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"Double-Quake:" More Earthquakes Shake Yorba Linda Area

"I would call this a cluster or quake swarm," said Dr. Kate Hutton, staff seismologist at Caltech

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    NEWSLETTERS

    Scientists are calling the earthquakes that struck near Yorba Linda Tuesday night and Wednesday morning are being called a "quake swarm," or a "double quake" because there were two temblors -- a 4.4 and 4.5 -- that were similar in size. Patrick Healy reports from Caltech in Pasadena for the NBC4 News at 5 p.m. on August 8, 2012. (Published Thursday, Aug 9, 2012)

    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:

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    • 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.

    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.

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