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A 4.2-magnitude earthquake struck San Diego County, according to the U.S. Geological Survey, with shaking felt in Orange County and the Inland Empire.
A pair of massive earthquakes rocking southern california back-to-back days, sparking fires, rattling homes and stores as many caught in the violent shaking ran to escape. >> my daughter said it won't stop trembling. >> first came the magnitude 6.4 followed by an even more powerful 7.1 earthquake. if the epicenter near the city of ridgecrest. the shaking felt from los angeles to as far north as sacramento from as far east as phoenix, and to the south in mexico. it's the strongest seismic activity to hit the area in two decades. >> this is the scene where watching play out all over the heart in...
>> so explain what you mean by that. >> the earthquakes when they are this big, magnitude 8 and they're shallow, the surface waves they create have a very long period. they're very large. they are the ones that cause the shaking, the damage. the smaller aftershocks, they have a lot more higher frequency. and so, you know, it takes a bit more work to find them in that coda. >> sure. so if i'm understanding you correctly, that's not to say they're not taking place. it's just is that you haven't detected them because of the strength of the initial quake. that correct? >> yes. as the time goes on,...