USGS

Nearly 9,000 Ohio residents reported feeling tremors because of an earthquake centered under Lake Erie. Since 1823, the northeastern Ohio seismic zone has had "moderately frequent earthquakes."

The earthquake's epicenter was far inland, away from the country's main highways that run along mountain ranges.

An earthquake of preliminary magnitude 4.2 hit Wednesday night. Earthquakes used to be rare in Oklahoma. Scientists say they're linked to the disposal of wastewater from fracking.

Groups of walruses are vulnerable to disturbances, but it's hard to avoid them if you don't know where they are. A new tool from U.S. and Russian researchers draws on history to protect the animals.

Parts of Oklahoma and Texas have about the same risk of an earthquake as parts of California, the maps show. Why? Wastewater that oil and gas operations are pumping into wells adds pressure on faults.

Oklahoma's earthquake boom is now a national security threat. No damage has been reported, but operators at the hub are on high alert for a disruption that would ripple through the U.S. energy market.

The 7.5-magnitude earthquake caused evacuations from buildings in Afghanistan, India and Pakistan. The Associated Press reports, More than 228 deaths and 1,000 injured in Pakistan alone.

Seismologist Lucile Jones discusses how accurate — or not — the plot of this new California earthquake thriller really is. Bonus: Her advice on what to include in an earthquake kit.