YORBA LINDA – Another small quake shook Yorba Linda this morning at 5:24. According to the U.S. Geological Survey, a magnitude 1.7 earthquake shook just two miles northeast from Yorba Linda. There were no reports of damage.
The shaking was an echo of the four notable earthquakes that occurred in the Chino Hills area Thursday night, just north of Yorba Linda, greatly accelerating a swarm that was called "curious" and "unusual" last week by one of Southern California's top seismologists. The latest shakers Thursday came at 8:27 p.m., when a 4.0 quake occurred, followed one minute later by a 3.0 in basically the same spot. And there was a 2.5 quake at 9:04 p.m.
The shaking began at 4:56 p.m., with a 3.8 quake. It's unusual for a smaller quake to be followed by a second quake slightly larger in magnitude. However, seismologists say such things happen, and it doesn't necessarily mean that a much larger event is imminent.
All three quakes occurred in a region that's had a "swarm" of quakes since early March. The quakes are also close to the area of the Chino Hills – the so-called Yorba Linda trend – that produced a 5.4 quake last July. The region is close to the Chino and Elsinore fault zones.
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Personal note - Red Cross conducted roll calls on the CLARA repeater, and I texted with Brian T. about the event.
That night I refilled my gas tank, recharged a redundant portable battery and filled up a couple jugs in the garage with water. However, The Big One didn't happen the next morning. ;-(
