Three-element infrasound arrays installed at El Reventador volcano, in Ecuador, for monitoring and scientific purposes. Since 2015, we have progressively installed 3 infrasound arrays within 4 km of the summit. Data are mainly from infraBSU sensors connected to REF TEK 130 and DATA-CUBE digitizers. However, there are intermittent data from Trillium Compact 130 and MB2005 sensors connected to Quanterra Q330 digitizers.