The quake hit at 6:11 a.m., and it was epicentered 4.8 miles east-northeast of Ridgecrest. At a depth of 5.5 miles, it was felt far and wide.
The temblor is believed to have been the biggest aftershock recorded in the region. There have been hundreds of them, but none greater than magnitude 3.9 in recent days.
The 4.9 report was based on a seismologist’s finding, not a computer- generated report.
The Los Angeles Fire Department reported after the aftershock that it is in “earthquake emergency mode” with fire department vehicles and helicopters patrolling the department’s jurisdiction to identify any damage or emergency needs, said fire department spokeswoman Margaret Stewart.