A major aftershock rattled Southen California Friday morning after the largest earthquake in 20 years shook the region the day before.
The U.S. Geological Survey says at 4:07 a.m., a 5.4 magnitude aftershock was recorded about 11 miles from the city of Ridgecrest.
The original quake, a magnitude-6.4, happened Independence Day morning in the Mojave Desert.
Residents as far away as the Central Coast reported feeling the rolling quake.
Seismologist Lucy Jones warned Thursday that strong aftershocks would follow the main quake.
“Some of those aftershocks will probably exceed magnitude 5 which means they will become damaging,” Jones said.
State emergency officials are urging Californians to prepare for future earthquakes by preparing emergency kits and practicing drills.