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What's Shaking in Joshua Tree?
Aerial photo of part of the Hector Mine earthquake surface rupture. Arrows and offset tire tracks show the direction the ground moved. This kind of side-by-side movement is typical of strike-slip faults. Photo courtesy of Paul "Kip" Otis-Diehl, USMC, 29 Palms. Click here to see more!
A magnitude 7.1 earthquake rocked
the Joshua Tree National Park region at 2:46 a.m. local time Saturday,
October 16, 1999. The event was located in the Mojave desert, about 47
miles east-southeast of Barstow and 32 miles north of Joshua Tree.
The earthquake occurred on the Lavic Lake fault, which
slices in a north-northwest direction through the eastern
Mojave shear zone. Scientists have identified a 40-kilometer long surface
the Twenty Nine Palms Marine Base. So far, a maximum
offset of 3.8 - 4.7 meters was measured.