Tag Archive for: earthquakes

A little read on the latest quake that shook 50-miles offshore of northern California late last night.


We all have our faults, and that includes planet Earth. Earthquakes, big and small, rattle the globe every day, most recently making news this week with temblors in northern California.


Would you be our Valentine? You geo friends really rock!

Bear River, Rich County, Utah
Photographer: Chris DuRoss; © 2011

This sand boil (eruption of liquefied sand) resulted from ground shaking during the 2010 magnitude 4.5 Randolph earthquake, which is one of the smallest earthquakes recorded to generate liquefaction. Bear River, Rich County.


A swarm, or cluster, of 24 earthquakes have been recorded Tuesday, the first about 37 miles west-northwest of St. George in Nevada, and the others within about a 10-mile radius of the first, see map inset. The earthquakes have ranged from local magnitude 4.1 at both 8:20 a.m. PST and 6:30 p.m. PST, and various lesser amounts throughout the day with the most recent registering local magnitude 3.2 at 6:38 p.m. PST.


And another great article on Utah quakes and other worldly shakes—
Nevada and Utah Earthquakes; Greece, Mid-Atlantic Tremors: January 2014

The world seemed to wake up this week, seismically speaking.



One of the biggest earthquakes in U.S. history didn’t occur in California. Or Alaska. It happened in the country’s midsection some 200 years ago in an area where today seven states straddle the Mississippi River Valley.



We all have our faults, and that includes planet Earth. Earthquakes rattle the globe every day, big and small, most recently making news this week with temblors in Puerto Rico and southern California.



On Maine’s rugged coast, just north of the tourist town of Boothbay, an underground seismometer is listening for earthquakes. Engineers activated it on 26 September, completing the US$90-million Transportable Array, an ambitious effort to blanket the contiguous United States with a moveable grid of seismic monitors (see ‘On the march’).



Scientists have discovered evidence of four big earthquakes that rocked the Salt Lake Valley long before pioneers arrived — and they’re not on the well-known Wasatch Fault on the East Bench.

Geologists are getting their first good look at the West Valley Fault zone, just west of the Salt Lake International Airport. They’ve wanted to dig trenches in the area for years.

“We suspected that there had been numerous earthquakes in this region,” said Chris DuRoss of the Utah Geological Survey.

The West Valley Fault zone is actually comprised of a dozen different fractures. They lie roughly between Redwood Road and 5600 West from about 1700 North to 4800 South. But since at least the 1980s the area on the margins of the Great Salt Lake has been too soggy to dig.

Over the last decade the shrinking lake receded several miles from the fault zone, and the water table has dropped. Now that the Utah Geological Survey has been able to dig three trenches, the water table is visible 10 feet below the surface.

Recently geologists had their first look underground, and it confirms their suspicions. The horizontal layers of sediment show clear signs of being broken by fault movements. It’s clear evidence of four big earthquakes in the last 15,000 years.



Fox 13

A Utah geologist was recognized for keeping Utahns safe. Geologist William Lund ate, slept, and studied fault lines and earthquakes for a number of years for the Utah Geological Survey, which has studied and investigated geologic hazards in Utah for more than 40 years. “I’m very honored and surprised, I had no idea, but it’s truly an honor and I’m happy,” Lund said.

Lund said he has spent a good part of his career trying to characterize past big earthquakes and figure out what might happen in the future.