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Seismoacoustic Yields of Local to Near-regional Distance Explosions Using Distributed Acoustic Sensing (DAS)

Description: 

The high-fidelity and broadband measurements provided by Distributed Acoustic Sensing (DAS) over an extended spatial domain has been shown to be capable of characterizing both traditional seismic sources, such as earthquakes, as well as aerial sources such as bolides. DAS measurements can provide seismic observations which rival those of traditional seismic arrays, while simultaneously providing enhanced constraints on both the atmospheric acoustic and infrasound wavefields, making these measurements uniquely well suited to examine near surface seismo-acoustic sources such as volcanic eruptions and chemical explosions. In this study, we analyze DAS data collected at local to near-regional distances (e.g., ~12 km) from two

near surface chemical explosion test series which occurred in May 2024 near Socorro, NM, in which each test series consisted of 4 one-ton TNT equivalent shots followed by a 10-ton TNT equivalent shot. The DAS data captured both seismic and acoustic waves from all the explosions and provides a crucial demonstration of the capabilities of DAS to record surface explosions at local to near-regional distances. We show that the coda spectral ratio method can overcome the azimuthal and unknown ground coupling limitations of using DAS data for the study of seismic source properties and that a rapidly deployed DAS cable can accurately determine the yield of a small chemical explosion (1-10-ton TNT) at distances of ~12 km using both low-frequency seismic (i.e., <20 Hz) and broadband (i.e., 1-100 Hz) acoustic phases.

Session: Advancements in Forensic Seismology and Explosion Monitoring - IV

Type: Oral

Date: 4/17/2025

Presentation Time: 04:30 PM (local time)

Presenting Author: Brent

Student Presenter: No

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