Linked from
The 9 pages that link to Pore water pressure, each with the reason it gives.
LandslideRelated: Rising pore pressure can reduce friction and destabilize a slope.
Mass wastingRelated: Rising pressure reduces the effective contact forces that hold grains together.
Soil liquefactionRelated: Its rapid increase during shaking drives the loss of soil strength.
Submarine landslideRelated: Rising pore pressure can reduce sediment strength and initiate failure.
RockslideRelated: Water pressure can reduce frictional resistance along potential failure surfaces.