Accession Number : ADA292601

Title :   Two-Dimensional Signal Processing for Regional Seismic Event Identification.

Descriptive Note : Final rept. 3 Jun 93-31 Aug 94,

Corporate Author : RADIX SYSTEMS INC ROCKVILLE MD

Personal Author(s) : Pulli, Jay J. ; Dysart, Paul S.

PDF Url : ADA292601

Report Date : SEP 1994

Pagination or Media Count : 51

Abstract : The objective of this research was to develop a methodology for regional seismic event identification which utilizes 2-dimensional signal processing and treats the seismogram as an image. The motivation for this research comes from the observation that the spectral features which distinguish quarry explosions from earthquakes can be seen throughout the entire seismogram. These features, which include spectral banding, are apparent in the time-frequency (TF) representation of the seismogram. We parameterized the TF representation by computing the wavenumber spectrum of the image and fitting this to a stochastic surface model developed to characterize bathymetric surfaces. Five model parameters control image features such as lineations, spatial orientation, characteristics lengths, and roughness of the surface. (MM)

Descriptors :   *EXPLOSIONS, *SEISMIC DETECTION, *SEISMIC WAVES, *EARTHQUAKES, DATA BASES, SIGNAL PROCESSING, IMAGE PROCESSING, NEURAL NETS, TWO DIMENSIONAL, EIGENVALUES, BATHYMETRY, SEISMIC ARRAYS, SEISMOGRAPHS, MINES(EXCAVATIONS).

Subject Categories : Seismology
      Seismic Detection and Detectors
      Explosions
      Cybernetics

Distribution Statement : APPROVED FOR PUBLIC RELEASE