"Earthquakes pop off around the state, and it's a little bit like popcorn that they hit - sometimes they bunch up for reasons that we don't understand," said Susan Hough, seismologist for the U.S. Geological Survey. This analogy highlights the unpredictable nature of seismic activity in Southern California, where quakes can occur in clusters without clear reasons.
Lucy Jones, a Caltech research associate, reported that Southern California has experienced 15 independent seismic sequences this year, the highest annual total in the last 65 years, indicating a significant increase in moderate seismic activity.
The most recent earthquake, a magnitude 4, struck near Ontario International Airport, with five earthquakes of magnitude 3 or higher occurring in the city over the last month, illustrating the heightened seismicity in populated regions.
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