“This was a textbook example of why ShakeAlert is so important,” said Dr. Laura Grant, a seismologist at the California Institute of Technology. “In larger quakes, those seconds could literally save lives.”
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Understanding Magnitude and Depth
Magnitude measures the energy released, but the depth and location of the quake often determine how strongly it is felt. Because Monday night’s quake occurred at a relatively shallow depth, shaking was pronounced across San Diego County. By comparison, a deeper quake of the same magnitude might be felt less strongly, even if more people ultimately notice it.
The Human Side of the Quake
For many Californians, the quake brought back memories of past seismic events. Some older residents recalled the 1994 Northridge earthquake, a magnitude 6.7 event that caused significant destruction in the Los Angeles area.
“It wasn’t anything like Northridge,” said a longtime San Diego resident, “but every quake makes you think about whether you’re really prepared for the next big one.”
Parents reported that children were frightened by the sudden jolt, while pet owners said their dogs and cats sensed the tremors even before they did. Researchers have long noted that animals often react to seismic activity moments before humans feel the shaking, though the reasons remain under study.
Official Response and Public Safety Measures
Local and state officials moved quickly to reassure the public. The California Office of Emergency Services (Cal OES) reported that crews were inspecting bridges, freeways, and other infrastructure, though no closures were necessary.
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