Following recent analysis of infrasound signals generated by the 2018-Dec-18 Bering Sea bolide, it became apparent that the Comprehensive Nuclear-Test-Ban Treaty Organisation (CTBTO), International Data Centre (IDC), Reviewed Event Bulletin (REB) observed celerity for the closest station (~1200 km distance) was outside the bounds of the Brachet et al. (2010) model. Using the signal arrival...
The Central and Eastern European Infrasound Network (CEEIN) has been operational since 2019 as a collaboration of Czech, Austrian, Hungarian, Ukrainian and Romanian research institutes. For this study five infrasound arrays were selected from the CEEIN. Over 70,000 detections were processed by the Progressive Multi Channel Correlation method and classified manually afterwards using ground...
The department of Seismology and Acoustics (RDSA) at the Royal Netherlands Meteorological Institute (KNMI) monitors seismic and acoustic activity in the Netherlands with a dense network of seismometers and infrasound sensors. A important motivation for measuring infrasound in the Netherlands is to discriminate between vibrations originating from the solid earth, e.g. earthquakes, and from the...
Seismo-acoustic waveform model development serves to improve both precision and accuracy in event characterization estimates through the application of more robust travel time models for infrasound signal propagation. Development requires the ability to validate models with real data against meaningful metrics. Comparisons across a suite of ground truth (GT) events provides the ability to...
The infrasound array ISCO was installed 2021 on the grounds of the Conrad-Observatory in Austria. Since 2022, a large number of signals caused by production blasting in a nearby quarry have been recorded and analysed. The aim of this study is to reveal source and Green's function of the observed signals. We start from the hypothesis that the interaction of the rock masses with the atmosphere...
Infrasound signals are used to monitor various anthropogenic and natural sources. To determine accurate source locations and energy, an accurate model of wind and temperature from the surface up to the lower thermosphere is necessary, hence operational NWP products are of great importance for routine infrasound monitoring activities. However, many of these models focus on tropospheric...
Accurate modeling of infrasound transmission losses (TLs) is essential to assess the performance of the global International Monitoring System infrasound network. Among existing propagation modeling tools, parabolic equation method (PE) enables TLs to be finely modeled, but its computational cost does not allow exploration of a large parameter space for operational monitoring...
The detection capability of the International Monitoring System (IMS) deployed to monitor compliance with the Comprehensive Nuclear-Test ban Treaty (CTBT) is highly variable in space and time. Previous studies estimated the source energy from remote observations using empirical yield-scaling relations. However, these relations simplified the complexities of infrasound propagation as the wind...
Recent advances in machine learning have shown that neural networks can approximate operators through specialized architectures known as neural operators. In this work, we investigate the use of Fourier Neural Operators (FNOs) to model the physics of infrasound propagation in randomly layered media, mapping sound speed fields to acoustic waveforms. This method is evaluated by predicting the...
Infrasound propagation depends on the winds and temperature in the atmospheric column. These are highly variable, making it difficult to predict propagation conditions in the future based on those in the past. Recently, this problem has been addressed by studying the statistical properties of historical atmospheric profiles in order to generate statistical models for the signal propagation....
An event-specific localization for regional infrasonic analysis has recently been developed using a Bayesian statistical framework and time-reversed ray tracing methods. Auxiliary parameters previously introduced to solve the transport equation as well as identify eigenrays are used to map confidence in direction-of-arrival of detected signals into spatial and temporal variances in the...
Finite-difference methods are widely used to simulate infrasound propagation in the atmosphere. Flexibility of finite-difference scheme allows to implement highly heterogeneous media for sound propagation with complex source models. Full 3-D finite-difference methods have been utilized for local infrasound propagation with pronounced topography and showed that the 3-D nature of topography and...
