The 4.8-magnitude earthquake in New Jersey was felt across the Mid-Atlantic and Northeast due to the old, cold, and dense rock underlying the East Coast, allowing seismic waves to travel farther compared to the tectonically active West Coast.
A seismologist highlighted that while a 4.8-magnitude earthquake is not usually damaging, it can be widely felt on the East Coast due to the older, colder, and less broken rock structure, causing seismic waves to efficiently travel further.
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