Back-to-back magnitude-4.5 and -3.4 earthquakes were reported Wednesday morning near Yorba Linda area, just hours after a magnitude-4.4 quake and several aftershocks were reported in the area.
Wednesday's earthquake was reported at 9:33 a.m. about one mile northeast of Yorba Linda. A magnitude-3.4 quake was reported at 9:51 a.m. in the same area.
"It's hard to tell if this was a quake or aftershock because they were in the same area and same magnitude, so I would call this a double-quake," said Dr. Kate Hutton, staff seismologist at Caltech. "I would call this a cluster or quake swarm. We can expect to see more small quakes-aftershocks."
By 12:30 p.m., more than 10 quakes had been reported in the area:
- 9:33 a.m. - magnitude 4.5
- 9:40 a.m. - magnitude 1.2
- 9:44 a.m. - magnitude 1.6
- 9:47 a.m. - magnitude 2.2
- 9:51 a.m. - magnitude 3.4
- 9:54 a.m. - magnitude 2.1
- 9:57 a.m. - magnitude 1.6
- 10:31 a.m. - magnitude 1.4
- 10:36 a.m. - magnitude 2.9
- 10:44 a.m. - magnitude 1.6
- 10:53 a.m. - magnitude 1.8
- 12:22 p.m. - magnitude 2.7
- 12:56 p.m. - magnitude 1.4
- 1:12 p.m. - magnitude 1.5
- 1:30 p.m. - magnitude 2.2
NBCLA Facebook page visitors reported shaking in Santa Clarita, Carson, Pasadena, Orange, Huntington Beach, Anaheim and other locations.
"It felt bad here in Anaheim -- like a big truck hit the building," wrote Facebook visitor Leo Sanamaria.
Local news from across Southern California
The shaking was something with which newly acquired Dodger Shane Victorino didn't have to deal in Philadelphia. The ex-Phillies player tweeted, "Why is the hotel shaking????? Could u say #Earthquake____________? Welcome to #LA!"
The shaking followed Tuesday night's quake, which occurred in the same area at about 11:23 p.m.
There have been no reports of injuries or damage.
The location of the quake center was near the Whittier Fault, but the quakes could be occurring on an unmapped fault.