Characterization of Road Construction Explosions Recorded Along an Ocean-bottom Fiber With Distributed Acoustic Sensing
Description:
Ocean-bottom Distributed Acoustic Sensing (DAS) arrays offer a novel approach to densely sample offshore regions that typically lack seismic instrumentation. This study focuses on characterizing road construction explosions recorded along a telecommunication fiber-optic cable offshore Cordova, AK. Continuous data have been recorded along 50 km of fiber since April 2024 using an AP Sensing DAS interrogator unit. These recordings include seismic waves from over 10 explosions associated with the construction of a new road near Cordova. Clear seismic signals from these explosions, which occurred as close as 10 km from the fiber, are detectable over 30 km along the fiber-optic cable, enabling detailed analysis of the explosion sources. We use a combination of beamforming and coda spectral ratio techniques to characterize the explosion sources, validating our findings with ground truth information provided by the blasting company. Our results demonstrate that DAS data recorded along offshore telecommunication fibers can be used to detect and characterize onshore explosion sources, further supporting the potential of DAS for explosion monitoring in regions with limited seismic instrumentation.
Session: Advancements in Forensic Seismology and Explosion Monitoring - III
Type: Oral
Date: 4/17/2025
Presentation Time: 02:15 PM (local time)
Presenting Author: Brent
Student Presenter: No
Invited Presentation:
Poster Number:
Authors
Loic Viens Corresponding Author lviens@lanl.gov Los Alamos National Laboratory |
Brent Delbridge Presenting Author delbridge@lanl.gov Los Alamos National Laboratory |
Jeremiah Beckett jeremiah@ctcak.coop Cordova Telecom Cooperative, Inc. |
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Characterization of Road Construction Explosions Recorded Along an Ocean-bottom Fiber With Distributed Acoustic Sensing
Category
Advancements in Forensic Seismology and Explosion Monitoring