California was hit by the earthquake at 9.52am (5.52pm BST).
The earthquake hit 96km from LA, 16km from San Bernardino and 5km from Moreno Valley.
Earthquake tracker CSEM-EMSC said the quake struck at a depth of 14km.
The website said more than 400,000 people lived in the ‘felt area’ of the California earthquake.
One resident described the quake, which registered a relatively weak 3.2 magnitude, as “very loud and strong”.