The warning of a big earthquake hitting Southern California Tuesday has many shaken up and stocking up. The U.S. Geological Survey said an earthquake with a 7.0 magnitude or greater could strike by Tuesday. The chance of a mega quake went up after a swarm of small quakes near the San Andreas Fault rattled the Salton Sea over a week ago.

The risk is temporarily elevated to 1 percent above normal. In a rare move, San Bernardino city officials have shut down their city hall for a couple days until the risks subside. The building doesn’t meet seismic standards. The warning prompted some to stock up on emergency supplies including 55-gallon drums of water. READ MORE