Accession Number : AD0701750

Title :   LONG-PERIOD SEISMIC METHODS FOR IDENTIFYING SMALL, UNDERGROUND NUCLEAR EXPLOSIONS.

Descriptive Note : Final rept.,

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF GEOLOGY AND GEOPHYSICS

Personal Author(s) : Alexander,Shelton S.

Report Date : 31 MAY 1969

Pagination or Media Count : 26

Abstract : The purpose of this grant was to investigate those aspects of long-period seismic wave excitation which show promise of being diagnostic in distinguishing small explosions from earthquakes. Central to this study is the development of analysis methods to test experimentally diagnostic criteria suggested by theory and to assess the practical usefulness of these criteria. This report describes in condensed form methods for: (a) detecting and separating Love and Rayleigh waves for small events; (b) estimating spectra of weak surface wave signals; (c) combining Love and Rayleigh waves for improved surface wave magnitude estimates; (d) remotely determining crustal structure in seismic source regions; (e) determining site structure from ellipticity dispersion; (f) determining relative locations of events using P-waves and surface waves; (g) numerical computations implementing these techniques. (Author)

Descriptors :   (*SEISMOLOGICAL STATIONS, NOISE), (*UNDERGROUND EXPLOSIONS, DETECTION), EARTHQUAKES, POWER SPECTRA, RAYLEIGH WAVES, NUCLEAR EXPLOSIONS, IDENTIFICATION, SIGNAL-TO-NOISE RATIO, EXCITATION, ATTENUATION, EPICENTERS, PHASED ARRAYS, SAMPLING, DATA PROCESSING

Subject Categories : Seismology
      Seismic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE