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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.

Mine creek at Twitter Court

I’ve shown you the ugly orange streambed just below the old McDonell pyrite mine. Farther downstream, the creek (which I’ll name Mine creek) emerges from private backyards next to Mountain Boulevard at Twitter Court. It’s still pretty orange here, from extremely small (colloidal) particles of iron oxide minerals that form as the acid drainage from […]

Exfoliation in action in Twain Harte

Okay, so this is different. I've never seen exfoliation actually happen. I've seen distant rockfalls that might have been initiated by exfoliation, but this is pretty wild. Twain Harte is the Sierra Nevada village where there were dam failure worries a few weeks ago, probably related to exfoliation. It was posted by Dotysan on YouTube. Good job!

Northern Convergence: Victoria, Finding Geology and a Rare Ecosystem in a Beautiful City

We start our blog journey through Canada with a view of alpine peaks, forests and birds. If the picture seems a little fuzzy, it's because it is a highly cropped view down one of the main avenues in the city of Victoria on Vancouver Island (below). Show More Summary

A new look at what's in 'fracking' fluids raises red flags

As the oil and gas drilling technique called hydraulic fracturing proliferates, a new study on the contents of the fluids used raises concerns over several ingredients. The scientists presenting the work today at the 248th National Meeting...Show More Summary

New tools reveal mysteries of an ancient Arctic terrane

The evolution and origin of Earth's Arctic realm and the nature, location, and age of its major tectonic boundaries remain subjects of considerable uncertainty. This new compilation of studies from The Geological Society of America demonstrates...Show More Summary

Afterschocks continue from Duncan earthquake

The Duncan area of eastern Arizona had another measurable aftershock early this morning, following the June 28, M5.2 event. A M2.8 quake occurred at 3:33 am local time close to other recent aftershocks. We expect aftershocks to continue for weeks and possibly months. [Right, orange star marks epicenter. Credit, USGS]

Northern Convergence: America's Pompei and Sailing to Canada

The first day of our journey through western Canada and the Pacific Northwest continued... Source: Wikipedia On this lonely beach on the far northwest corner of the Contiguous United States a village once stood. It was home to some of the Makah people who still live in the region today at Neah Bay. Show More Summary

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