The January 12, 2010 Haiti earthquake triggered more than 1,000 landslides consisting mainly of disrupted slides and falls in weak limestone. Many of the landslides blocked stream drainages and impounded lakes. The larger landslide dams have already breached, and streams are flowing through them. The landslides extend about 60 kilometers east and west from the earthquake epicenter and across the entire north-to-south extent of the peninsula west of Port au Prince. U.S. Geological Survey geologists Ed Harp and Randy Jibson investigated the landslides.

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