Insights into the mechanisms of phreatic eruptions from continuous high frequency volcanic gas monitoring: Rincón de la Vieja volcano, Costa Rica - Battaglia, Angelo; de Moor, J.; Aiuppa, Alessandro; Avard, Geoffroy; Bakkar, Henriette; Bitetto, Marcello; Mora Fernandez, M.; Kelly, Peter; Giudice, Gaetano; Delle Donne, Dario; Villalobos, Hairo (Frontiers in Earth Science, 2019)