Some 120 seismometers.

• Position: SCIENCE SCENE - 'Earthscope Project' - Brief article

Some 120 seismometers will be positioned strategically to image a key part of the deep roots of North America. The National Science Foundation-funded EarthScope project will consume four years and $1,300,000. "The stable part of the Earth's mantle in our part of the world is the very basis for our continent, yet we know so little about it,"...