text: 80,74,1361305266805964800,1263810665476653057,Denis Vida,"In our new paper, we develop a method to measure energies and trajectories of big fireballs using only nearby seismic and infrasound stations! <LINK> The approach is simple, we just assume fireballs are seismic sources moving at Mach ~50. @westernuScience <LINK> We also provide open-source software for energy and trajectory inversion: <LINK> <LINK> Congrats @LukeFMcFadden on your first publication! More are to come, and I'm sure they will be as amazing as this one!",https://arxiv.org/abs/2102.06574,"Near field acoustical signals from fireballs (ranges<200 km), when detected by dense ground networks, may be used to estimate the orientation of the trajectory of a fireball (Pujol et al., 2005) as well as fragmentation locations (Kalenda et al., 2014; Edwards and Hildebrand, 2004). Distinguishing ballistic arrivals (from the cylindrical shock of the fireball)from fragmentation generated signals (quasi-spherical sources) remains a challenge, but are obtainable through analysis of the acoustic path and the timing observed at ground instruments. Here we describe an integrated computer code, termed the Bolide Acoustic Modelling program or BAM, to estimate fireball trajectories and energetics. We develop a new methodology for measuring energy release from bolide fragmentation episodes solely from acoustic measurements and incorporate this into BAM. We also explore the sensitivity of seismo-acoustic fireball solutions and energy estimates to uncertainty in the underlying atmospheric model. Applying BAM to the Stubenberg meteorite producing fireball, we find the total fireball energy from ballistic arrivals to be approximately $5 \times 10^{10}$J which compares favorably to the optical estimate of $4.36 \times 10^{10}$J. The combined fragmentation energy of the Stubenberg event from acoustic data was found to be $1.47^{+0.28}_{-0.12} \times 10^{10}$J, roughly one third of the ballistic or optical total energy. We also show that measuring fireball velocities from acoustic data alone is very challenging but may be possible for slow, deeply penetrating fireballs with shallow entry angles occurring over dense seismic/infrasound networks. ",Fireball characteristics derivable from acoustic data,3,"['In our new paper, we develop a method to measure energies and trajectories of big fireballs using only nearby seismic and infrasound stations!\n<LINK>\nThe approach is simple, we just assume fireballs are seismic sources moving at Mach ~50.\n@westernuScience <LINK>', 'We also provide open-source software for energy and trajectory inversion: https://t.co/9JDrU9XFVu https://t.co/iUfz7V7zE9', ""Congrats @LukeFMcFadden on your first publication! More are to come, and I'm sure they will be as amazing as this one!""]",21,02,469