Infrasound signal received at station I20EC (located on the Galapagos Islands, Ecuador) at about 3137 km from the recorded event on 22 June 2019 between 22:04:10 and 02:04:10 UT, processed with PMCC. Top: PMCC result is shown for the entire investigated time range; the colours indicate wave directions (back azimuths). Middle: part of the signal associated with the fireball event. The fireball was identified from about 00:12 UT until 00:34 UT. The derived back azimuth of the recorded infrasound signal is colour-coded as well, together with its apparent velocity for the analysed frequency bands. Bottom: thefiltered (based on the signal’s frequency range) and stacked beam of the station is depicted for the same time interval.