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Rhyolite Porphyry from Majuba Hill III

GSN field trip Day 2: We've taken a few Majuba Hill samples out of the bag. We'll now take a look at the farthest right sample, having already seen Rocks #1 & #2 and Rock #3. One side shows a weathered surface, with dark brown iron oxides and the copper carbonates malachite and azurite. Show More Summary

Asteroids named after two ASU professors

Asteroids have been named after two ASU professors, Phil Christensen and Dave Williams. The two planetary geologists, both faculty members in ASU’s School of Earth and Space Exploration.Nikki Cassis at ASU reports that Asteroid (10461) Dawilliams was discovered on December 6, 1978, by E. Show More Summary

Seismogram of Napa 6.0 Magnitude Earthquake from Modesto

One of the nice things about the new Science Community Center at Modesto Junior College is that we have been given some wonderful tools for the teaching of science. We had a modest seismometer at the old facility, but the software ran off Windows 97, and had not been updated since. Show More Summary

Kilometer-long crack opens in Hermosillo - an earth fissure?

A kilometer-long fissure opened up along Mexican Highway 4 between Hermosillo and the Gulf of California coast recently. Hermosillo Desde el Cielo flew a drone along the fissure capturing excellent video of the 8-m deep feature.The local newspaper is reporting that farmers had built levees to collect rainwater. Show More Summary

Magnitude 6.0 Quake in Northern California - Largest Bay Area Quake in 25 Years

Source: Northern California woke up this morning to the largest Bay Area earthquake since the 1989 Loma Prieta Earthquake (magnitude 6.9). The magnitude 6.0 quake, now being called the South Napa Earthquake, was located 6 miles (9 km) SSW of the wine country town of Napa at a depth of 6.6 miles (10.7 km). Show More Summary

Northern Convergence: The Day We Actually Had on Vancouver Island...and Goldstream

A plan is such a wonderful thing! With a plan, one can conduct field trips smoothly, with no delays, no missed stops, no problems. Oh, did I say plan? I meant to say "luck". I've been having fun with my recent posts, talking about the places on Vancouver Island that we intended to visit on our recent field studies course, but which we had to miss. Show More Summary

Mountain roads

Walking up Mountain Boulevard in the Laundry Canyon area takes you through one of Oakland’s old mining and timber districts. (Laundry Canyon proper is under the Warren Freeway.) First there’s the pyrite mine that I mentioned in the previous post. Then, looking up Bermuda Avenue toward the hills, you’ll spot a tempting area of exposed […]

Northern Convergence: Vancouver Island, the last of the plan that was...

Our tour of Vancouver Island in British Columbia continued. I've spent several posts (here, here, and here) describing places we saw when we scouted the island a few days before the arrival of our students, and they were really fine places to learn geology. Show More Summary

Has the puzzle of rapid climate change in the last ice age been solved?

The cold period of the last ice age was repeatedly interrupted by much warmer climate conditions. Scientists have long attempted to find out why these drastic temperature jumps of up to ten degrees took place within just a few decades. Show More Summary

Ho hum, another M3.1 Duncan aftershock

Northern Convergence: Vancouver Island, the Plan That Was, Part III

Road construction at Malahat Summit. Photo by Mrs. Geotripper. Continuing my brief series of things my students didn't see on Vancouver Island during our Northern Convergence tour of Canada, we reach a place my students did in fact "see", as in we were there and looking around, but the students didn't see what we saw. Show More Summary

Rhyolite Porphyry from Majuba Hill II

GSN field trip Day 2: we're still at Majuba Hill. Continuing with our progression from left to right of rhyolite porphyry hand samples, we move on to Rock Number 3, a weakly mineralized version of the tourmalinized porphyry. (Rock 1Show More Summary

Northern Convergence: Vancouver Island, the Plan That Was, Part II

Ah, the lost opportunities! I don't want to make it sound like we had a bad Northern Convergence trip; we actually had a great time taking our students through an exploration of the geology of Vancouver Island, but the trip we made was different than the one we planned. Show More Summary

Gorges are eradicated by downstream sweep erosion

A fast new mechanism drives the process of fluvial erosion.

Record number of downloads of AZGS maps and publications

The AZGS’s online document repository delivered more than 27,500 downloads of geologic maps, open-file reports, bulletins, bulletins, circulars and special papers, all in PDF format, during the fiscal year that ended July 31. The Document Repository is available free, online at Show More Summary

Northern Convergence: Vancouver Island, the Plan That Was...Part I

Our Northern Convergence tour continues. Our first full day in Canada was to be an exploration of geological sites on south Vancouver Island between Victoria and the ferry port at Nanaimo. There was lots of research, and Mrs. Geotripper and I headed out to the island a few days before our students met us in Seattle. Show More Summary

ADWR land subsidence report released

The Arizona Dept. of Water Resources has released its second report on statewide monitoring of land subsidence. "Land Subsidence Monitoring Report 2" is online for free viewing and downloading. [Right, index maps of active land subsidence...Show More Summary

M3.1 aftershock from Duncan quake

A magnitude 3.1 earthquake occurred at 9:13 pm on Friday evening, in the aftershock area of the M5.2 Duncan earthquake. [Right, orange star marks epicenter. Credit USGS]The main shock was on June 28 and aftershocks are continuing intermittently, with the largest being M4.1.

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