Radical New Model of Earth’s Core

July 10, 2013 by Daniela Leave a comment

Earth core

Simon Redfern tackles new ideas about the earth’s core puzzle in BBC News:

Seismic data indicate that the western and eastern hemispheres of Earth’s inner core differ, and this has led some to suggest that the core was once subjected t an impulse – presumably from the collision of a space rock or planetoid which shook the whole Earth. The core, it is suggested, is constantly moving sideways. As it does, the front side is melting and the rear side crystallising, but the core is held centrally by gravity.

With all these seismic complexities, the link between the crystal structure and the geophysical observations has yet to be resolved.

In Scientific Reports, Maurizio Mattesini from the Complutense University of Madrid, Spain, and colleagues propose a novel possibility for the structure of the core: that it is composed of mixtures of different iron arrangements distinguished by the way their atoms pack together.

By comparing seismic data from over one thousand earthquakes across the globe with quantum mechanical models for the properties of iron, they suggest that seismic variations directly reflect variations in the iron structure.

They propose that the eastern and western sides of the core differ in the extent of mixing of these distinct structures, and suggest their results account for the dynamic eastward drift of the core through time.

You can find the entire article here.

Author: Daniela

I will forever be grateful that I was introduced to the utility and beauty of hand crafted products early in life - from the symbolic motifs sewn into the coarse linen fabric of Croatian traditional wear to the colorful Kilim carpets that decorated the parquet floors in my grandmother's living room. I treasure the memories of my grandfather teaching me how to protect myself against the "evil eye," the smell of the flower stalls in the open air market where my grandmother bought produce early every morning for the day’s meals and the summers spent at my great grandmother's where the village wags would come to gossip over thick, black Turkish coffee in her cool stone kitchen. Someone noted that "For all of us that want to move forward, there are a very few that want to keep the old methods of production, traditions and crafts alive." I am a fellow traveler with those who value the old traditions and folk wisdom. I believe the knowledge they possess can contribute significantly to our efforts to build a more sustainable world - one that values the individual over the corporation, conservation over growth and happiness over wealth.