Speaker
Description
The explosive fragmentation of large meteoroids is one of the most significant sources of infrasonic waves. In the absence of atmospheric nuclear tests since 1980, bolide explosions have become key infrasound sources for calibrating and testing the instrument sensitivity of the International Monitoring System (IMS). Moreover, detecting meteoroid explosions with infrasound arrays is crucial for estimating their potential impact and frequency of occurrence. To evaluate the sensitivity of IMS instruments, we applied the Progressive Multi-Channel Correlation (PMCC) method to the infrasound records generated by the meteoroid explosion over Japan on 29 November 2020. Reliable results were obtained for only two stations located at approximately 412 km (Japan) and 1238 km (Russia). The triangulation of both stations was used to locate the infrasound source near Shingu, in Wakayma Prefecture, Japan. The eyewitness reports also corroborate the estimated location. The meteoroid explosion had a yield of less than 1 kiloton TNT, indicating that the IMS network is capable of detecting infrasound events with very low yields.
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