UPDATED with more details: A magnitude 4.7 earthquake struck Malibu and surrounding communities at 7:28 a.m. this morning, the U.S. Geological Survey said. A 2.8 aftershock struck a few minutes later, followed by four more magnitudes ranging from 2.7 to 3.5 over the next hour or more.

The first quake, originally reported as a 5.1 but later downgraded, was centered five miles north of Malibu and had a depth of seven miles, the USGS said. There have been no reports of injuries or significant damage.

In a televised question-and-answer session shortly after the quake, USGS seismologist Lucy Jones said, “We’ve had more than the average (number of) magnitude 4 earthquakes in Southern California this year — the average is about eight magnitude 4 series, that is, series of at least one magnitude 4 … So far we’ve had 14 in Southern California; the largest in previous years was 13.

“Now, these numbers are small,” she added. “They’re not statistically significant yet.”

Indeed, Southern California has seen a spate of earthquakes in recent weeks. A magnitude 4.4 quake centered in Pasadena rocked the region on August 12, days after a magnitude 5.2 quake struck Bakersfield and was felt throughout LA County. Last week, a series of smaller quakes, including a magnitude 3.9 quake struck near Ontario, about 35 miles east of downtown LA.

Jones added during her question-and-answer session today: “It’s notable that some of the strongest shocks — not surprisingly — are occurring just off the west side of Los Angeles,” she said. She said they were felt as far south as Irvine, nearly 65 miles south of the posh beach community of Malibu.

As always, there is a 5 percent chance that today’s quake is a foreshock of a larger one. “In Southern California, everyone is within five miles of an active fault,” Jones reminded.

According to the USGS, the epicenter of the earthquake was 4.9 miles (7.9 kilometers) southwest of Agoura Hills, 6.4 miles (10.3 kilometers) southwest of Agoura and 7.1 miles (11.4 kilometers) southeast of Thousand Oaks.

The earthquakes come as three major wildfires continue to rage in Southern California.