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Joshua Tree National Park- on shaky ground!
While this site is under construction, this page will act as an index to Joshua Tree National Park’s earthquake and geology web pages and resources. Please feel free to let us know what you think at the e-mail link below.

What’s Shaking in Joshua Tree?

Map showing
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!

spacer image 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.
spacer image 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.

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Site contents

What’s Shaking in Joshua Tree!
pebbleHector Mine earthquake
pebbleShaded Relief Map: Hector Mine earthquake (10/19/99)
- 130 MB image
pebbleAerial photos of Hector Mine earthquake rupture zone
pebbleHector Mine EQ ground-shaking intensity maps
pebbleHector Mine EQ damage reports and more
pebbleMap of seismograph network in the Joshua Tree region
pebbleSee a Hector Mine earthquake seismogram
pebbleMap showing recent Hector Mine earthquake activity

Links to other Earthquake Information
pebbleAll About Earthquakes
- Earthquake intensity
- Earthquake magnitude
- Faults
- Earthquake epicenter and focus
- See Sunset Crater’s seismograph
pebbleEarthquake ABC - for kids! For parents!
pebblePutting Down Roots in Earthquake Country

More Earthquake Links
pebbleU.S. Geological Survey Earthquake Information
pebbleMap of California’s recent earthquakes
pebbleGround motion maps of recent earthquakes
pebbleSeismo-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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| USGS Geology in the Parks home | NPS Park Geology Tour home |

This site is a cooperative endeavor of the
US Geological Survey Western Region Earth Surface Processes Team
and the National Park Service.
Please share your comments and suggestions with us!
This page was last updated on 10/19/99
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