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South Coast Geological Society

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Meeting Date: Monday, October 12th
    - Social Hour Begins at 6:00PM

Location (Map Below): Doubletree Club by Hilton 7 Hutton Centre Dr., Santa ana

Speaker: Dr. Hugo Loaiciga, P.E.

Topic: Landslides: the role of variable groundwater and earthquakes


This lecture presents current knowledge about the application of the limit-equilibrium method and the specification of pseudo static equivalent seismic forces to assess the stability of slopes threatened by variable groundwater, earthquakes, or both. The paper presents useful slope-stability results for long slopes, circular failures surfaces, and compound failure slip surfaces. Key issues reviewed in the paper are the specification of shear strength of soils, the effect of liquefaction and lay softening on seismic slope stability. Real world examples of slope stability are presented, in particular, the Oso landslide that killed 43 people in 2014 in the state of Washington. It is shown in the lecture that landslide occurrence is influenced by short term stresses but also by conditions for failure that have dynamic structural controls that act over millennia. A recent paper on the subject matter will be distributed to attendants free of charge.

Speaker Information:

Hugo A. Loaiciga, Ph.D., P.E., is professor of Hydrology at the University of California, Santa Barbara. He has been working on the subject of groundwater and landslide activity since 1990, both as researcher and consultant. Dr. Loaiciga has authored 211 scientific/technical works and has consulted for various agencies nationally and internationally.

Address: 7 Hutton Dr., Santa Ana, CA

Meal: Regular or Vegetarian

Cost: $30 (member), $35 (non-member), $15 (Student/Professor)

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