Thursday, 10 June 2021

How Geology Affects Politics

How Geology Affects Politics 

I came across THIS on Twitter.



In the election results, blue is Democrat, red is Republican. (This counterintuitive for us Brits.)

The fertile soil was good for cotton, - and hence, lots of slaves.

Tuesday, 8 June 2021

Congo Canyon Turbidity Current

Congo Canyon Turbidity Current 

I suspect many of you have seen this on the BBC website, but HERE it is for the rest of us. The turbidity current current occurred on the 14th January 2020 and swept 1,100km into the Atlantic breaking a couple of submarine cables.

The event occurred a couple of weeks after a 50 year flood on the Congo river. This dumped a vast amount of material at the canyon head. There is speculation about why there was a pause between the flood and the turbidity current. The avalanche started at low tide, when the pore pressure inside the sediment is at its highest.

The Congo Canyon has many instruments along its length so the speed of the current could be measured.


Saturday, 5 June 2021

The Scablands

The Scablands 

A correspondent brought THIS VIDEO to my attention and it interested me for two reasons. The first is that it is about the Ice Age Floods of the Scablands in Central Washington which I visited on a WEGA excursion led by Doug Robinson in May 2016. We stayed in Ellensburg which is the home of Central Washington University with which the speaker is affiliated.

The second is that it is a journey back in time. He speaks in front of a blackboard with chalk! It brings me back to the days of my youth.

I haven't watched all of the video yet but the guy seems to know what he is talking about. I'm looking forward to seeing the rest.

Friday, 4 June 2021

Geologic Map of the World - Online

Geologic Map of the World - Online 

I came across THIS WEB PAGE and thought you might find it interesting. You can zoom in and a lot of the sea bed has also been mapped


The UK

And you can get fairly detailed views.


Bristol


There is a vast store of knowledge incorporated and sometimes you can get references to look up when you click on a spot. Happy exploring!

Wednesday, 2 June 2021

Down to Earth Extra - June 2021

Down to Earth Extra - June 2021 

The latest edition of Down to Earth Extra is HERE.

And you can read it below.


Saturday, 29 May 2021

Mantle Plumes - Its Not That simple!

Mantle Plumes - Its Not That simple! 

I came across THIS ARTICLE and it looks like one I should read. But I suspect it will take me a long time! So rather than take forever to understand it and try to summarise it, I will let you do that! Best of luck! 


a | Schematic cross section through Earth’s interior, depicting the key components of plume generation and upwelling near, above and along the edges of a large low-shear-velocity province (LLSVP) and near the core–mantle boundary. These LLSVPs might contain localized ultra-low velocity zones (ULVZs) and along their edges subducted material may pile up over hundreds of millions of years. b | Schematic cross section of a plume root showing the entrainment of subducted materials, LLSVP and ULVZ components, and possibly core materials at the edge of a LLSVP and centred above an ULVZ (that might be a unique deep mantle locality containing partial melt).