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4 May 2021

Interesting sedimentary basin structures in fold-thrust belt outcrop patterns

By Philip S. Prince Fold-thrust belts developed in sedimentary rock sequences produce interesting and complex patterns on Earth’s surface. These patterns become even more complex and intriguing when the folded and faulted sedimentary layer sequence contains internal structures that pre-date thrust belt development. A particularly outstanding example of this effect is the Talar Syncline of the Makran fold-thrust belt, in which an extensional growth fault depocenter has been folded, uplifted, …

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15 October 2020

Normal fault, reverse fault, or both?

The new model, whose color scheme is admittedly quite shocking (think Pepto-Bismol bottle), is shown… The interesting fault is at the center of the image. The fault is traced in black in the lower image, with arrows indicating movement sense.

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28 July 2020

Fault-propagation folds in a sandbox model

New from The Geo Models: “These anticlines are recognizable as fault-propagation folds because the fault that offsets the deepest blue layer does not cut upward through the entire section. Displacement along the fault at depth is accommodated by folding of the overlying, un-faulted layers.”

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27 January 2017

Sleuthing the site of a century-old earthquake

The second-largest earthquake on the planet in 1904 happened somewhere in Alaska. It could have been St. Michael, Rampart, Fairbanks, Coldfoot or a place called Sunrise on the Kenai Peninsula. People felt the magnitude 7.3 at each place.

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18 August 2016

Studying Earthquakes from England

I’m back at it! This blog has suffered a long hiatus for which I could prattle on with a multitude of excuses, but suffice it to say that the shift from U.S. PhD student life to European postdoc life resulted in a pretty vast rearrangement of my day-to-day activities, priorities, schedule, and habits, and I’ve struggled to carve the time for all the things I’m still even more excited to …

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30 August 2014

Earthquake rupture through a U.S. suburb

In the quiet wee hours of a NorCal summer night, the ground lurched beneath the mud of the northern San Francisco Bay and sent seismic waves roaring upward and outward into the world-famous wine valley’s central city, Napa, CA. After they wreaked their havoc in Napa and nearby communities the seismic waves spread farther afield and gently rumbled most of the Bay Area and its exurbs from our weekend slumber. By the time …

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