For the First time in Algeria, a fireball was characterized for the first time in Algeria using 14 seismic stations from the Algerian digital seismic network and two newly installed infrasound stations (Network in progress). The event occurred on the night of May 7, 2023, in an area not far southwest of the Algerian capital. Infrasound signals were employed to determine the location of the...
On 7 February 2022, a large meteoroid entered the Earth’s atmosphere around 500km off the coast of Namibia and South Africa. NASA’s Center for Near Earth Object Studies (CNEOS) lists the event as a fireball with an impact energy of 7kt TNT equivalent. This energy estimate is about 60 times lower than for the 2013 Chelyabinsk fireball (440kt, CNEOS). For Chelyabinsk, IMS infrasound data...
Utilizing infrasound stations of the International Monitoring System (IMS) network has become increasingly prevalent over the past decade due to their ability to detect bolides. Infrasound data are often complemented by optical observations, providing essential ground truth information. We present infrasound detections of a bolide that exploded over Australia on 20 May 2023. The bolide entered...
Global celerity and back azimuth deviation models are used within infrasound detection association and event location estimation algorithms. A previous study, InfGEM (Infrasound Global Empirical Models), used a database of ground-truth mine blasts and chemical explosions to derive a celerity-range model, using the arrival time of the maximum peak-to-trough amplitude to calculate celerity for...
A rare class of meteoroids known as earthgrazers enter the atmosphere at shallow angles, with some returning to space after a brief hypersonic flight through the upper atmosphere. We present the detection and analysis of infrasound from a rare horizon-to-horizon earthgrazer event observed over northern Europe on September 22, 2020. The fireball generated ballistic shockwaves which were...
Rocket launches are a source of infrasound detectable at infrasound arrays in thousands of kilometers distance. Recorded signatures originate from the ignition, launch, supersonic movement, stage separation and reentry of rockets within the first about 100 kilometers of altitude in the atmosphere. We use IMS infrasound data to localize and characterize rocket launches all over the world....
On 24 September 2023, NASA's OSIRIS-REx mission achieved a significant milestone by successfully returning particles from a nearby asteroid to Earth via a Sample Return Capsule (SRC). The SRC generated shock waves as it entered the atmosphere, traversing California, Nevada and Utah before landing at the Utah Test and Training Range (UTTR). Since SRCs are well-characterized objects with known...
In a recent paper, Phil Blom et al. [JASA 155 (3), March 2024] developed
a method to predict regional infrasound originating from supersonic sources. These results were integrated into InfraGA, LANL’s infrasound ray-tracing library. The September 2023 re-entry of the OSIRIS-Rex capsule presented an excellent opportunity to test these results against a known source. Three arrays were deployed...
Last autumn, small-scale events have occurred near Tori-shima, in the Izu-Bonin Islands arc, located about 600 km south of Tokyo. At least 14 T-phases were observed at seismic stations around Tori-shima between 19:00 and 21:30 UTC on 8th October 2023. These T-phases were estimated to have been caused by the events whose hypocenters were determined by the US Geological Survey to be near...
There is evidence from previous works that global ambient noise infrasound data recorded on by the IMS station network are highly sensitive to the stratospheric polar vortex and its regimes.
Vorobeva et al. (2024) used a data-driven approach to map between microbarom-band array signal processing output from the three northernmost IMS infrasound stations and the ERA5 re-analysis polar cap...
The deployment of ground-based seismic or infrasound instruments can be complex and costly in remote regions on Earth, or in harsh environments like the surface of Venus. Recent studies have demonstrated that as an alternative, balloon platforms can be used to monitor seismic activity from the atmosphere, at a comparably low operational cost. Such balloons carry pressure sensors and can record...
The 2022 climactic eruption of the Hunga volcano in the Kingdom of Tonga generated broadband acoustic waves observed over 10,000 kilometers away on pressure and seismic sensors in Alaska. The arrival of high-amplitude acoustic energy at a regional network of colocated sensors provides a unique opportunity to examine acoustic-to-seismic coupling and use these observations to estimate crustal...
