hydro-mechanical process of LUSI mud volcano

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Hydraulic properties of sedimentary rocks in East Java where the disaster of mud eruption (LUSI) was occurred were measured by laboratory tests. Temporal and Spatial pore pressure distribution was evaluated by numerical model based on laboratory results. The numerical results showed that abnormally high pore pressure would have been generated at a clay rich formation that is the origin of erupted mud, and it is mainly caused by the formation of very low permeable layer and rapid sedimentation rate. Rheology measurement showed that viscosity of mud was decreased with increasing of liquid fraction and strain. Our result indicates that overpressure generation and fluid injection to the clay rich formation, both of which induce the reduction of sediment, is one of reasons for LUSI mud eruption.