Relating to or occurring at the epicenter of an earthquake or at the point on Earth's surface directly above the earthquake's origin.
From Greek 'epi' (upon) + Latin 'focus' (hearth, center) + '-al' (adjective suffix). The term describes phenomena at the focus point of seismic activity.
Seismologists discovered that epifocal areas experience the most violent shaking because they're directly above where the earthquake actually ruptures, making them crucial for understanding earthquake damage patterns.
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