Another earthquake of 7.1 magnitude hit Southern California on Friday night after a 6.4 magnitude earthquake the previous day which left cracked buildings and roads, leaking water and gas lines.
The US Geological Survey predicts there is a 1 percent chance of another magnitude 7 or higher earthquake this week and raised concerns about the possibility of large aftershocks.
The 7.1 magnitude earthquake is the largest tremor in America since 1992, when a 7.2 magnitude earthquake struck Cape Mendocino.