1/14/2024 0 Comments Underwater submarine![]() ![]() We would be completely swamped with events. If the system is so sensitive that it detects everything, you will also have 100% probability of detecting false alarms. Whichever type of detector you build, you have to strike a balance between the probability of detecting something and the probability of false alarms. ![]() The automatic processing pipelines are optimized for detecting nuclear explosions. Is this type of analysis done in real time?įor nuclear-explosion detection the CTBTO has a real-time processing pipeline. If you compute the geodesics starting at those points, the two lines cross in a location quite near to the point where the submarine last made contact. Also, because each station has three sensors, based on the delay between the times when the signal reached each of the sensors, you can compute a bearing, and calculate the direction in which the signal was coming from. Two stations picked up a signal: one in Ascension Island, slightly south of the equator in the Atlantic, and the other in the Crozet Islands in the Southern Indian Ocean, half-way between Africa and Antarctica. Six of our underwater stations are equipped with hydrophones. How can you help in the search for the ARA San Juan? The signals are stored and are used for a variety of scientific applications and disaster mitigation. All the information goes to our international data centre in Vienna, and also to our analysts, to examine if there are any events that are of interest with regard to the detection of nuclear explosions. We use four different technologies: seismic, atmospheric infrasound and hydroacoustic, plus the radionuclide stations, which detect traces of radioactive isotopes from possible explosions. The system has 289 stations worldwide and, when complete, it will have 337. How does the international monitoring system work? Nature spoke to CTBTO hydroacoustic engineer Mario Zampolli about the latest search. In 2000, for example, researchers searched its data for signs of the lost Russian submarine Kursk, and in 2014 they used it to try to determine the fate of Malaysian Airlines flight MH370. The CTBTO's system has numerous scientific applications and this is not the first time that it has been put to use in the aftermath of a possible disaster. The submarine is carrying 44 crew members. On November 15, Argentina’s Navy lost contact with the ARA San Juan, a small diesel-powered submarine that had been involved in exercises off the east coast of Patagonia.Ībout a week later, on November 23, the Vienna-based Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO) announced that its International Monitoring System-a network of sensors designed to detect nuclear explosions wherever they happen around the globe-had picked up a sound consistent with that of an explosion near the vessel's last-known location. ![]()
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