Self-Potential Studies in Volcanic Environments: A Cheap and Efficient Method for Multiscale Fluid-Flow Investigations

Figure 4

Self-potential map of the whole terminal cone of Piton de la Fournaise (top) and a detailed SP map of the crater (bottom). PB (Pre-Bory), S (Soufrière), and PP (Petit Plateau) are former pit craters surrounding the Dolomieu and Bory craters, affected by major hydrothermal release as shown by the high self-potential values. White-dotted lines represent the collected SP profiles. Self-potential maxima highlight the rift zones of this volcano in consistency with the repartitioning of the fractures and fissures. Before the 2007 eruption, the self-potential data identified underground fluid flow heterogeneities highlighting structures that later controlled the collapse of the Dolomieu crater and the temporary preservation of an eastern plateau. Figure modified from [72].