A magnitude-4.2 earthquake struck near Westwood today, but there were no immediate reports of significant damage or injuries, authorities said.

The quake – which hit at 7:36 p.m. and was felt from Ventura County to Inglewood and from Malibu to Santa Clarita – was centered about three miles west-northwest of Westwood, according to the U.S. Geological Survey.

Firefighters conducted a survey of the Los Angeles Fire Dept.’s 470-square-mile jurisdiction, but found no significant damage, said the department’s Erik Scott said.

An officer at the Los Angeles Police Dept.’s West Los Angeles Station near Santa Monica Boulevard, west of Sawtelle Boulevard, said he felt the temblor but he had not heard reports of damage or injuries.

A watch commander at the Santa Monica Police Dept. said there were no reports of damage or injuries in the city. He said the quake caused a small amount of shaking at police headquarters in the 300 block of Olympic Drive between Fourth and Main streets.

The earthquake was initially measured at magnitude 3.7 before being upgraded to 3.8 and then to 4.2.

Lucy Jones, a USGS seismologist and visiting research associate at Caltech’s Seismological Laboratory, initially tweeted that the quake was probably an aftershock of a magnitude 4.4 temblor that struck southeast of Encino in the Santa Monica Mountains on March 17, but she later tweeted that the June 1 quake was too far away from the March quake’s epicenter to be considered an aftershock of what has been dubbed the Shamrock Shaker.

A second temblor with a preliminary magnitude of 1.8 happened about 6 miles north-northwest of Santa Monica tonight at 7:45 p.m., according to the USGS.