The U.S.-Mexico border was rocked by a magnitude-5.7 earthquake Monday night.
It rattled the same region recovering from the deadly Easter jolt. The U.S. Geological Survey said the quake was centered five miles southeast of Ocotillo in Imperial County -- about 85 miles east of San Diego.
It struck Monday at 9:26 p.m. PDT. The USGS originally reported the quake as a magnitude 5.9 but later downgraded it to a magnitude 5.7.
The quake was an aftershock of the deadly Easter Sunday magnitude-7.2 quake that shook Baja California and Southern California, according to seismologists. They said the epicenter of Monday's quake occurred in the same zone of the quake in April.
"It was a big break along a fault in Baja and up into the U.S.," said Kate Hutton, of Caltech. "It caused the crust to re-adjust itself by having a further series of earthquakes and these are all aftershocks.
"Most occur on the same fault zone as the main shock, but they can branch off. they can be on adjacent faults also. This is a large member of the this aftershock sequence."
Aftershocks from the April 4 quake could continue for about 10 years.
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Thousands of aftershocks have occurred since the Easter earthquake. More than 100 aftershocks were recorded immediately following Monday's 5.7 quake, with the largest measuring at magnitude-4.5.
The quake was felt in Apple Valley, where one viewer described it as a "small rolling motion, nothing strong."
A viewer in Hemet wrote, "It was a small roll, then second that shook the mobile that I live in. The chandelier shook back and forth. At first I thought it was one of my cats jumping on the chair, however it kept going, and the cat ran starting crying."
In San Diego, the foul poles at Petco Park swayed and the interleague game between the Padres and Toronto Blue Jays was briefly stopped.
David Eckstein of the Padres had just grounded out in the bottom of the inning when the stadium began shaking. The next batter, Chase Headley, stayed out of the batter's box for a few seconds, then stepped in.
The quake followed a series of temblors that struck Southern California over the weekend, including a pair of moderate earthquakes that rattled a desert area east of San Diego. Residents in downtown San Diego felt the ground rumbling during at least one of the Saturday quakes.
Did you feel it? Send us your earthquake stories or photos to isee@nbclosangeles.com.
