#faulting

[hit-with-rock]

I will actually do all the geology write ups about my trips last summer eventually but here’s a reverse fault underground .

I’m a bad geologist for not putting a scale in but the fault zone is maybe a foot?

Probably wouldn’t be a great time if it reactivated while we were standing next to it but we’d learn something new!!

[relatetorocks]

[earthstory]

Food Faulting This is an example of a “structural geology experiment” done with basic kitchen ingredients. Flour, sugar, salt – different sized grains have different properties, and some (like flour) even stick together fairly rigidly.

This experiment was created by piling up several layers of different ingredients and then pulling them apart (by tugging on some sort of black layer seen at the bottom right that was originally buried at the bottom). As the layers were pulled apart, the upper layers collapsed downwards forming a series of faults and folds. This pattern of a single down-dropped block is called a “graben” and it occurs all over the world in settings where layered, sedimentary rocks are pulled apart. You could even do this in your own kitchen; however, I'm not cleaning up the sediments afterwards. -JBB Image credit: Gunnar Ries https://commons.wikimedia.org/wiki/User:Amphibol https://commons.wikimedia.org/wiki/File:Graben_formation.jpg Other types of geology demonstrations: https://www.youtube.com/watch?v=Qnn_nNbYwGE http://tmblr.co/Zyv2Js1bUpvj4 http://tmblr.co/Zyv2Js1NPRTf3 http://tmblr.co/Zyv2Js1omTAgY

[geologicaltravels]

2019: GIFs compiled by geologist Sotiris Valkaniotis of before/afters of strike-slip faulting from the latest Ridgecrest earthquakes.

[paleopals]

This is Split Mountain, a location in Dinosaur National Monument. The monument itself sports the greatest diversity of rock layers in the entire United States National Parks system! 😱

Violently uplifted by the Laramide orogeny, which also built the Rocky Mountains, sediments at some locations in Dinosaur were forced onto their side as the crust bent below.

This particular photo shows thick light Permian sandstones, garnished by colorful Triassic paleosols (prehistoric soil)!

[data-and-vision]

[bettergeology]

Studying and mapping the recently discovered Twin Lakes Fault on Mount Hood, Oregon. This segment bounds Frog Lake, and the lake is being dropped down while the mountain is being uplifted. This is called a normal fault. In most places, the scarp is about 1.5m high. The downed tree crosses the scarp.