An earthquake that originates deep beneath the Earth's surface, typically far below the usual earthquake zone.
From Greek 'bathos' (depth) + 'seismos' (earthquake). This geological term specifically describes seismic activity occurring at great depths within the Earth's crust or mantle.
Bathyseisms can release more energy than surface earthquakes but cause less damage because they're so far from populated areas—it's like throwing a stone into a deep pool versus a shallow one.
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