A strong earthquake shook Southern California on Tuesday, causing buildings to sway and triggering some precautionary evacuations. There were no immediate reports of damage or injuries. The jolt was felt from Los Angeles to San Diego, across the border in Tijuana, Mexico and slightly in Las Vegas. The 11:42 a.m. quake was initially estimated at 5.8 by the US Geological Survey but was revised downward to 5.4. More than a dozen aftershocks quickly followed, the largest estimated at magnitude-3.8. The quake was centered 46 kilometers southeast of downtown Los Angeles near the San Bernardino County city of Chino Hills, and was estimated to be about 13 kilometers below the earth's surface. "It will certainly cause cracked plaster and broken windows, but probably not structural damage," said seismologist Kate Hutton at the USGS office in nearby Pasadena.