Earthquakes in Mexicali: On the San Andreas Fault System

Yes. Mexicali, the capital of Baja California, faces high earthquake risk. The city sits in the Mexicali Valley, on the boundary between the Pacific and North American plates, along the southern extension of the San Andreas fault system and the Cerro Prieto fault. It is one of the tectonically most active areas of northwestern Mexico, with numerous faults capable of generating large-magnitude earthquakes.

The most memorable earthquake is the El Mayor-Cucapah earthquake of 4 April 2010, magnitude 7.2, centred south of Mexicali, which caused casualties, significant structural damage and soil liquefaction in the valley. The region has suffered other significant historical earthquakes, and the geothermal activity at Cerro Prieto reflects the intense tectonic dynamics of the area.

Because of its position on the transform-fault system that connects with San Andreas, Mexicali is classified as a high earthquake-hazard zone. The valley's soft, sedimentary soil amplifies seismic waves and favours liquefaction, which is why earthquake-resistant design and compliance with building codes are especially important in the city.