Conveners
O2.1 Characterization of Treaty-Relevant Events
- Mario Zampolli (CTBTO Preparatory Commission)
- Mohamed Nabil Mohamed ElGabry (National Research Institute of Astronomy and Geophysics (NRIAG))
The full moment tensor solution (MTS) allows characterisation of the source mechanism by resolving the six independent components of the source moment tensor. Determining the proportion of isotropic and deviatoric moment released by a source is essential to distinguish between explosion and earthquake sources. However, complications occur because explosions can produce deviatoric deformation...
Research on Graph Neural Networks (GNNs) has advanced rapidly, with recent architectures successfully applied to seismological tasks such as earthquake source characterization and event association. Inspired by advancements in traffic forecasting and temporal knowledge graph completion, we propose dynamic GNNs that integrate graph convolutional layers and autoencoders to capture...
Global seismic monitoring allows for robust real-time analysis to provide useful information about seismic events to assist in earthquake emergency response and for international monitoring efforts of underground nuclear explosions (UNE) and nuisance events. Seismic explosion data is limited but is useful ground truth information for characterization studies and has been shown to be useful...
The three-dimensional (3D) spatial analysis of radioxenon isotopic activity ratios can be used to determine the source type of a nuclear event without any knowledge of the time of its generation. This method requires at least a triple detection from the same sample among the four CTBT-relevant radioxenon isotopes, which are 131mXe, 133mXe, 133Xe, and 135Xe. The 3D space of three different...
Research into monitoring underground explosions under the Comprehensive Nuclear-Test-Ban Treaty (CTBT) focuses on fully utilizing International Monitoring System (IMS) data to detect events of interest to the CTBT regime. For example, the Punggye-ri test site in the DPRK has been experiencing aftershock activity caused by large underground explosions for the past eight years. The use of...
The data fusion automatic pipeline at the CTBTO aims to provide the most complete summary of signals observed by the International Monitoring System (IMS) by linking event information formed from seismic, hydroacoustic and infrasound (SHI) detections with radionuclide detections. The sensitivity of an IMS station sampling period to a possible release location is estimated using backward...
