Tag Archive for: hazards

The hypothetical family that a group of Highland men allegedly was trying to protect when they destroyed a rock structure was more likely to die on the drive to Goblin Valley State Park than to be crushed by a falling rock.




In Christchurch, New Zealand in February, 2011, a magnitude 6.3 earthquake struck six miles from the city center. The sandy type of soil present in the area caused the ground to basically liquefy during shaking.

UGS Geologist Chris DuRoss is interviewed by KCPW: Explore Utah Science to discuss the hazard of liquefaction we face right here in the the Salt Lake Valley.


Earthquake Risk in the Salt Lake Valley

Michael Hylland, a geologist at the Utah Geological Survey, examines disruptions in the subsurface soil at a trench dug through a section of the Wasatch Fault



It’s been a month since a massive rock slide sent boulders the size of trucks tumbling into and across Jones Hole Creek, and a thick layer of cream-colored sandstone dust still coats every surface.





An earthquake of local magnitude 2.7 occurred at 5:32 a.m., Tuesday, about 90 miles southeast of Cedar City in northern Arizona according to the U.S. Geological Survey website. The USGS also lists the quake at 3.0 magnitude because it uses a different rating system. A micro-earthquake of local magnitude 2.0 occurred last Wednesday 5 miles south of Hurricane; and another 2.0 occurred Sunday 13 miles north-northwest of Ivins.





If highway construction projects have taught commuters anything, it’s that even a single lane restriction can bring traffic to a crawl. Now imagine the impact on your commute because of a unexpected force of nature — like a strong earthquake, a blizzard, flooding rains or a tornado.

Along Utah’s Wasatch front, a fault spans 240 miles, and 80 percent of Utah residents live along its path.

The Utah Geological Survey notes the fault “has the dubious distinction of being one of the longest and most active normal faults in the world.”

Other areas of the country are also near fault lines. And along the Wasatch fault, several dozen freeway overpasses cross the main corridors near which the fault travels.

Other areas are more prone to conditions that tornadoes form in. And others live in the paths of hurricanes. Still, blizzards, fires and other storms can prompt evacuations or paralyze an area.




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



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.



Related Links

2005 Provo Rock Fall

Rock-Fall hazards