Advancements in Quality Assurance for the Comprehensive Nuclear-test-ban Treaty International Monitoring System and Calibration Challenges for Seismic and Infrasound Technologies
Description:
The International Monitoring System (IMS) network of the Comprehensive Nuclear-Test-Ban Treaty (CTBT) relies on four technologies: seismic, infrasound, hydroacoustic and radionuclide. The draft IMS Operational Manuals for waveform technologies outline the requirements for establishing, maintaining and verifying the performance of IMS stations. Since 2011, the Provisional Technical Secretariat (PTS) for the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO) has collaborated with the global community to establish a robust quality assurance framework for IMS measurements, with focus on infrasound technology: significant progress in setting standards and refining calibration methods was achieved.
Recent PTS activities focused on seismic technology. The IMS seismic stations are required to perform regular calibration, maintaining a maximum deviation of five percent in amplitude and five degrees in phase over the frequency range relevant for detecting nuclear explosions. This necessitates precise calibration processes to ensure consistent measurement standards between IMS facilities.
Currently, seismic stations undergo electrical calibration once a year. However, this approach is not traceable and may not capture long-term trends influenced by multiple factors. Alternative or complementary methods, such as calibration by comparison already used in infrasound technology, might provide additional insights and support long-term measurement accuracy for seismic technology.
This work reviews recent advancements in seismic sensor quality assurance and invites the seismic community to collaborate on developing alternative calibration methods to improve traceability and measurement reliability.
Session: Fifty Years and Beyond of Broadband Seismic Instrumentation: Performance, Precision and Uncertainties - I
Type: Oral
Date: 4/16/2025
Presentation Time: 05:15 PM (local time)
Presenting Author: Benoit
Student Presenter: No
Invited Presentation:
Poster Number:
Authors
Benoit Doury Presenting Author Corresponding Author benoit.doury@ctbto.org Preparatory Commission for the CTBTO |
Paola Campus paola.campus@ctbto.org Preparatory Commission for the CTBTO |
Alfred Kramer alfred.kramer@ctbto.org Preparatory Commission for the CTBTO |
Jean-Baptiste Le Blanc jean-baptiste.leblanc@ctbto.org Preparatory Commission for the CTBTO |
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Advancements in Quality Assurance for the Comprehensive Nuclear-test-ban Treaty International Monitoring System and Calibration Challenges for Seismic and Infrasound Technologies
Category
Fifty Years and Beyond of Broadband Seismic Instrumentation: Performance, Precision and Uncertainties