A Review of Recent IDA Sensor Performance
Description:
The IDA network, which comprises one-third of the Global Seismic Network (GSN), consists of 40 high-quality seismic stations located around the world instrumented to support high-fidelity recording of very low-amplitude and very long-period seismic signals.
IDA stations are distributed about 50/50 between those having vault and borehole-focused infrastructure. At those with the latter, shallow (~7 m) boreholes complement deep (~100 m) boreholes. Both weak- and strong-motion sensors are included in a standard IDA station instrumentation configuration.
The network-wide upgrade of the no-longer-supported Geotech KS-54000 and Streckeisen STS-1 instruments to modern very-broadband (VBB) STS-6A and T360 seismometers (manufactured by Streckeisen and Nanometrics, respectively) is nearly complete. These "primary" seismometers are complemented with "secondary" instruments---most commonly a Streckeisen STS-2.5 or STS-5A, or a Nanometrics T120---installed on the pier or in the shallow borehole, depending upon station infrastructure.
The ongoing upgrade offers the opportunity to carry out a broad examination of the instrument performance over a period of about a decade. Here we present results of that investigation.
Anomalies in instrument behavior, identified via power spectral density analysis of ambient seismic noise and variation from nominal instrument response, are viewed as general proxies for instrument anomalies and hardware failures. Performance tracking has been conducted since the beginning of the VBB sensor upgrades about a decade ago. The overall performance of VBB instrumentation to date has been somewhat worse than expected, with a significant number of IDA STS-6A complete failures attributed to a faulty electronic component and additional failures due to other problems.
Session: Network Seismology: Recent Developments, Challenges and Lessons Learned [Poster Session]
Type: Poster
Date: 5/1/2024
Presentation Time: 08:00 AM (local time)
Presenting Author: Robert
Student Presenter: No
Invited Presentation:
Authors
Robert Mellors Presenting Author Corresponding Author rmellors@ucsd.edu University of California, San Diego |
Carl Ebeling cebeling@ucsd.edu University of California, San Diego |
Peter Davis pdavis@ucsd.edu University of California, San Diego |
Jonathan Berger jberger@ucsd.edu University of California, San Diego |
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A Review of Recent IDA Sensor Performance
Session
Network Seismology: Recent Developments, Challenges and Lessons Learned