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Water-related issues facing the new governor and legislature

The current issue of the Arizona Hydrological Society carries an editorial by Alan Dulaney outlining some of the challenges related to water facing the new governor and legislature when they take office in January. As usual, Alan doesn't pull any punches: The election season is over. Show More Summary

Resolution Copper land swap passes U.S. House

The U.S. House of Representatives passed the National Defense Authorization Act, which includes a package of lands bills, among them the Southeast Arizona Land Exchange and Conservation Act. The latter involves transfer of about 2,400...Show More Summary

UW team explores large, restless volcanic field in Chile

For seven years, an area larger than the city of Madison has been rising by 10 inches per year. That rapid rise provides a major scientific opportunity: to explore a mega-volcano before it erupts. That effort, and the hazard posed by the restless magma reservoir beneath Laguna del Maule, are described in a major research article in the December issue of GSA Today.

If These Cliffs Could Talk: The Legend of Kos-su-kah, Tee-hee-nay, and Hum-mo in the Valley of the Ah-wah-nee

I've done a lot of traveling in the last month, from Arizona and back, to Pinnacles National Park, and then through Northern California to the Oregon Coast. In the blogging sense, I got distracted from a little mini-blog-series I was...Show More Summary

A Scarred and Beaten Ecosystem Persists: The Native Species of the Great Valley

I live in an extraordinary place! In my last post on the Great Valley I was discussing our use and abuse of our most precious resource, one of the richest soils on the planet. Some 95% of the original ecosystem has been manipulated by humans to achieve the highest biomass production possible. Show More Summary

Asteroid impacts on Earth make structurally bizarre diamonds

Arizona State University scientists have settled a longstanding controversy over a purported rare form of diamond called lonsdaleite -- a type of diamond formed by impact shock, but which lacks the three-dimensional regularity of ordinary diamond.

M2.9 aftershock to Duncan earthquake

One of the larger aftershocks in weeks, at magnitude 2.9, hit the Duncan area on Wednesday at 3:53 p.m. The magnitude 5.3 Duncan earthquake occurred on June 28 and since then hundreds of aftershocks have been recorded, with a score or so of them having been felt by local and regional residents. [Right, orange star marks epicenter of aftershock. Credit, USGS]

Links: Lamoille Canyon Geology

Geologic Map of the Ruby Mountains, Nevada - USGS Map I-1136 (Howard, Kistler, Snoke, and Willden, 1979)Geologic Map of the Lamoille Quadrangle, Elko County, Nevada - NBMG Map 125 (Howard, 2000)Geology of the Lamoille Quadrangle, Elko...Show More Summary

A Truly Great Valley: Ruminations on California's Most Valuable Resource

What is the most valuable mineral commodity in California, the so-called Golden State? Gold? Not hardly. We produced somewhere around 150 million ounces of the stuff over the last 160 years, netting riches for a few, and producing aShow More Summary

Map of aftershocks to Sunday's M4.7Oak Creek earthquake

AZGS geologist Jeri Young has compiled all of the aftershocks greater than magnitude 2.0 from Sunday night's magnitude 4.7 earthquake in the Oak Creek Canyon area between Sedona and Flagstaff.The figure also shows the M=3.5 quake from November 25 in the same area.

Himalaya tectonic dam with a discharge

The geologic history of the famous Tsangpo Gorge, in the eastern Himalaya, now needs to be rewritten.

Lenticular Clouds on Cascades Volcanoes, Part II (still no alien landings noted)

Volcanoes are endlessly fascinating for so many reasons, not the least of which is the way they make their own weather. Mt. Shasta, at the south end of the Cascades Range is no exception, as it rises around 10,000 feet above the surrounding valleys. Show More Summary

Magnitude 4.7 earthquake rocks Sedona-Flagstaff area

AZGS released the following statement this afternoon:A magnitude (M) 4.7 earthquake shook Sedona and Flagstaff in Sunday evening. The event occurred at 10:57 p.m. about 7 miles north of Sedona, near Munds Park.The earthquake and smaller aftershocks are shallow, with depths estimated at 1.3 miles. Show More Summary

Moderate quake (M=4.7) between Sedona and Flagstaff

A magnitude 4.7 earthquake struck north of Sedona on Sunday night at 11:57 p.m. local time and was widely reported by residents across the region. One small rockfall was reported on highway 89A but it was quickly cleared by ADOT. [Right top, AZGS Hazards Viewer shows active faults and historical earthquakes. Show More Summary

Road Song: I Can't Drive 55

Sammy Hagar: I Can't Drive 55 (lyrics)Album: VOA, 1984MOH turned me on to this song just yesterday (I didn't listen to much besides classic rock and country in the 80s). The song refers to the National Maximum Speed Law (part of the Emergency Highway Energy Conservation Act) enacted in 1974 in the wake of the 1973 oil crisis. Show More Summary

Lenticular Clouds and Cascades Volcanoes (no UFOs today...)

We have Mrs. Geotripper to thank for today's picture. We've been on the road in Oregon and as we came over the hill into Medford at sunset, we were greeted with the extraordinary sight of a lenticular cloud settling over Mt. McLoughlin in the southern Cascades Range. Show More Summary

Geosciences role in making Tucson the "Science City"

The University of Arizona's 28-page supplement in Sunday's Arizona Daily Star newspaper is one of the many high-profile activities taken by the school to build Tucson's reputation as "Science City." This now annual feature showcasesShow More Summary

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