Accession Number : ADP204490

Title :   Source Finiteness, Signal Decorrelation, Spectral Scalloping and Identification of Multiple Delayed Explosions,

Corporate Author : ENSCO INC SPRINGFIELD VA

Personal Author(s) : Der, Zoltan A. ; Baumgardt, Douglas R.

PDF Url : ADP204490

Report Date : 14 AUG 1995

Pagination or Media Count : 10

Abstract : Our results show that a generalized model that includes propagation delays and signal decorrelation can reproduce numerous observed features in the spectral modulation patterns of regional phases from quarry blasts. Analyses of spectra associated with various regional arrivals of the same event revealed differences in modulation strength and apparent shifts in modulation patterns. These may be associated with source finiteness, propagation delays and signal decorrelation. Potentially these features can be used to derive information with regards to the spatial extent and layout of shot arrays. Modulation patterns or the locations of first minima in the spectra are generally not determined solely by the time duration of the shot sequences as often claimed, but are complex functions of numerous factors. Lack of spectral modulation does not necessarily indicate a single explosion or the absence of ripple firing either. Since this project has just begun, the results presented here are relevant only a to a subset of the tasks to be performed under this contract

Descriptors :   *DATA PROCESSING, *SEISMIC DETECTION, *ARMS CONTROL, *NUCLEAR EXPLOSION DETECTION, *SEISMIC DISCRIMINATION, SIGNAL PROCESSING, COMPUTERIZED SIMULATION, SYMPOSIA, MONITORING, UNDERGROUND EXPLOSIONS, NUCLEAR EXPLOSION TESTING, MINING ENGINEERING, SEISMIC WAVES, TREATIES, EARTHQUAKES, SPECTRUM ANALYSIS, SEISMIC ARRAYS.

Subject Categories : Government and Political Science
      Seismology
      Computer Programming and Software
      Seismic Detection and Detectors
      Nuclear Weapons
      Mining Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE