Results of the SDCS (Special Data Collection System) Attenuation Experiment

Abstract

Investigation of teleseismic arrivals at test sites in the western United States (WUS), a site on the Canadian shield and two sites in the northeastern United States revealed marked differences in mantle attenuation among these sites. All sites in the WUS show high attenuation in the underlying mantle, the sites in the northeastern U.S. appear to be intermediate between the WUS and the shield sites. This pattern fits well into the results of broader regional studies of amplitude anomalies, and spectral variations in both P and S waves. The high frequency content of teleseismic arrivals cannot be reconciled with the results of long period attenuation studies unless a frequency dependence of Q is assumed in the Earth. Preliminary curves for t vs. frequency are presented for shield and shield-to-tectonic type paths. These results demonstrate that yield estimates of explosions in different tectonic environments have to be corrected for mantle attenuation.

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Document Details

Document Type
Technical Report
Publication Date
Oct 30, 1981
Accession Number
ADA111830

Entities

People

  • A. O'donnell
  • T. W. Mcelfresh
  • Z. A. Der

Tags

Communities of Interest

  • Energy and Power Technologies
  • Sensors

DTIC Thesaurus Topics

  • Accuracy
  • Data Analysis
  • Data Sets
  • Databases
  • Energy
  • Explosions
  • Explosives
  • Frequency Shift
  • Geography
  • Measurement
  • North America
  • Nuclear Explosions
  • Plastic Explosives
  • Recording Systems
  • Surface Waves
  • United States
  • Waveforms

Fields of Study

  • Environmental science

Readers

  • Seismology