#earth_tremor__earthtremor__tremor__microseism a small earthquake
supertype: #earthquake__quake__temblor__seism shaking and vibration at the surface of the earth resulting from underground movement along a fault plane of from volcanic activity
subtype: #aftershock a tremor (or one of a series of tremors) occurring after the main shock of an earthquake
subtype: #foreshock a tremor preceding an earthquake
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