High-Frequency Rg Modeling at the Spe Site Using Accelerated Weight Drop Sources

Date: 4/24/2019

Time: 06:00 PM

Room: Grand Ballroom

We present the current status of a shallow seismic velocity modeling effort undertaken as part of the Source Physics Experiment at the Nevada National Security Site. The SPE experiment included five lines of geophones extending radially from a central drill hole in which chemical explosion sources were detonated. Because no reverse profiles were obtained and the geophones were positioned with 100 m spacing, refraction analysis of the medium is ambiguous and surface wave analysis provides limited resolution of the shallowest layers because of spatial aliasing. An Accelerated Weight Drop (AWD) source was deployed along four of the five geophone lines, providing Rg energy throughout much of their lengths with source spacings of roughly 20 m. Leveraging reciprocity, these data afford us the opportunity to refine our earlier, coarse model and examine Rg propagation at a finer scale, with resolution of higher frequencies and thus shallower structure.

Presenting Author: Charlotte A. Rowe

Authors