YORBA LINDA (CNS) – A magnitude-4.5 earthquake struck near Yorba Linda
today, just hours after a temblor with the same magnitude hit the same area.
There were no reports of any damage from the quakes.
Today’s quake hit at 9:33 a.m. and was centered about two miles north-
northeast of Yorba Linda, according to the U.S. Geological Survey. It was
followed by a magnitude-3.4 after-shock that hit in the same area at 9:51 a.m.
The shakers came about 10 hours after a magnitude-4.5 quake hit the area
at 11:23 p.m. Tuesday.
People near the epicenter described today’s shaker as a short jolt that
rattled windows but caused no immediate damage.
The temblor was felt in downtown Los Angeles, where the Los Angeles Fire
Department went into “earthquake emergency mode,” fire department spokesman
Brian Humphrey said.
“No significant damage or injuries were reported,” Humphrey said.
Kate Hutton with the USGS in Pasadena said there have been about 30
quakes in the same area since last night, “three of which were big enough for
people to feel,” referring to the pair of 4.5 quakes and the magnitude-3.4.
“This is all part of the same earthquake sequence, they’re all in the
same area,” Hutton said. “There’s a couple of ways to look at the sequence.
One is that it’s a double earthquake with two main shocks. Normally an
earthquake sequence has one main shock followed by aftershocks that are smaller
and maybe a few fore-shocks that are smaller. Or it could be considered an
earthquake swarm, where there’s a series of earthquakes that are about the same
size or smaller.
“Either way, this is fairly common activity in California. We haven’t
had anything in the L.A. basin in the last few years but that doesn’t mean
we’re totally quiet, a

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