Volume Flow Rate Estimation for Small Explosions at Mt. Etna, Italy, From Acoustic Waveform Inversion Díaz Moreno, Alejandro Zuccarello, Luciano Rapid assessment of the volume and the rate at which gas and pyroclasts are injected into the atmosphere during volcanic explosions is key to effective eruption hazard mitigation. Here, we use data from a dense infrasound network deployed in 2017 on Mt. Etna, Italy, to estimate eruptive volume flow rates (VFRs) during small gas-and-ash explosions.We use a finite-difference time-domain approximation to compute the acoustic Green's functions and perform a full waveform inversion for a multipole source, combining monopole and horizontal dipole terms. The inversion produces realistic estimates of VFR, on the order of 4 × 104 m3/s and well-defined patterns of source directivity. This is the first application of acoustic waveform inversion at Mt. Etna. Our results demonstrate that acoustic waveform inversion is a mature and robust tool for assessment of source parameters and holds potential as a tool to provide rapid estimates of VFR in near real time. 2019-11-15T10:49:10Z 2019-11-15T10:49:10Z 2019 info:eu-repo/semantics/article Diaz-Moreno, A., Iezzi, A. M., Lamb, O. D., et al, & De Angelis, S. (2019). Volume flow rate estimation for small explosions at Mt. Etna, Italy, from acoustic waveform inversion. Geophysical Research Letters, 46. http://hdl.handle.net/10481/57913 10.1029/2019GL084598 eng info:eu-repo/grantAgreement/EC/FP7/798480 http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess Atribución 3.0 España American Geophysical Union