Study of Rg wave amplitude for SPE series using zero-mean stacking method
A modified version of the zero-mean stacking method is proposed to study Rgwave propagation effects recorded on the five lines of geophones during the first Phase of SPE. The relatively shallow depth of this series favors the generation of SPE series. We expect significant propagation effects due the strong azimuthal variation of the local geology and topography within the 2km extent of the geophone lines. We add bootstrapping to the method allowing to obtain a profile for each line and for five frequency-bands optimized in regards to consistency between explosions. Our results show that there is indeed consistency so we can conclude there were no significant changes in the subsurface of SPE in the 5 years of the first phase of SPE. We estimate attenuation coefficients for each lines and found consistent results between lines for the frequencies between 3 and 10Hz despite the difference of geology setting. This result is consistent with previous studies. We also deduce amplitude at Rg waves at ground-zero. We conclude that we need a better understanding of the uncertainty on these results to bring insight into the seismic sources of Rg waves.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- DOE Contract Number:
- 89233218CNA000001
- OSTI ID:
- 1487344
- Report Number(s):
- LA-UR-18-31634
- Country of Publication:
- United States
- Language:
- English
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