Time Domain Waveform Inversion of Short-Period P-Waves for Nuclear Explosion Source Time Functions

Abstract

This research investigates the estimation of the source time parameters of underground nuclear explosions from the waveforms of short-period teleseismic P-waves. In the simplest consideration, and when the source yield is unconstrained, there are only three source parameters, two that describe the source time function and one for the delay time of the (p)P phase. There are, of course, indications that the (p)P arrival may not have the same amplitude or shape as the direct P arrival, presumably due to anelastic or nonlinear effects between the shot point and the surface. Thus, we will also consider the effect on the waveforms of a decreased (p)P amplitude. Another parameter which has a significant influence upon the observed waveforms is t (t = travel time/Q(av). Accordingly, the variations in the source parameter estimates due to a varying t will also be addressed.

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Document Details

Document Type
Technical Report
Publication Date
Jan 09, 1981
Accession Number
ADA101123

Entities

People

  • Larry J. Ruff

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Abstracts
  • Amplitude
  • Delta Functions
  • Explosions
  • Far Field
  • Frequency
  • Geophysics
  • Inversion
  • Iterations
  • Monitoring
  • Near Field
  • Nuclear Explosions
  • Time Domain
  • Travel Time
  • Underground Explosions
  • Waveforms
  • Waves

Readers

  • Computational Modeling and Simulation
  • Seismology