New info from the Haiti quake -
... Now a new study finds that in addition to the underlying geology, the geometry of local surface features contributed to the earthquake’s intensity as well. Susan E. Hough, a seismologist with the United States Geological Survey, and her colleagues found evidence that the shaking was amplified along a narrow ridge of hard rock south of the central city. The ridge was home to a popular hotel and other relatively well-built structures that were destroyed.

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