Magma convection and mixing dynamics as a source of Ultra-Long-Period oscillations Supplementary Figures A. Longo1, P. Papale1, M. Vassalli2, G. Saccorotti1, C.P. Montagna1, A. Cassioli3, S. Giudice1, E. Boschi1 1 Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Pisa, Via della Faggiola 32, 56126 Pisa, Italy 2 University College Dublin, School of Geological Sciences, Belfield, Dublin 4, Ireland 3 Dipartimento di Sistemi e Informatica, Università di Firenze, Via di S. Marta 3, Firenze, Italy This Electronic Supplementary Material a series of figures showing additional pressure time series computed at several different points along the simulation domain boundary. Supplementary Figures S1-11 below illustrate, for the Mount Etna and Campi Flegrei simulations described in the paper, pressure oscillations computed at specific points along the boundary between the simulated magmatic system and the host rocks. In each figure, the picture on the left shows, as a red point, the location of the computed pressure variations reported on the right. Each bottom diagram shows the de-trended pressure variations (de-trending function reported as a red line in the corresponding upper diagram). Mount Etna case Figure S1 Figure S2 Figure S3 Figure S4 Figure S5 Campi Flegrei case Figure S6 Figure S7 Figure S8 Figure S9 Figure S10 Figure S11