The information found here reflects completed USGS work. The content of this page is static and has not been updated since the mid 2000's.
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.