EEW Station Connectivity (Latency) Is Shockingly Low. Here’s How We Know
Description:
Telemetry plays a crucial role in the operations of Earthquake Early Warning Systems, such as ShakeAlert, along the West Coast of North America. Previous studies, such as Stubailo et al. (2021), have shown that telemetry systems can become overloaded during large seismic events. Commonly this is due to increased data volume caused by reduced compression efficiency. To explore this issue, we evaluated data volume variability at seismic monitoring stations in Northern California during the December 5 M7.0 Offshore Cape Mendocino Earthquake. We also assessed typical telemetry quality by analyzing latency (archived in real-time as the channel L1Z) across multiple pathways to evaluate the robustness of the connectivity infrastructure. Factors such as data logger type, telemetry type, distance from the data center, and pathways to other partner data centers were investigated to determine which characteristics most significantly affect telemetry health and data delivery efficiency.
Preliminary analysis of latency values for a subset of BK stations received at the University of Washington, Caltech, and UC Berkeley revealed no noticeable delays attributed to the data pathway. Latency data for the same set of BK stations was consistent across these partner agencies when evaluated during the same time period.
When examining latency by telemetry type for all BK stations, no significant variations were observed. However, an analysis of latency by data logger type revealed distinct differences. Comparisons with similar analyses performed at Caltech for CI stations showed comparable patterns in the relative quality and speed of latency based on logger type, indicating a correlation between logger characteristics and telemetry performance.
Session: Performance and Progress of Earthquake Early Warning Systems Around the World - I
Type: Oral
Date: 4/16/2025
Presentation Time: 08:30 AM (local time)
Presenting Author: Fabia
Student Presenter: No
Invited Presentation:
Poster Number:
Authors
Fabia Terra Presenting Author terra@berkeley.edu University of California, Berkeley |
Igor Stubailo Corresponding Author stubailo@caltech.edu California Institute of Technology |
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EEW Station Connectivity (Latency) Is Shockingly Low. Here’s How We Know
Session
Performance and Progress of Earthquake Early Warning Systems Around the World