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M3.5 quake near Sedona is felt locally; preceded by foreshocks

Residents in the Sedona-Flagstaff area report feeling a magnitude 3.5 earthquake that hit about 6 miles north-northeast of Sedona at 2:19 a.m. local time this morning. [Right, orange star marks epicenter. Credit, USGS]Dr. Jeri Young,...Show More Summary

Fog Returns to the Great Valley! I hate it, but it's a good thing (tentatively)

Buffalo has apocalyptic lake-effect snow, Minnesota has blizzards, Phoenix has horrific dust storms, Kansas has tornadoes, New Orleans has hurricanes. In the big picture, those of us who live in the Great Valley of California don't have much in the way of weather issues. Show More Summary

P.K. (Rana) Medhi

The Arizona Geological Society reports that "Long-time AGS member P. K. (Rana) Medhi [photo credit, AGS] passed away Nov. 7, 2014 at his home in Casa Grande. Medhi, former chairman of the Board of Governors of the Arizona Dept. of Mines...Show More Summary

Volcano hazards and the role of westerly wind bursts in El Ni?o

Volcano hazards and the role of westerly wind bursts in El Ni?o are topics published this week by the American Geophysical Union's journals.

Oakland City Hall: Stone and structure

A few weeks ago I set foot inside our City Hall—for the first time, I’m embarrassed to say. I hope you will step inside before you’ve lived here 25 years, like me. I’ve always known we have a gorgeous building, and now I’m amazed. C’mon in. First we’ll have a look at the structure’s famous […]

More Dust Devils

I often have occasion to see dust devils while traveling through Nevada, especially in the dryer months, but any time of year can afford the right conditions: a dry playa or dirt road (and other surfaces, read more here) and thermally unstable air. Show More Summary

Aftershock felt in Duncan area

Local residents reported feeling an aftershock to the Duncan earthquake on at 7:38 a.m. on Friday, Nov. 21. The USGS posted the location for the event today, with a magnitude of 2.8. This is the first aftershock felt in the area for many weeks. Show More Summary

Some plants regenerate by duplicating their DNA

When munched by grazing animals -- or mauled by scientists in the lab -- some herbaceous plants overcompensate -- producing more plant matter and becoming more fertile than they otherwise would. Scientists say they now know how these plants accomplish this feat of regeneration.

Good vibrations give electrons excitations that rock an insulator to go metallic

A team led by the Department of Energy's Oak Ridge National Laboratory has made an important advancement in understanding a classic transition-metal oxide, vanadium dioxide, by quantifying the thermodynamic forces driving the transformation. The results are published in the Nov. 10 advance online issue of Nature.

Re-learning how to read a genome

There are roughly 20,000 genes and thousands of other regulatory 'elements' stored within our DNA. Somehow all of this coded information needs to be read and transcribed into messages that can be used by cells. New research has revealed...Show More Summary

Caves in the Coast Ranges? Really? And a National Park? A Peek at Pinnacles

Bear Gulch Cave at Pinnacles National Park California's Coast Ranges hide some real gems (literally: check out benitoite, for instance). One of my favorites is also the nation's newest national park: Pinnacles National Park. The park...Show More Summary

How did we miss this story about vampires in abandoned mines in Arizona?

Well, Arizona, it looks like we had a chance to rid Arizona of vampires in our abandoned mines, but we blew it. Joe Hart won re-election as State Mine Inspector a couple weeks back with over 1 million votes or 98.29% of the votes cast. Show More Summary

Grand Canyon North Rim quake

A magnitude 2.9 earthquake occurred shortly after noon today on the north side of Grand Canyon. The USGS placed the epicenter about 19 miles northwest of Grand Canyon Village, but Dr. Jeri Young who runs the Arizona Broadband Seismic Network here at AZGS, places it further northeast. Show More Summary

The San Juan Bautista Earthquakes as recorded at Modesto Junior College

We have a simple classroom seismometer installed on the third floor of our Science Community Center at Modesto Junior College. It nicely captured the two earthquakes from San Juan Bautista that took place last night just five minutes apart. Show More Summary

Worldwide retreat of glaciers confirmed in unprecedented detail

Taking their name from the old Scottish term glim, meaning a passing look or glance, in 1994 a team of scientists began developing a world-wide initiative to study glaciers using satellite data. Now 20 years later, the international GLIMS initiative observes the world's glaciers primarily using data from optical satellite instruments such as ASTER and Landsat.

4.2 Magnitude Earthquake near San Juan Bautista

What else are you going to call a restaurant situated right on the San Andreas? A 4.2 magnitude earthquake struck at 10:26 PM PST tonight about 3 miles south of the town of San Juan Bautista in the Coast Ranges of Central California (the official USGS report is here). Show More Summary

Investors keep sand operation running on Navajo Reservation

Preferred Sands is one of the largest providers of sand for oil and gas production in the country, and their Arizona plant has the company's largest reserves. According to a story in Reuters, "pr ivately held Preferred Sands produces and distributes frac sand and proppant materials used predominately in oil and gas shale drilling. Show More Summary

Resolution Copper shaft is deepest in North America

Shaft #10 at the Resolution Copper mine in Superior reached its final depth of 6,943 feet (2,116 m). It is the deepest single lift shaft in North America, according to the company. [Right, shaft #10. Photo credit, Nyal Niemuth]The Resolution...Show More Summary

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