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USGS Geology in the Parks

Joshua Tree National Park- on shaky ground!

What's Shaking in Joshua Tree?

Map showing eq.info
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 rupture within the Twenty Nine Palms Marine Base. So far, a maximum offset of 3.8 - 4.7 meters was measured.

Site contents

Hector Mine earthquake
Shaded Relief Map: Hector Mine earthquake (10/19/99)
- 130 MB image
Aerial photos of Hector Mine earthquake rupture zone
Map of seismograph network in the Joshua Tree region
See a Hector Mine earthquake seismogram
Map showing recent Hector Mine earthquake activity


Links to other Earthquake Information

All About Earthquakes

Earthquake ABC - for kids! For parents!
Putting Down Roots in Earthquake Country

More Earthquake Links

U.S. Geological Survey Earthquake Information
Map of California's recent earthquakes
Ground motion maps of recent earthquakes
Seismo-links Exhaustive link list!

| U.S. Geological Survey Pasadena Office of Earthquake Information |
| Joshua Tree earthquake home | Joshua Tree National Park home |


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