The tiny Juan de Fuca plate is largely responsible for the volcanoes that dot the Pacific Northwest of the United States. The plates make up Earth's outer shell, called the lithosphere.

YORK, Maine — A small earthquake was reported off the coast of York Harbor Wednesday morning, two days after a larger one in ...

"The Moho is a really interesting boundary for seismologists because it tells us what's happening within and between tectonic plates at depth ... fellow at the United States Geological Survey.

To learn why, where, and how earthquakes happen, you need to familiarize your students with the interior of the Earth and a model called plate tectonics ... and the United States Geological ...