Disruption of Long-Term Effusive-Explosive Activity at Santiaguito, Guatemala Lamb, Oliver D. Álvarez Ruiz, Isaac Volcano-seismology Eruption chronology Volcanic explosions Multiparametric monitoring Thermal infra-red imaging Rapid transitions in eruptive activity during lava dome eruptions pose significant challenges for monitoring and hazard assessment. A comprehensive understanding of the dynamic evolution of active lava dome systems requires extensive sets of multi-parametric datasets to fully constrain and understand shifts in eruptive behavior, but few such datasets have been compiled. The Santiaguito lava dome complex, Guatemala, is a remarkable example of an open-vent volcanic system where continuous eruptive activity has typically been characterized by cycles of effusion and frequent, small to moderate, gas-and-ash explosions. During 2015–2016 the volcano experienced a rapid intensification of activity including large vulcanian explosions, frequently accompanied by pyroclastic density currents. Here we present a chronology of the eruptive activity at Santiaguito from November 2014–May 2017, compiled from field observations (visual and thermal) and activity reports. We also present seismic and acoustic infrasound data collected during the same period, the longest and largest dataset collected at Santiaguito to date. Three major phases of eruptive activity took place during the study period. 2020-02-06T10:22:38Z 2020-02-06T10:22:38Z 2019-02-05 info:eu-repo/semantics/article Lamb OD, Lamur A, Díaz-Moreno A, De Angelis S, Hornby AJ, von Aulock FW, Kendrick JE, Wallace PA, Gottschämmer E, Rietbrock A, Alvarez I, Chigna G and Lavallée Y (2019) Disruption of Long-Term Effusive-Explosive Activity at Santiaguito, Guatemala. Front. Earth Sci. 6:253. http://hdl.handle.net/10481/59483 10.3389/feart.2018.00253 eng http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess Atribución 3.0 España Frontiers Media