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Multi‐Sensor Trajectory Reconstruction of the 24 April 2025 Alaska Fireball and Implications for Planetary Defense.

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Title: Multi‐Sensor Trajectory Reconstruction of the 24 April 2025 Alaska Fireball and Implications for Planetary Defense.
Authors: Scamfer, L. T.1,2 (AUTHOR) ltscamf@sandia.gov, Silber, E. A.1 (AUTHOR), Fries, M. D3 (AUTHOR), Vida, D.4 (AUTHOR), Šegon, D.5 (AUTHOR), Jenniskens, P.6,7 (AUTHOR), Nishikawa, Y.8 (AUTHOR), Sawal, V.1 (AUTHOR), Rector, T. A.9 (AUTHOR)
Source: Journal of Geophysical Research. Planets. Mar2026, Vol. 131 Issue 3, p1-21. 21p.
Subject Terms: Trajectory measurements, Seismology instruments, Astrophysical collisions, Meteoroids, Meteorite analysis
Geographic Terms: Alaska
Abstract: On 24 April 2025 at 18:30:57 UTC, a bright daytime fireball over Southcentral Alaska was detected by 37 seismic stations, 16 single infrasound sensors, and four infrasound arrays, yielding 30 ballistic and multiple fragmentation arrivals. The unprecedented density of seismoacoustic coverage enabled detailed reconstruction of the event using acoustic signals, with fragmentation source locations further guiding the identification of Doppler weather radar signatures of a meteorite fall. Incorporation of a radar‐derived terminal point yielded a final trajectory solution, which agreed closely with an independent optical trajectory solution from video analysis. The reconstructed entry parameters from seismoacoustic analysis indicate a velocity of 25.3 km/s, an entry angle of 19°, and an energy release of ∼38 t TNT equivalent. Assuming a chondritic composition, the pre‐entry object diameter was ∼0.7 m. Using orbital parameters from the optical solution, we estimate meteoroid composition as most likely an L‐type ordinary chondrite. The event occurred in the sub‐Arctic, where space‐based optical systems face challenges in detection, demonstrating the critical role of dense ground‐based seismoacoustic networks in characterizing high‐latitude atmospheric entries. This uniquely well‐recorded event demonstrates the capability of dense seismoacoustic networks to constrain bolide trajectories, energetics, and fragmentation, with radar and optical data providing critical confirmation and complementary perspectives. These results bridge the methodological gap between planetary‐defense monitoring of natural impactors and space‐traffic analyses of artificial reentries, illustrating how multi‐sensor integration can deliver calibration‐grade trajectories even for unpredicted events. Plain Language Summary: When large meteoroids or pieces of space debris enter Earth's atmosphere, they produce shock waves that travel long distances and can be recorded by special microphones (infrasound sensors) and seismometers. On 24 April 2025, a bright fireball crossed the daytime sky over Southcentral Alaska. The object, a large meteoroid about 0.7 m in diameter (roughly the size of a car tire), entered Earth's atmosphere on a shallow path of about 19°. Traveling more than 23 km per second (>50,000 miles per hour) it released energy equivalent to ∼38 tons of TNT before breaking apart. The entry generated acoustic waves which were detected by a dense network of instruments, some as far as 580 km away. Doppler weather radar identified falling debris, and video cameras recorded three bright flashes caused by fragmentation. By combining these data sets, we reconstructed the meteoroid's trajectory with high precision and estimated its size. Because this event occurred in the sub‐Arctic, where space‐based sensors often have limited coverage, it demonstrates how ground‐based monitoring networks can fill observational gaps. This event shows how multi‐sensor data integration can effectively characterize fireball dynamics. These capabilities are important for understanding meteoroid and space‐debris impacts and have applications in planetary defense. Key Points: A dense network of 57 seismoacoustic instruments recorded the 24 April 2025 Alaska fireball, enabling a trajectory reconstructionSeismoacoustic analysis provided meteoroid trajectory and energy estimatesSeismoacoustic methods provide robust post‐event characterization of bolides and space debris reentries, supporting planetary defense [ABSTRACT FROM AUTHOR]
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Description
Abstract:On 24 April 2025 at 18:30:57 UTC, a bright daytime fireball over Southcentral Alaska was detected by 37 seismic stations, 16 single infrasound sensors, and four infrasound arrays, yielding 30 ballistic and multiple fragmentation arrivals. The unprecedented density of seismoacoustic coverage enabled detailed reconstruction of the event using acoustic signals, with fragmentation source locations further guiding the identification of Doppler weather radar signatures of a meteorite fall. Incorporation of a radar‐derived terminal point yielded a final trajectory solution, which agreed closely with an independent optical trajectory solution from video analysis. The reconstructed entry parameters from seismoacoustic analysis indicate a velocity of 25.3 km/s, an entry angle of 19°, and an energy release of ∼38 t TNT equivalent. Assuming a chondritic composition, the pre‐entry object diameter was ∼0.7 m. Using orbital parameters from the optical solution, we estimate meteoroid composition as most likely an L‐type ordinary chondrite. The event occurred in the sub‐Arctic, where space‐based optical systems face challenges in detection, demonstrating the critical role of dense ground‐based seismoacoustic networks in characterizing high‐latitude atmospheric entries. This uniquely well‐recorded event demonstrates the capability of dense seismoacoustic networks to constrain bolide trajectories, energetics, and fragmentation, with radar and optical data providing critical confirmation and complementary perspectives. These results bridge the methodological gap between planetary‐defense monitoring of natural impactors and space‐traffic analyses of artificial reentries, illustrating how multi‐sensor integration can deliver calibration‐grade trajectories even for unpredicted events. Plain Language Summary: When large meteoroids or pieces of space debris enter Earth's atmosphere, they produce shock waves that travel long distances and can be recorded by special microphones (infrasound sensors) and seismometers. On 24 April 2025, a bright fireball crossed the daytime sky over Southcentral Alaska. The object, a large meteoroid about 0.7 m in diameter (roughly the size of a car tire), entered Earth's atmosphere on a shallow path of about 19°. Traveling more than 23 km per second (>50,000 miles per hour) it released energy equivalent to ∼38 tons of TNT before breaking apart. The entry generated acoustic waves which were detected by a dense network of instruments, some as far as 580 km away. Doppler weather radar identified falling debris, and video cameras recorded three bright flashes caused by fragmentation. By combining these data sets, we reconstructed the meteoroid's trajectory with high precision and estimated its size. Because this event occurred in the sub‐Arctic, where space‐based sensors often have limited coverage, it demonstrates how ground‐based monitoring networks can fill observational gaps. This event shows how multi‐sensor data integration can effectively characterize fireball dynamics. These capabilities are important for understanding meteoroid and space‐debris impacts and have applications in planetary defense. Key Points: A dense network of 57 seismoacoustic instruments recorded the 24 April 2025 Alaska fireball, enabling a trajectory reconstructionSeismoacoustic analysis provided meteoroid trajectory and energy estimatesSeismoacoustic methods provide robust post‐event characterization of bolides and space debris reentries, supporting planetary defense [ABSTRACT FROM AUTHOR]
ISSN:21699097
DOI:10.1029/2025JE009440