Microquake

Part of speech: noun

Definitions

1. A very small or minor seismic event caused by the sudden release of energy within the Earth's crust, often too weak to be felt by humans but detectable by sensitive instruments
2. An imperceptible earthquake characterized by minute ground vibrations and low seismic energy typically recorded by specialized monitoring devices
3. A subtle tremor occurring within the Earth's surface involving slight displacement and minimal impact, usually measured only by seismographs designed to capture small-scale geophysical activity

Etymology: "Micro-" comes from Ancient Greek "mīkrós", meaning "small," and it entered English as a combining form used to build technical terms. "Quake" is an older English word for shaking or trembling, and it has long been applied to the ground moving beneath our feet. Joining the two gives a compound that describes a shaking so slight that people almost never feel it. The term is a modern scientific coinage. Ancient Greeks had "mīkrós" and never combined it with anything resembling a seismic sense, so the word belongs to the vocabulary of seismology rather than to any older tradition. Its meaning follows the instruments that detect it: a microquake is defined by what a seismograph can record, not by what a person standing on the ground would notice.

Synonyms: minor earthquake, small quake, tremor

Antonyms: major earthquake, megaquake