Conveners
P4.1 Performance Evaluation of the International Monitoring System
- Petr Ekimov (CTBTO Preparatory Commission)
Description
E-poster session with display of each e-poster on an assigned touchscreen
Improving global capabilities for seismic detection of underground nuclear tests may require upgrading and expanding instrument networks in regions of importance, as well as assessing vulnerabilities such as data loss from key monitoring stations. This study uses numerical wavefield propagation software SPECFEM to quantify International Monitoring System (IMS) network performance. We simulate...
The 2024 Experiment, conducted from 16 to 27 September 2024, focused on the production of automatic and analysts generated products. During the experiment, the International Data Centre (IDC) generated a series of Reviewed Event Bulletins (REBs). To ensure an objective comparison, three randomly selected REBs were compared against a baseline bulletin created by an experienced team. The...
Data quality assessments for five BMKG stations (PSI, LEM, BATI, SIJI, and JAY) which included as auxiliary stations in the CTBTO International Monitoring System have been conducted. The Probabilistic Power Spectral Density (PPSD) analysis was applied to determine the level of background noise around the sites to assess the reliability of sensor placements for seismic monitoring. Meanwhile,...
The Anatolian region, characterized by complex fault systems such as the North Anatolian Fault, East Anatolian Fault and the extensively deforming fault systems in the Aegean and Mediterranean regions, serves as a natural laboratory for earthquake studies. These fault systems create a highly dynamic and seismically active tectonic environment. The Kandilli Observatory and Earthquake Research...
The International Monitoring System (IMS) is a unique global network designed to monitor compliance with the Comprehensive Nuclear-Test-Ban Treaty (CTBT). Complementary to three waveform technologies, the 80-station radionuclide network provides continuous worldwide monitoring. This radionuclide network is further supported by 16 specialized laboratories, which offer independent expert...
Extreme wildfires have become more frequent and widespread in recent years, causing negative impacts on society, infrastructure, air quality, terrestrial and aquatic ecosystems. The International Monitoring System (IMS) facilities operate worldwide in remote locations, sometimes in regions regularly suffering from forest fires. This could pose a significant risk for a station’s routine...
The International Data Center produces automatic event bulletins, which are subsequently verified by analysts. Analysis of 2014-2023 data shows that less than 50% of events reported in the first list (SEL1) were also included in the Late Event Bulletin (LEB). Reducing the number of misformed events could significantly ease analyst workloads. To address this, we introduce a method for assessing...
Hourly maps with the average and worst-case event detection capability of the seismic component of the CTBTO’s International Monitoring System have, for many years, been accessible via CTBTO’s secure web portal. The basis for these maps is estimates calculated by the Threshold Monitoring method, which has been part of CTBTO’s processing pipeline since the establishment of the International...
To account for an ageing software and benefit modern computing capabilities, the International Data Centre (IDC) started a major programme ten years ago called IDC seismic, hydroacoustic and infrasound (SHI) Reengineering with the goal of creating a modernized, open-source software for SHI data processing and improving maintainability and extensibility to the system. This poster highlights...
The Provisional Technical Secretariat (PTS) runs a radionuclide network QA/QC programme for samples measured by the International Monitoring System (IMS) radionuclide particulate stations on a periodic and continuous basis. The purpose of the radionuclide network QA/QC programme is to verify station performance (by ensuring that produced data are of acceptable quality, the station poses...
The Atmospheric Transport Modelling (ATM) pipeline is essential for linking radionuclide measurements from the International Monitoring System (IMS) to potential source locations. Operated by the Comprehensive Nuclear-Test-Ban Treaty Organization's International Data Centre (CTBTO-IDC), it has been fully functional for many years. Despite its effectiveness, several components need refinement...
Technical specifications for IMS stations require accuracy of calibration results to be within 5% and 5-degrees for amplitude and phase of the nominal response, respectively. Taking into consideration that the operating temperature for equipment components is specified between -20oC to +45oC, the sensors and dataloggers must assure operational quality within their nominal response specified...
For data generated by seismic monitoring networks to be useful and trustworthy, they must be sufficiently accurate and precise. While it is necessary that seismic instruments comprising networks be appropriately accurate and precise, that is not sufficient, as there are additional factors that determine seismic station accuracy. To help network operators compile and manage a set of necessary...
Since the beginning of the nuclear era, the international community has debated ways to reduce the risks of nuclear weapons and their proliferation. In 1996, the Comprehensive Nuclear-Test-Ban Treaty (CTBT) was adopted by the United Nations General Assembly, with the aim of banning nuclear test explosions. The treaty obliges State Parties to refrain from conducting nuclear tests and includes...
Noise levels at a waveform station can be analysed by computing Power Spectral Density (PSD), which is an important quality indicator for waveform data recorded by the International Monitoring System (IMS) seismic, hydroacoustic and infrasound network. The continuous monitoring of the PSDs as part of the quality control process ensures that the IMS network is operating efficiently, and that...
