noun
slight earthquake; minor tremor
Refers to a weak earthquake, often one that is barely perceptible. Used in seismology and news reports.
昨夜、震度1の微震が観測された。
A slight earthquake of intensity 1 was observed last night.
この地域では微震が頻繁に発生している。
Minor tremors occur frequently in this area.
Compound of 微 (bi, 'slight, minute') and 震 (shin, 'tremor, quake').