Advertisement

You are browsing the archive for The Geo Model Blog Archives - The Field.

June 19, 2020

Fold-thrust belt outcrop pattern with doubly-plunging anticline

The latest post from The Geo Models blog.

Read More >>


June 4, 2020

Looking for southern Appalachian rockfall scars using a high-resolution LiDAR dataset

I was able to find what I believe to be a few examples of “boulder tracks” using outstanding LiDAR hillshade imagery from the North Carolina Geological Survey. All features shown occur in generally gneissic bedrock on extensively forested slopes that have been logged within the last century.

Read More >>


May 22, 2020

Slump landslide models, with some rock or debris avalanche characteristics

New from The Geo Models blog: “The model landslides in this post were produced at the same time as the Llusco landslide model I wrote about last year. They were created using a similar setup, but the slide masses behaved very differently during movement.”

Read More >>


May 15, 2020

A simple rift basin sandbox model with normal faults

A simple model of a continental rift basin that develops some characteristics of the real thing can be made by constructing a layered sand cake on top of two overlapping sheets of paper, one of which is anchored to the underlying board, etc. This model setup will produce an asymmetric half-graben style of basin, which has a single, high displacement breakaway fault on one side and several smaller faults on the other.

Read More >>


April 22, 2020

Listric normal faults with glass microbeads

Latest from from The Geo Models: Deformation associated with listric (downward flattening) normal faults produces very interesting patterns.

Read More >>


April 8, 2020

Virtual field trip: East Arm Morant River, St. Thomas Parish, Jamaica (pics & video)

Exploration a slot canyon with a camera between your teeth. Philip Prince takes us on a virtual tour in Jamaica’s Blue Mountains.

Read More >>


April 7, 2020

Interesting reverse faults in a simple extensional sandbox model

The different mechanical properties of the layers are apparent in the dip angles of the normal faults in the model. The master fault on the left side of the model (black line) is less steep in the weak microbeads, an expression of how their failure behavior differs from the stronger layers above and below.

Read More >>


March 25, 2020

Cracked mountaintops Part 2: Sinking summits?

Some upper Devonian sandstone mountains in the Virginia Valley and Ridge show evidence of deep-seated landsliding, resulting in the formation of a downthrown block (graben) along the summit ridge.

Read More >>


March 20, 2020

Cracked mountaintops of the Virginia Valley and Ridge

A newly-released LiDAR data set reveals impressive ridge-top cracks associated with large rock slides in the Virginia Valley and Ridge. While the cracks are easily visible with LiDAR hillshade imagery, they appear to be covered by normal forest vegetation and would probably look like elongated depressions in the forest.

Read More >>


March 10, 2020

A sandbox model without fault(s)?

Fold-thrust belts (both real and model, like this one) develop fault and fold patterns that reflect the properties of the rock (or sand-like materials) being deformed. The model section shown (shown here) is interesting because it results from shortening a granular layer sequence by 50% and does not show any major thrust fault structures that cut through all of the layers…

Read More >>