Accession Number : ADP204454

Title :   The Effect of Near-Receiver Scattering on Seismograms,

Corporate Author : CALIFORNIA UNIV BERKELEY LAWRENCE BERKELEY LAB

Personal Author(s) : Johnson, Lane R.

PDF Url : ADP204454

Report Date : 14 AUG 1995

Pagination or Media Count : 12

Abstract : In the study of physical processes involved in the generation and propagation of seismic waves at near and regional distances, it is important to distinguish those features on the seismogram which contain primary information concerning the source and those features which are due to noise. In this study the data recorded from the Non-Proliferation Experiment (NPE) are used to study the possibility that signal generated noise caused by scattering of elastic waves near the receiver may contribute significantly to the recorded waveforms of the direct P wave. Two different examples of anomalous waveforms, the vertical component of free-field recordings and the transverse component of surface recordings are investigated. The results of this study indicate that elastic wave scattering near seismic receivers can have a significant effect upon recorded waveforms, with effects as large as 50% of the primary wave easily achieved. The scattering effect is complex, with strong directional, frequency, and near-field effects. A better understanding of these scattering effects could lead to improved methods of siting seismic receivers for the purposes of reducing the signal-generated noise on seismograms.

Descriptors :   *SEISMIC DETECTION, *ARMS CONTROL, *NUCLEAR EXPLOSION DETECTION, *SEISMIC DISCRIMINATION, SCATTERING, SYMPOSIA, UNDERGROUND EXPLOSIONS, SEISMIC DATA, FREE FIELD, WAVE PROPAGATION, RECEIVERS, SEISMIC WAVES, RECORDING SYSTEMS, TREATIES, PRIMARY WAVES(SEISMIC WAVES), ELASTIC WAVES, SEISMOGRAPHS.

Subject Categories : Government and Political Science
      Seismology
      Seismic Detection and Detectors
      Nuclear Weapons

Distribution Statement : APPROVED FOR PUBLIC RELEASE