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13 October 2011

Superior Craton trip, stop 1

The first stop on our pre-GSA field trip to the subprovince boundaries of the Superior Craton was a place just north of Virginia, Minnesota, where the Mesabi Iron Ranges are mined (same Proterozoic banded iron formations that were portrayed as the backdrop of the mining activity depicted in the film North Country). The pull-off is locally known (to geologists) as “Confusion Hill,” but marked on the roadside sign as the …


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30 August 2011

Updated aftershock plot

The USGS reports more aftershocks, so your humble graphing servant has responded with a plot that updates the images I showed you last week. Here you go: Embiggable, via a simple click. Again, the “decay” pattern jumps out at us. One thing that I’m also noticing is how there are no events below 2.0 magnitude. What’s up with that? Simply not detectable? …or not worth bothering with? By the way, …


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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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6 June 2010


Heat-stressed map of the Chesapeake Bay / Washington, DC region, as seen at Kenilworth Aquatic Gardens. Looks like mudcracks, eh? Similar stresses; similar strains.


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2 June 2010

1453, by Roger Crowley

So,  I think I dropped a hint here that I was planning to travel to Turkey this summer. Lily and I will be there from the end of June until the middle of July. (And I’ll be going back in October for the Tectonic Crossroads conference.) In preparation for a trip like this, I enjoy doing some research and reading some books. There are a lot of books about Turkey, …


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25 May 2010

Vector maps by Eric Fischer

“The Geotaggers’ World Atlas #8: Washington, DC” by Eric Fischer If you like maps, you should go check out these images by photographer Eric Fischer. (via here) The different colors represent different modes of transportation: Black is walking (less than 7mph), red is bicycling or equivalent speed (less than 19mph), blue is motor vehicles on normal roads (less than 43mph); green is freeways or rapid transit.


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11 May 2010

Lola and the maps

My cat Lola has a thing for big sheets of paper, particularly maps. Here she is this morning, “helping” me plan a summer trip to Turkey:


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7 March 2010

Where I am today

Graphics by USGS, after Schuberth, 1967.


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