微び小しょう地じ震しん

noun

microearthquake

Technical term in seismology for a very small earthquake, typically below magnitude 2.0 and not felt by people.

• この地ち域いきでは微び小しょう地じ震しんが頻ひん繁ぱんに観かん測そくされている。

  Microearthquakes are frequently observed in this region.