Skip to comments.California earthquake packed unusually wide punch, experts say
Posted on 03/11/2013 8:28:23 PM PDT by BenLurkin
Monday morning's magnitude 4.7 earthquake in Riverside County was the largest temblor to hit the Los Angeles region in three years and has produced more than 100 aftershocks.
It caused no major damage, but it was felt over what seismologists said was an unusually large area.
The quake was initially recorded as three separate quakes because a foreshock tricked seismographs into recording multiple quakes of multiple sizes, said Susan Hough, a USGS seismologist.
Earthquakes of a 4.7 magnitude are typically only felt about 120 miles away from the epicenter, but Monday morning's quake traveled farther, shaking coffee cups as far as Los Angeles. The USGS said it was felt as far away as Arizona.
That's because the quake occurred in the San Jacinto Mountains, which are composed of hard granite rock that transmits energy more efficiently, Hough said.
The quake occurred along the San Jacinto Fault Zone, which runs through San Bernardino, San Diego, Riverside and Imperial counties roughly parallel to the San Andreas Fault. It's one of three fault zones that absorb friction from the motion of the North American continent and the Pacific plates rubbing against each other.
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Pish posh. 4.7 is diddley-do. Didn’t feel it in Altadena.
Nothing in LA. Though I wonder of implications for the San Andreas locked zone.
I lived in Riverside in 1968 - 69 and never experienced a single earth quake but one day I was driving down the main drag in Riverside and my car started shaking and I thought I had broken a blade off my fan or something of that nature so I pulled over and I was still shaking. I inspected my engine and everything seemed to be just fine but I continued to shake.
I was pondering if there might be something else wrong when it quickly dissipated. I thought that my shaking (when I was outside the car) was merely as a result of concern on the condition of my car.
Upon returning to my Apartment complex people asked if I felt the quake and it was only then that I realized why I was shaking even after getting out of my car.
I moved to Colorado about 3 months later.
pasadena nope didn’t feel it.
I agree. 4.7 might get your attention for a bit, but nothing to freak out about.