Tag Archive for: rock-fall

Utah Geological Survey

SURVEY NOTES volume 41, number 3

snt41-3GEOLOGIC HAZARDS IN UTAH

This issue contains:

    New Geologic Hazards Mapping in Utah

*Landslide Inventory Mapping in Twelvemile
Canyon, Central Utah
*Second Damaging Y Mountain Rock Fall in
Four Years
*Large Rock Fall Closes Highway Near
Cedar City, Utah
*Logan Landslide
*Teacher’s Corner
*GeoSights: Utah’s belly button, Upheaval Dome
*Glad You Asked: What should you do if you find a fossil?
Can you keep it? Should you report it?
*Energy News: Carbon Dioxide Sequestration Demonstration
Project Underway in Utah!
*Survey News
*New Publications

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Utah Geological Survey

PUBLIC INFORMATION SERIES 94

pi-94

ROCK-FALL HAZARDS IN UTAH
Jessica Castleton

Rock falls pose a hazard in Utah because we live, work, and recreate in close proximity to mountains and mesas. Large rock fragments and boulders accelerate rapidly when dislodged from cliffs and hillsides and can cause significant damage to homes, property, roadways, and vehicles, as well as loss of life. Recent damaging rock falls in Utah highlight the importance of recognizing this hazard. This 4-page, full color brochure provides more information on the rock fall hazard in Utah, including causes of rock falls, how to recognize the hazard, and what you can do to reduce potential rock fall damage.

4 p. (2 sided) brochure

PI-94……….free

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Utah Geological Survey

Rock Fall in Provo, April 11, 2009

rock-fall-2009Around 11:30 a.m. on April 11, 2009, a rock fall impacted the area of 1500 North and 1550 East in Provo, Utah.

One rock-fall boulder damaged the outside of a playhouse located at 1522 North 1550 East, and another, larger boulder severely damaged a vacant house at 1496 North 1550 East.

The April 11, 2009 rock fall occurred one lot north of the May 12, 2005 “Y” Mountain rock fall.

The rock fall occurred shortly after a storm on April 8-9 that dropped 1.5 inches of precipitation in less than 18 hours at the Cascade Mountain Snotel site, 3 miles southeast of the rock-fall source area.

Impact craters (bounce marks) evident on the slope above the houses indicate several rocks traveled downslope. The rocks traveled an estimated one mile downslope, and likely achieved high velocities as they bounced and rolled.

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Related Links

2005 Provo Rock Fall

Rock-Fall hazards