This fault represents the tectonic boundary of the North
American and Caribbean plates close to the Mexico–Guatemala border.
The movement along this fault has produced V-shaped valleys in
Motozintla with steep (N30°) unstable slopes made of highly fractured
metamorphic and intrusive rocks. Such conditions have produced
hundreds of mass movement processes (–) such as rock falls, flows,
avalanches and landslides (Sánchez-Núñez et al., 2012).