NORFOLK, Va. — Fault lines are fractures or breaks in the Earth's crust where tectonic plates move past each other, often resulting in earthquakes. These geological features are classified into three ...

Over the last several weeks, earthquakes have rocked parts of the United States from Alaska to Wednesday morning's quake in Tennessee. The most recent quake registered as a magnitude 4.4, just ...

Gear-obsessed editors choose every product we review. We may earn commission if you buy from a link. Why Trust Us? Two opposite types of faults, normal and reverse, help explain our undersea mountain ...