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Sea-level spikes, volcanic risk, volcanos cause drought

Unforeseen, short-term increases in sea level caused by strong winds, pressure changes and fluctuating ocean currents can cause more damage to beaches on the East Coast over the course of a year than a powerful hurricane making landfall, according to a new study.

Bill Dresher, first State Geologist of Arizona

We learned late today that Dr. William H. Dresher passed away on August 9. Bill was named the Dean of the College of Mines and Director of the Arizona Bureau of Mines at the University of Arizona in 1971, and became the first person to hold the title of “State Geologist." He served as Director and State Geologist until 1981. Show More Summary

Rhyolite Porphyry from Majuba Hill I

I'm just now getting back to my Majuba Hill series, wherein I'm posting some photos from the spring GSN field trip and some related rock photos. And for those just catching up, the series begins loosely with this first unplanned stop. Show More Summary

Burrowing animals may have been key to stabilizing Earth's oxygen

Evolution of the first burrowing animals may have played a major role in stabilizing the Earth's oxygen reservoir, according to a new study in Nature Geoscience.

Having Fun With the SUPERMOON....

So let's face it. SUPERMOON really is overblown. Yes, the moon is closer to Earth, but it does this five times this year. Being closer, it is 14% larger in size, and 30% in brightness than when it is farther away. So, nothing unusual, really. Show More Summary

Northern Convergence: The Olympics, Where a Trench Became Sky-Piercing Peaks

Our journey through Western Canada and the Pacific Northwest began as we met with our students in the Seattle area one evening in late July. After a complicated couple of hours of meetings and negotiating van rentals (reservations three months earlier are only the preliminaries), we settled in for the night, and prepared to hit the road at 6:30 AM. Show More Summary

M 3.0 aftershock from Duncan earthquake

We experienced another aftershock to the June 28, M5.2 Duncan earthquake, with a magnitude 3.0 event at 9:39 pm local time Saturday night. [Right, orange star marks epicenter. Credit, USGS]Smaller aftershocks continue to be recorded by the AZGS seismic network but not reported by the USGS.

Local boulders in the Calaveras triangle

Where the Warren Freeway ends in its merge into I-580, most people drive south onto 580 east. The handful of locals or lost drivers who instead take the last exit to get onto 580 west will go through perhaps 580’s most deserted interchange. That’s where the highway builders installed this humble triangle, splitting the freeway […]

HudBay plans new drilling for Rosemont copper deposit

Officials of HudBay Minerals, new owner of Augusta Resources, which is the parent company to Rosemont Copper, were introduced today at the Arizona Mining Alliance monthly luncheon meeting in Tucson. Nearly 150 attendees from the regional mining and business communities were present. Show More Summary

Northern Convergence: A Confusion of Orogens, Belts, and Terranes

The first thing to remember about Canada as we start our geological journey is that it is big. Really, really big. It's larger than the United States (including Alaska). And there are fewer people living there than live in California. Show More Summary

Grand Canyon is theme of national Geologic Map Day

The annual Earth Science Week celebration is October 12 – 18 this year, with Friday, October 17 being Geologic Map Day. The theme this year is “Earth’s Connected Systems.” We just learned that the Geologic Map Day team chose the Grand Canyon as the poster for this year. So, here is a sneak peak of that poster.

Scientists warn time to stop drilling in the dark

The co-authors of a new study, including two Simon Fraser University research associates, cite new reasons why scientists, industry representatives and policymakers must collaborate closely on minimizing damage to the natural world from shale gas development. Show More Summary

Northern Convergence: A Geological Journey Through Canada and the Pacific Northwest

Some of the world's most dramatic landscapes exist within the strip of the North American continent between the High Plains of Canada and Montana and the Pacific Coast. The geologists call it the Western Cordillera, part of the mountain...Show More Summary

Whither Go the Redwoods? Smoke in the Temperate Rainforest

Our long journey through western Canada and the Pacific Northwest ended a few days ago, but we lingered in Oregon and Northern California for a few days to visit family, and frankly, to avoid the heat wave that seemed to engulf the southwest and interior valleys. Show More Summary

Four earthquakes east of Kingman

We have now recorded signals from four earthquakes last night, east of Kingman, ranging in magnitude from M2.0 to M3.1: M 3.0 at 8:35 pm local time M 2.0 at 9:55 pm local time M 3.1 at 11:57 pm local time M 2.7 at 12:19 am local time The epicenters are about 25-30 miles east of Kingman, and north of highway I-40 Dr. Show More Summary

Multiple quakes near Kingman?

The USGS reports a M3.0 earthquake at 8:35 pm last night, about 22 miles (36 km) east of Kingman, Arizona. [Right, orange star marks epicenter. Red lines are active faults. Credit, USGS]However, the Kingman seismic monitoring station...Show More Summary

Reaching One Thousand

So, while I wasn't thinking about it, my 1000th post posted, and this is my 1005th! I'm not sure, really, what to say about this — although I'm also sure I'll think of something — other than Yay!!I didn't have a particular number ofShow More Summary

Reservoir Closed in Sierra Nevada Village Over Concerns of Possible Failure

National Weather Service A flash flood warning in the Sierra Nevada town of Twain Harte has been cancelled this evening after earlier concerns over a possible dam failure. Twain Harte Reservoir is a small (143 acre foot) dam that drains into Sullivan Creek and Don Pedro Dam. Show More Summary

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