Figure 2. Estimated rupture areas of past large earthquakes in central America (red circles and rectangle) compared to estimated locked slip zones from GPS (full locking is approximately 9 cm, the plate motion in 1 year). A is 1950, B is 1978, C is 1983, D is 1990, E is the 1992Nicaragua tsunami earthquake, estimated from 30 days of aftershocks. Red triangles are Quaternary volcanoes. From Norabuena et al. [2003].