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Grand Canyon lies on the southern end of the Intermountain West seismic belt. [84] At least 35 earthquakes larger than 3.0 on the Richter Scale occurred in the Grand Canyon region in the 20th century. [85] Of these, five registered over 5.0 on the Richter Scale and the largest was a 6.2 quake that occurred in January 1906. [85]
The Colorado Plateau which includes the Grand Canyon is the result of broad tectonic uplift followed by river erosion. [4] When mountains rise slowly, either due to orogenic uplift or other processes (e.g., rebound after glaciation), an unusual feature known as a water gap may occur.
Conditions in the Grand Canyon region are generally dry, but substantial precipitation occurs twice annually, during seasonal pattern shifts in winter (when Pacific storms usually deliver widespread, moderate rain and high-elevation snow to the region from the west) and in late summer (due to the North American Monsoon, which delivers waves of ...
In the Grand Canyon, the Toroweap-Hurricane Fault causes a change of surface rock expression in the canyon's west, on the South Rim. The Esplanade Sandstone an erosion resistant member of the Supai Group creates a platform called The Esplanade. The landform is upstream on the Colorado River, South Rim, across from Toroweap Point, and the ...
The disconformity between the Redwall Limestone and the Supai Group records a time of regional uplift, in which the Grand Canyon area was elevated by at least several hundred feet. Erosion carved channels in the Redwall Limestone that reach a maximum depth of 400 feet (120 m) in the western Grand Canyon. [10]
Grand Canyon National Park is a national park of the United States located in northwestern Arizona, the 15th site to have been named as a national park.The park's central feature is the Grand Canyon, a gorge of the Colorado River, which is often considered one of the Wonders of the World.
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