@article{ref1,
title="Measurement and characterization of infrasound from a tornado producing storm",
journal="Journal of the Acoustical Society of America",
year="2019",
author="Elbing, Brian R. and Petrin, Christopher E. and Van Den Broeke, Matthew S.",
volume="146",
number="3",
pages="e1528-e1528",
abstract="A hail-producing supercell on 11 May 2017 produced a small tornado near Perkins, Oklahoma (35.97, -97.04) at 2013 UTC. Two infrasound microphones with a 59-m separation and a regional Doppler radar station were located 18.7 and 70 km from the tornado, respectively. Elevated infrasound levels were observed starting 7 min before the verified tornado. Infrasound data below ∼5 Hz was contaminated with wind noise, but in the 5-50 Hz band the infrasound was independent of wind speed with a bearing angle that was consistent with the movement of the storm core that produced the tornado. During the tornado, a 75 dB peak formed at ∼8.3 Hz, which was 18 dB above pre-tornado levels. This fundamental frequency had overtones (18, 29, 36, and 44 Hz) that were linearly related to mode number. Analysis of a larger period of time associated with two infrasound bursts (the tornado occurred during the first event) shows that the spectral peaks from the tornado were present from 4 min before to 40 min after tornadogenesis. This suggests that the same geophysical process(es) was active during this entire window.<p /> <p>Language: en</p>",
language="en",
issn="0001-4966",
doi="10.1121/1.5124486",
url="http://dx.doi.org/10.1121/1.5124486"
}