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Latin America suffers its share of this destructive force: during the period 1985-1987, earthquakes in Ecuador, Mexico, and El Salvador and a volcanic eruption in Colombia killed more than 36,000 people.

The Nazca Plate, sliding slowly eastward on the earth's mantle, slips under the South American Plate along the Peru-Chile Trench.

A SIMPLIFIED CLASSIFICATION OF MAJOR GEOLOGIC HAZARDS With the present state of technology, most geologic events cannot be prevented or even predicted with any precision.

Landslides are an exception: they can often be prevented.

While this chapter does not go into specific geologic hazard assessment techniques, most of which are well beyond the technical, temporal, and budgetary constraints of integrated development planning studies, it presents and discusses existing information which can and should be used during the Preliminary Mission and Phase I stages of a planning study.