A long, rolling temblor felt here in Los Angeles but centered in Baja, Mexico, south of Mexicali. Hit about 3:40 p.m. Pacific. Initial measurements put it at magnitude 6.9.
*Update: The USGS has revised the earthquake to a magnitude 7.2 centered 38 miles south of Mexicali. Two relatively big aftershocks, one 5.4 and the other 5.1, hit nearby. Imperial, California, also got rattled by a 5.1-magnitude temblor at 4:15 p.m.