Back-to-Back Earthquakes Rattle Southern California

A magnitude-3.8 quake struck just minutes after a magnitude-3.7 hit the same area

By Christina Cocca
|  Thursday, Sep 19, 2013  |  Updated 8:57 AM PDT
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Workers at a Pomona doughnut shop describe the shaking felt during two earthquakes early Thursday in the Pomona area. Jacob Rascon reports for Today in LA on Thursday Sept. 19, 2013.

Joel Cooke

Workers at a Pomona doughnut shop describe the shaking felt during two earthquakes early Thursday in the Pomona area. Jacob Rascon reports for Today in LA on Thursday Sept. 19, 2013.

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Southern Californians from inland areas to the coast received a wake-up call early Thursday when two earthquakes struck -- the first with a preliminary magnitude of 3.7 followed by another measured at magnitude-3.8 -- two miles north of Pomona.

Earthquakes Page: Maps, Resources

The first quake hit about 4:43 a.m. one mile southwest of La Verne, followed by the second quake just 20 minutes later.

NBC4 viewers reported feeling the quake in Alta Loma, Anaheim, Azusa, Chino Hills, Claremont, Corona, Covina, Diamond Bar, Duarte, Eastvale, Fontana, Fullerton, Garden Grove, Glendora, Hacienda Heights, Huntington Beach, La Puente, La Verne, Monrovia, Monterey Park, Newport Beach, North Hollywood, Ontario, Orange, Phillips Ranch, Riverside, Rowland Heights, San Dimas, Upland, Walnut and Whittier.

Even two people from Acton, more than 75 miles away from the epicenter, said they also felt the quake.

Employees at a Pomona doughnut shop were getting ready for business when they felt shaking. Employees said the metal gate at the building's entrance rattled.

"You hear it first, then all of the sudden it starts shuddering," a worker told NBC4.

One NBC4 viewer said the quake was the biggest they’ve felt in 10 years. An Ontario resident said the earthquake "felt like an underground explosion."

The second jolt felt like the "repercussion of a bomb," Chris, from Glendora, told NBC4. Closest to the quake, Aggie in La Verne said the shaking sounded like a freight train.

There were no reports of damage in the quake.

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