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Small quake northwest of Kingman

Most of our attention has been on southeastern Arizona where aftershocks continue from the June 28 magnitude 5.2 Duncan earthquake. But yesterday the opposite side of the state had a minor M 1.9 earthquake at1:13 p.m. local time, midway between Kingman and Boulder City.[Right, orange star marks epicenter. Credit, USGS]

The Road Goes Ever Ever On: Getting Into the Field Again!

Roads go ever ever on, Over rock and under tree, By caves where never sun has shone, By streams that never find the sea; Over snow by winter sown, And through the merry flowers of June, Over grass and over stone, And under mountains in the moon. Show More Summary

Earthquakes explained? New research shows friction and fracture are closely related

Overturning conventional wisdom dating back to da Vinci, Hebrew University of Jerusalem researchers found that fracture -- how things break -- and friction -- how things slide -- are closely related. In laboratory-produced earthquakes,...Show More Summary

"Supervolcano" Causes Road to Melt! Hmm, About That...

"Parts of Yellowstone National Park closed after Massive Supervolcano beneath it melts road!" screams the headline in a typical treatment of a modest story out of one of our nation's premier national parks. Let's take the fact that there...Show More Summary

It's a SUPERMOON, But Then Again, the Moon is Always Pretty Cool

The Moon has an elliptical orbit, which means that it is sometimes closer and sometimes farther away from the earth. Today the moon is full and making one of its closer approaches (perigee Moon), at 222,611 miles. At other times it can...Show More Summary

Out of the Desert and Back to the Green Hills of Home

Today wraps up the story of a week-long journey through the deserts of the southwest. I've been telling the story as if in real time, so it sounds like I'm just now arriving home, but actually we finished the trip just over a month ago. Show More Summary

Biggest aftershock yet from Duncan quake - M 4.1

A magnitude 4.1 aftershock last night at 7:48 p.m. local time, is the biggest since the main 5.2 Duncan earthquake struck on June 28. [Right, southern-most orange circle is the M 4.1 event. Credit, USGS]There was another M 3.0 aftershock at 12:53 a.m. Show More Summary

Map of largest aftershocks from the Duncan M 5.2 earthquake

We posted a map [right] this afternoon of all of the magnitude 3.0 and larger aftershocks from the June 28 magnitude 5.2 Duncan earthquake [shown in red]. Five of the 13 events have occurred in roughly the last 24 hours.The seismic stations...Show More Summary

Studying the Duncan M5.2 aftershocks: What can we learn?

The Arizona Geological Survey deployed 5 temporary seismic stations [Right. Photo credit, Jeri Young, AZGS] in the Duncan area of eastern Arizona to better monitor the aftershocks following the June 28th, M 5.2 earthquake.MonitoringShow More Summary

Duncan quake aftershock rocks Clifton

We are getting reports that another aftershock, M3.6,at 10:33 a.m. this morning shook buildings in Clifton, about 30 miles to the north-northwest.[Right, orange star marks latest aftershock to the June 28, M5.2 Duncan earthquake. Credit, USGS]

Duncan area hit by four larger aftershocks

The Duncan area experienced four more aftershocks in an 18 hour period [right. credit USGS], with local residents reporting feeling them. There was a M3.6 event at about 3 p.m. Thursday and a M3.2 at 11:15 p.m. A M2.8 occurred at 1:38 a.m. Show More Summary

My Home Town Takes Another Hit: The Parasites Strike Again

It gets discouraging sometimes. According to yet another report, Modesto is the worst place in the country, in this instance, the worst place to start a career. As usual, two California cities only a few miles apart, Modesto and Stockton, made the top five. Show More Summary

Temporary seismic stations capturing more aftershocks to Duncan earthquake

AZGS staff installed three more temporary seismometers yesterday, in the area around the M5.3 Duncan earthquake in eastern Arizona. This brings the number of temporary stations to five. AZGS geologists Jeri Young and Mike Conway observed half a dozen micro-quakes roll across the area just during lunch while they were installing the stations. Show More Summary

Ancient ocean currents may have changed pace and intensity of ice ages

Climate scientists have long tried to explain why ice-age cycles became longer and more intense some 900,000 years ago, switching from 41,000-year cycles to 100,000-year cycles.

Freeport may sell off Chile mine to focus on US investments

Phoenix-based Freeport McMoRan Copper & Gold is reportedly considering selling its huge Candelaria copper mine in Chile to help pay down corporate debt and refocus its efforts in the US, according to a story in the Wall Street Journal. Show More Summary

How to Hide a 14,000 Foot Peak in California? Make it Red, Call it White...

And then put a mountain right next to it that is actually white. Seriously.So, quick, what's the name of the third highest mountain in California? And for a bonus point, what is the name of the second highest? No, quicker than that,Show More Summary

Oklahoma quakes induced by wastewater injection, study finds

The dramatic increase in earthquakes in central Oklahoma since 2009 is likely attributable to subsurface wastewater injection at just a handful of disposal wells, finds a new study to be published in the journal Science on July 3, 2...

Aftershocks continue from Duncan M5.3 earthquake

Two aftershocks with magnitudes over 3.0 hit the Duncan area on Saturday, a week after the 5.3 main shock occurred.A magnitude 3.2 event hit at 12:30 pm, followed by a magnitude 3.5 shock at 9:24 pm. [Right, the top orange circle is the M3.2 aftershock, the leftmost orange circle is the M3.5 event. Show More Summary

The "Fingers" of Zion: Another Quiet Corner of a Crowded National Park

My last few posts have been about finding some quiet corners in one of our busier national parks, the one at Zion Canyon. Sometimes one finds solitude by following popular trails at less popular hours, or by following where the trams go (but not where they stop). Show More Summary

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