System Monitoring, Telemetry Quality Control and DAS Testing at SCSN
Description:
The Caltech/USGS Southern California Seismic Network (SCSN) is a state-of-the-art digital ground motion seismic network. It develops and maintains data acquisition and delivery systems that support the rapid generation of earthquake information products, such as event origins, magnitudes, ShakeMap, and Earthquake Early Warning through ShakeAlert.
Tools have been developed to evaluate the system's state of health through regular measurements of data transport latency and telemetry link bandwidth between dataloggers and the data center. These tools enable performance analysis of connections to ensure they meet the requirements. Additionally, a quantitative framework has been introduced to evaluate station locations within the ShakeAlert mission. This approach calculates each station's expected contributions in terms of quake detection likelihood and the benefits to nearby populations, allowing for optimized station placement to enhance the mission's overall effectiveness.
To test the performance of seismic instruments and telemetry systems during simulated shaking, a bi-axial shake table is employed. By recreating past seismic events and analyzing system responses, we can design more robust sites and collaborate with field engineers on the installation improvements.
In addition, a lab-scale experiment was designed to investigate the DAS response and the influence of cable properties. This experiment utilizes a shake table to apply controlled deformations to a fiber cable, enabling accurate characterization of the instrument response. The setup also facilitates the examination of DAS phase unwrapping errors and the material behavior of cables under varying strain conditions.
SCSN has begun integrating DAS technology into its operations. A DAS instrument is currently deployed in the Ridgecrest, CA area, transforming a 100-km telecom cable into a 10,000-channel seismic array that is analyzed using PhaseNet-DAS. Selected waveforms and phase times from 18 DAS channels are incorporated into existing earthquake monitoring workflows, demonstrating the potential of DAS technology to enhance seismic monitoring capabilities.
Session: Network Seismology: Recent Developments, Challenges and Lessons Learned [Poster]
Type: Poster
Date: 4/15/2025
Presentation Time: 08:00 AM (local time)
Presenting Author: Igor
Student Presenter: No
Invited Presentation:
Poster Number: 30
Authors
Igor Stubailo Presenting Author Corresponding Author stubailo@caltech.edu California Institute of Technology |
Ettore Biondi ebiondi@caltech.edu California Institute of Technology |
Rayomand Bhadha rayo@caltech.edu California Institute of Technology |
Glenn Biasi gbiasi@usgs.gov U.S. Geological Survey |
Mark Alvarez malvarez@usgs.gov U.S. Geological Survey |
Michael Watkins mwatkins@caltech.edu California Institute of Technology |
Allen Husker ahusker@caltech.edu California Institute of Technology |
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System Monitoring, Telemetry Quality Control and DAS Testing at SCSN
Session
Network Seismology: Recent Developments, Challenges and Lessons Learned