"Double-Quake:" More Earthquakes Shake Yorba Linda Area - NBC Southern California

"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



    Quake Swarm Rattles Southern California

    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:

    • 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.

    Earthquakes: Have a Plan in Place

    [LA] Earthquakes: Have a Plan in Place
    “You need to have a plan especially for your family,” said Ken Kondo, program manager with the Los Angeles County Office of Emergency Management. He provides a few suggestions when it comes to being prepared for earthquakes and other disasters. Stephanie Elam reports.
    (Published Monday, April 30, 2012)

    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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