Pre-eruptive outgassing and pressurization, and post-fragmentation bubble nucleation, recorded by vesicles in breadcrust bombs from vulcanian activity at Guagua Pichincha Volcano, Ecuador - Colombier, Mathieu; Manga, Michael; Wright, Heather; Bernard, Benjamin; deGraffenried, Rebecca; Caceres, Francisco; Samaniego, Pablo; Vasseur, Jeremie; Jakata, K; Cook, Paul; Dingwell, Donald (Journal of Geophysical Research - Solid Earth, 2023)