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27 August 2011
Animated GIF of Virginia quake aftershocks
So last Tuesday we had an earthquake, and we expected some aftershocks as the crust in the Mineral, Virginia, area adjusted to the new stress regime. We expected those aftershocks to be lesser in magnitude, and to take place after the main shock. In other words, we would predict the following: And, indeed, over the past several days, that’s actually what happened:
Friday fold addendum
Lee Allison, State Geologist of Arizona and exemplar of public outreach via blogging, sent me an e-mail yesterday regarding that awesome coastal Greenland shot by Alistair Knock that I featured as the Friday fold. Lee, like many of you, found the image entrancing and intriguing, and as he explored the unannotated version, he made some discoveries. In this e-mail, Lee pointed out a few more faults that I hadn’t noticed. …
Why those curves, Rock Creek?
On Tuesday morning, before the earthquake hit, I answered an e-mail about DC faults. I get unsolicited e-mails all the time (and occasionally phone calls, too). The contact comes from people who have a geological question, find my blog, and figure that I might be willing to answer it for them, or to direct them to someone more knowledgeable. Sometimes they ask me to identify a rock. I see answering …