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The Source Physics Experiment and Distributed Acoustic Sensing

Description: 

The Source Physics Experiment (SPE) is a multi-decadal program to study explosion-source phenomenology using a combination of modeling and extensive field experiments. In SPE Phase II, Dry Alluvium Geology (DAG), fiber optic cables for Distributed Acoustic Sensing (DAS) were deployed and interrogated with a Silixa iDAS interrogator. The surface and subsurface in a monitoring well recordings with both DAS and co-located traditional geophones provide an unprecedented view of the seismic wavefields generated by the series of chemical explosions. Utilizing these wavefield observations, synthetic wavefield calculations, and machine learning methods, we explore how best to deploy and analyze DAS data for SPE Phase III, Rock Valley Direct Comparison (RV/DC). Key findings include (1) optimal results are derived from treating the dataset as an array, (2) polygonal arrays with odd numbers of sides reduce artifacts, and (3) channel-to-channel similarity can be leveraged for new methods of denoising and arrival picking. The first two of these findings will inform array designs of new integrated large scale multidisciplinary geophysical field experiments and campaigns, such as future phases of the SPE. The first and third findings will be more generally useful to any DAS data analysis, including cases where pre-existing fiber networks are utilized. SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525

SAND2025-00089A

Session: Advancements in Forensic Seismology and Explosion Monitoring - III

Type: Oral

Date: 4/17/2025

Presentation Time: 02:30 PM (local time)

Presenting Author: Rob

Student Presenter: No

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