Typical infrasound signals from explosions at selected volcanoes around the world. (figure from Fee, D., and R. S. Matoza, 2013, An overview of volcano infrasound: From hawaiian to plinian, local to global, Journal of Volcanology and Geothermal Research, 249, 123-139, doi: 10.1016/j.jvolgeores.2012.09.002 .
Image courtesy of the AVO/UAF-GI.