A magnitude 4.9 earthquake struck south of Shreveport in Louisiana on Thursday morning, the U.S. Geological Survey said, the second-largest recorded tremor in the state's history. The quake had a depth of 3.1 miles and struck 6.2 miles west of Edgefield, Louisiana, in the Red River Parish area. It occurred at around 5:30 a.m. local time. The USGS said there is a green alert for shaking-related fatalities and economic losses, meaning a low likelihood of casualties and damage. Shreveport, which