pdf Hall, M. L., Steele, A. L., Bernard, B., Mothes, P. A., Vallejo, S. X., Douillet, G. A., … Ruiz, M. C. (2015) Popular

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Sequential plug formation, disintegration by Vulcanian explosions, and the generation of granular Pyroclastic Density Currents at Tungurahua volcano (2013–2014), Ecuador. Journal of Volcanology and Geothermal Research, 306, 90-103.

https://doi.org/10.1016/j.jvolgeores.2015.09.009