LOS ANGELES (MarketWatch) -- A magnitude 7.2 earthquake struck northwest Mexico on Sunday afternoon, killing at least one person and shaking buildings as far away as Los Angeles. The quake, upgraded by the U.S. Geological Survey from an initial magnitude 6.9 reading, was centered 16 miles south by southwest of Guadalupe Victoria in the Mexican state of Baja California. The Associated Press reported one death in Baja California state capital Mexicali, while various news accounts said some buildings in the city were damaged. The earthquake hit at 3:40 p.m. local time and was located 20 miles underground, according to the USGS.