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Distributed Acoustic Sensing Technology in Seismological Monitoring: A Validation Through Numerical Modeling of 3D Wave Propagation

Description: 

The Comprehensive Nuclear-Test-Ban Treaty (CTBT) International Monitoring System (IMS) is a unique global network designed to detect any source of nuclear explosion underground, underwater or in the atmosphere and verify violations of the Treaty. The network is close to completion and is based on four complementary verification technologies (seismic, infrasound, hydroacoustic and radionuclides) with a total of 321 monitoring stations and 16 laboratories hosted by 89 Countries around the globe. The IMS aims at employing the most effective and latest available technologies, working for constant improvement of the verification regime to ensure a state-of-the-art network.

In the latest years, the use of Distributed Acoustic Sensing (DAS) interrogators has been introduced as a novel tool for studying the Earth systems, spreading in seismic monitoring. DAS instrumentation paired with fiber optic cables offers availability of dense sampling linear deployment of ground motion sensors, enabling unprecedented spatial resolution of seismic measurements. While the analysis of DAS data is still an on-going challenge, both for amount of data and its physical interpretation, the availability of such unique datasets offers new possibilities for studying processes occurring close to the Earth’s surface. These reasons seem to indicate the DAS technology as an innovative tool for traditional seismic networks. Investigating its potential use within scientific networks, which might in future complement the information of the IMS network, is a matter of interest.

This study addresses the effectiveness of the DAS technology in recording man-made events, via the synthetic simulation of wave propagation in a layered Earth model and compares the detection potential with respect to a network of seismic stations with similar geometry. The spectral element method for simulating the seismic wave propagation within a volume encompassing crust and upper mantle is used to reconstruct both ground motion and strain-rate time-series at regional distances from the source.

Session: Advancements in Forensic Seismology and Explosion Monitoring [Poster]

Type: Poster

Date: 4/17/2025

Presentation Time: 08:00 AM (local time)

Presenting Author: Irene

Student Presenter: No

Invited Presentation: 

Poster Number: 82

Authors