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The Rio Grande Rift is a geologic rift or valley in the Earth's crust that extends from central Colorado south through New Mexico and into Mexico. It is part of the larger Basin and Range Province, which is characterized by a series of north-south trending basins and mountain ranges. The Rio Grande Rift is about 1,000 miles (1,600 km) long and 100 miles (160 km) wide.
The Rio Grande Rift is a result of the extension or pulling apart of the Earth's crust. This extension is caused by the movement of the North American Plate away from the Pacific Plate. As the plates move apart, the crust in between is stretched and thinned, causing the formation of a rift valley.
The Rio Grande Rift is a seismically active area, with frequent earthquakes. The most recent major earthquake in the rift occurred in 1979, when a 6.4-magnitude earthquake hit the Socorro area. The earthquake caused significant damage to buildings and infrastructure in the area.
The Rio Grande Rift is also a volcanic area, with several active volcanoes in the region. The most famous of these volcanoes is Mount Taylor, which is located near Grants, New Mexico. Mount Taylor is a dormant volcano, but it has erupted several times in the past. The last eruption of Mount Taylor occurred about 11,000 years ago.