teleseismic distance from targeted areas of interest. (Author)."@en . . . . . . . . . . . . . . . . "Automatic Seismic Signal Processing"@en . "Computer Programming and Software." . . "Computer Hardware." . . "Coherence." . . "Automatic." . . "Test Facilities, Equipment and Methods." . . "Signal processing." . . "Real time." . . "Range(distance)" . . "ENSCO INC SPRINGFIELD VA SIGNAL ANALYSIS SYSTEMS DIV." . . . . "Seismic waves." . . "Non-radio Communications." . .