Harri Geiger and Frances Deegan, from the Department of Earth Sciences, Uppsala Universitly, Sweden, will present the Department of Geological Sciences seminar, with a talk entitled, "Magma plumbing for the 2014-2015 Holuhraun eruption, Iceland/Augite and enstatite pyroxene standards for SIMS oxygen isotope analysis and their application to Merapi volcano, Sundra arc, Indonesia"