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Hydrogeologic Hazards: From Piping to Large Earthquakes

H. A. Loaiciga
Department of Geography, University of California, Santa Barbara, CA, [email protected]

Ground water is a powerful agent of subsurface erosion, processes such as seepage forces and piping being important for landscape evolution and determining the stability of man-made earthen water works. In addition, ground water effects terrain stability by governing the pore pressure and effective stress that is crucial in the triggering of landslides, in land subsidence and soil consolidation, and in facilitating the rupture of the earth crust at seismogenic depths that cause earthquakes large and small worldwide. This paper reviews the theory behind ground water as an agent of geologic hazards and presents examples of related disasters within the Pacific region.

AAPG Search and Discovery Article #90088©2009 Pacific Section Meeting, Ventura, California, May 3-5, 2009