Acoustic direct line-of-sight distance measurements offshore Etna volcano by means of a network of five transponders. The data include travel times between all transponders, pressure, temperature (inside pressure tube), sound velocity, and inclination.
Supplement to: Urlaub, Morelia; Petersen, Florian; Gross, Felix; Bonforte, Alessandro; Puglisi, Giuseppe; Guglielmino, Francesco; Krastel, Sebastian; Lange, Dietrich; Kopp, Heidrun (2018): Gravitational collapse of Mount Etna's southeastern flank. Science Advances, 4(10), eaat9700