Joshua Tree National Park - Faults

Blue Cut Fault in the center of the park can be seen from the hilltop behind Lost Horse Mine. The fault forms the straight, abrupt base of the Hexie Mountains east of Queen Valley. Fault zones are important factors in localizing natural springs. Movement by faults causes impervious zones of shattered rock fragments to form an underground dam forcing ground water to rise. The Oasis of Mara at the visitor center in Twentynine Palms marks the Pinto Mountain fault. The park has four other fault-caused oases that support the native palm tree, Washingtonia filifera.

These oases supply food and water to a wide variety of wildlife and point to the connection between the park’s geology and its wildlife habitat. Will Joshua Tree National Park experience a large earthquake anytime soon? Despite a great amount of recent seismic research, no one can yet predict earthquakes with any accuracy. The earth will continue to shake in Southern California, and most earthquakes will be small— “felt” by seismographs, rarely by people. Occasionally, a larger one will occur, but when or where remains unknown.