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HayWired, an imaginary earthquake coming in 2018

Earthquakes are always a surprise, but we can be ready for them. Or, more ready. We can practice on a household basis, whether it’s a simple “Drop, Cover, Hold On” drill or a series of family meetings to go over scenarios — what if Mom’s stuck at work? What if we’re all out of town? […]

Global Tectonics and Marine Animal Diversity

Arizona Geological Society - 11 July 2017. The Society's July's dinner meeting hosts speaker Dr. Andrew Zaffos, Arizona Geological Survey (AZGS), discussing the role of global tectonics on marine animal diversity. Andrew joined AZGS in June 2017 to replace Steve Richard (retired Dec. Show More Summary

Following a trail of galena and cerussite mineral flakes to track Zuni and Pueblo potters from AD 1275 - AD 1670

Southwestern North America (D. Rumsey Collection) “ I am an archaeologist who uses lead isotope analysis to source the ores used to make glaze paints on pre-contact and early historic Pueblo glaze painted pottery.”, was the introductory...Show More Summary

Liesegang Banding: Automatic Art

Nature is a marvelous painter. --

Born in Catastrophe: Silver Lake

A serene little Pacific Northwest lake has a violent origin. -- Read more on

Touting the contribution of geoscience to the Arizona economy

Page 1 of 2 page Geoscience and Arizona. How do you quantify the impact of geology and the geoscience community on the health and vigor of a state’s economy? That’s no small task, but the American Geosciences Institute, an umbrella organization...Show More Summary

Sweeping Sands

Let's visit some dunes I have known - including some frozen in time. -- Read more on

Permanent Impermanence, or How the Fudge Did That Fossilize?

Imagine the weather turning to stone... --

Oakland building stones: Serpentinite

In a modest West Oakland neighborhood on Market Street is the modest West Grand Shopping Center. Its ordinary building is clad in rough stone, an exterior treatment similar to the Kaiser Building and many other examples. But at the West Grand Shopping Center, the cladding consists of fist-sized pieces of beautiful serpentine rock. The front […]

Revisiting interactive geochemical & mineralogic maps for soils of U.S.

Copper in soil at 0-5 cm depth From 2007 to 2010, the U.S. Geological Survey collected soil samples from 4,857 sites throughout the conterminous United States to support the North American Soil Geochemical Landscapes Project. Hematite...Show More Summary

Building a statewide inventory of landslides in Arizona

Landslide data included in AzSLID AZGS's ' Building a Statewide Inventory of Landslides in Arizona' is now available on line courtesy of the North American Symposium on Landslides and AEG. More Summary

High Water Across the West: Rye Patch Dam and the Humboldt Sink

Rye Patch Dam on April 19th. The water in Rye Patch Reservoir is high, but not at the high water mark that can be seen just past the spillway. I'm moving slowly on this mini-series about the Humboldt River while working essentially 12-hour...Show More Summary

Brooklyn Landing, Brooklyn Creek

The first Western inhabitants of this area, the Peralta family, were horse people rather than boat people. They did much of their business, with the mission and the town of San Jose in the South Bay, by land. When they did use boats, it was to transport hides and tallow from their ranch, using an […]

Hitting the Road in the Best Way: Into the Pacific Northwest, and With My Students!

2 months agoAcademics / Geology : Geotripper

It's the time of year I love the most, our field season, when my students and I hit the road. We are making a grand loop, heading north along the spine of the Cascades, with stops at Mt. Shasta, Lava Beds, Crater Lake (above), St. Helens, and Mt. Show More Summary

Oakland builders, what are you thinking?

Californians have always known we’re prone to earthquakes. The first Californians didn’t have our worries about it, though, because their structures were small and limber, no larger than a temescal sweathouse. Things changed when the missionaries of New Spain came into the country starting in the late 1700s. When the earthquake of 8 December 1812 […]

Volcanoes in Hawai'i: Rock Finds a Way (to destroy life)

2 months agoAcademics / Geology : Geotripper

The summit of Mauna Kea in the distance, and the forested lower slopes of Mauna Loa in the foreground My last entry on the geological drama of Hawai'i concerned the stubbornness of life in a harsh volcanic environment, such as that which is found on the highest slopes of Mauna Loa and Mauna Kea on the Big Island of Hawai'i. Show More Summary

Liveblogging the Deluge: Before and Almost After

2 months agoAcademics / Geology : Geotripper

Tuolumne River on Feb. 21, 2017, discharge about 16,000 cubic feet per second There is no doubt that this has been a unique year for the rivers of California, one that could very well not be repeated in many of our lifetimes. A year ago we were in the grips of the worst drought ever recorded, five years running, and then the rains began. Show More Summary

Volcanic Flows in Hawai'i: Life Finds a Way (to destroy rocks)

2 months agoAcademics / Geology : Geotripper

Ohi'a Lehua (Metrosideros polymorpha) clinging to a crack in a 1974 lava flow on Kilauea I had kind of a schizophrenic (split-brain) response in regards to what I wanted to accomplish with this post. A couple of weeks ago while still...Show More Summary

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