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15 December 2017

Aerial Geology, by Mary Caperton Morton

There’s a lovely new coffee table book out, just in time for holiday shopping. My fellow EARTH magazine contributor Mary Capterton Morton is the author of Aerial Geology, a beautiful massive tome that profiles a hundred geologically interesting locations across the North American continent. Mary was kind enough to forward me a copy for review, and I was delighted to flip through its gorgeous pages. It’s a visual feast, with …


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22 November 2016

We are in unprecedented territory with global sea ice

The amount of sea ice on planet Earth is much, much lower than ever recorded at this time of year. Will this anomaly turn out to be a relatively minor “weather” event? Or is this what a sea ice tipping point looks like?


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17 January 2015

Geology of the Acropolis (Athens, Greece)

When visiting Athens, Greece, you are drawn to the Parthenon’s grand architecture atop the hill called the Acropolis. But why is the Acropolis a hill?


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27 March 2014

Aden Crater

That’s Aden Crater, a Pleistocene shield volcano in southern New Mexico. Here’s what it looks like from above (Google Maps view): I also noted the position of two nearby maar craters: Kilbourne and Hunt Holes. When you climb up to the edge of Aden and look in, you see the congealed and fractured remnants of a lava lake that once filled this to the brim (and indeed, spilled over the …


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7 December 2012

Friday fold: Pakistani Perplexity

In last week’s Friday fold, I featured this image… …which prompted commenter Lynn David to ask, What’s going on to the west side of that red/green rock cored syncline in #2? It looks like some sort of disconformity but then I looked closer (and man, does that rock redden up) and it appears that the synclinal axis suddenly gets smashed up against “something” – possibly a fault of a different …


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30 November 2012

Friday folds: Google Earth screenshots

Found these lovely places over the past few weeks while searching (unsuccessfully) for Where On (Google) Earth? scenes… Click on any of them to make them bigger.


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10 October 2012

Wo(G)E #357

Callan hosts the 357th installment of the popular satellite imagery / geologic search game “Where on (Google) Earth?”


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16 May 2012

Contemplating the IARC-JAXA graph

One of the ~350 or so blogs I subscribe to is Arctic Sea Ice by Neven. Today, he put up a post highlighting new daily data from IARC-JAXA, a collaboration between the International Arctic Research Center (IARC) at the University of Alaska-Fairbanks and the Japan Aerospace Exploration Agency (JAXA).  Check it out. Here’s a couple of things I was struck by: The annual variation between summer and winter ice cover …


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13 April 2012

Friday folds: Turpan Depression

Rob Simmon of NASA’s Earth Observatory is the source for today’s Friday folds. Last week, he tweeted this image to me: That’s a excellent example of the outcrop pattern of a more or less horizontal outcrop of folded rock. To the north is a synform (notice that where streams have eroded it, the bull’s-eye pattern takes a notch inward toward the center of the structure), and to the south, a …


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15 March 2011

New GPS vectors

Just wanted to call your attention to two new maps showing GPS displacement vectors from Japan. (Barry left links to these images in a comment yesterday.) These images are hosted on the website of the Geospatial Information Authority of Japan, and though I can’t read the Japanese to verify their authorship, I presume that agency produced them as well. They are easier to read than the one I posted on …


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