Earthquakes are usually linked to natural movements along faults deep inside the Earth, but in certain situations, human activity can also produce measurable seismic events. Scientists distinguish ...

Each year, approximately 20,000 earthquakes occur globally. Even though most of these earthquakes are weak or occur in unpopulated areas, their destructive potential is clear. While richer nations ...

This story has been updated to add additional information. A 5.6 magnitude earthquake rattled parts of Northern California early Wednesday, according to the United States Geological Survey. The about ...