Four earthquakes up to magnitude 4.0 shook Louisiana, raising questions about hidden faults, seismic risks, and the region’s rarely studied geology.

Earthquakes are generally understood to rupture outward from their starting point beneath the ground, sending seismic waves ...

A shake alert went out over the U.S. Geological Survey's early warning system on Dec. 4, warning that a 5.9 earthquake near Carson City in western Nevada could produce heavy shaking in the region. But ...