Comparison of Seismic Detectors Applied to an Explosion Aftershock Sequence

Date: 4/24/2019

Time: 06:00 PM

Room: Grand Ballroom

The chemical explosion referred to as DAG-2 was successfully detonated at the Nevada National Security Site as part of the ongoing Source Physics experiment (SPE), on 19 December 2019. This shot, like its predecessor DAG-1, was detonated within a thick sequence of sediments as part of our effort to understand the effects of a soft-rock environment on observations for the explosion source. Earlier SPE shots were detonated at a site within the Climax Stock, a granitic medium chosen to assess the seismic and acoustic observations of explosion sources at a hard rock location. Unlike the first DAG shot or the previous SPE shots, DAG-2 has produced a rich sequence of aftershocks whose description and analysis may reveal important details of the site material response to a large, underground explosion. The explosion and several days of subsequent data were recorded on a variety of sensors with varying gains and a range of positions with respect to the shot. We report on a comparison of seismic event detection methods and their relative performance in obtaining reliable detections and cross-validation of detector results.

Presenting Author: Joshua D. Carmichael

Authors