Time-domain study of tectonic strain-release effects on seismic waves from underground nuclear explosions
Tectonic strain release affects both the amplitude and phase of seismic waves from underground nuclear explosions. Surface wave magnitudes are strongly affected by the component of tectonic strain release in the explosion. Amplitudes and radiation patterns of surface waves from explosions with even small tectonic components change magnitudes significantly and show a strong dependence on receiver locations. A thrust-slip source superimposed on an isotropic explosion can explain observed reversals in waveform at different azimuths and phase delays between normal and reversed Rayleigh waves. The mechanism of this reversal is due to the phase relationship between reasonable explosion and tectonic release sources. Spallation or an unusual source time function are not required. The observations of Shagan River events imply thrust-slip motion along faults in a northwest-southeast direction, which is consistent with regional tectonics.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6713662
- Report Number(s):
- UCRL-53321; ON: DE83002610
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
UNDERGROUND EXPLOSIONS
SEISMIC EFFECTS
AMPLITUDES
NUCLEAR EXPLOSIONS
SEISMIC DETECTION
SEISMIC SURFACE WAVES
STRAINS
TECTONICS
DETECTION
EXPLOSIONS
SEISMIC WAVES
450300* - Military Technology
Weaponry
& National Defense- Nuclear Explosion Detection