noun
atmospheric vibration; infrasound
Technical term for low-frequency sound waves in the atmosphere, often associated with volcanic eruptions or large explosions.
火山の噴火に伴って空振が観測された。
Atmospheric vibrations were observed accompanying the volcanic eruption.
空振は人間の耳には聞こえない低周波の音波だ。
Infrasound is a low-frequency sound wave inaudible to the human ear.
Compound of 空 (くう, 'air, atmosphere') and 振 (しん, 'vibration, shaking'). The reading しん for 振 is a Sino-Japanese on'yomi.