Combinatorial Source Inversion from Displacement and Tilt Measurements at Soufriere Hills Volcano Using a Self-Adapting Evolution Strategy

A method is proposed to invert displacement and tilt measurements from a single monitoring location to constrain the nature of a volcanic pressure source. Evolutionary strategy is applied to a sequence of Mogi solutions and the program is shown capable of distinguishing between depth and volume increment of the magma source, in addition to its 3-dimensional spatial coordinates. The mechanism is applied to Soufriere Hills Volcano to constrain the nature of its single pressure source. Expansion to a two source scenario is also sought, but only one of the sources may be correctly constrained while the second is narrowed to several equally valid possibilities. The program is shown incapable of distinguishing between source pressure and radius for single or multiple sources.