低てい周しゅう波は地じ震しん

noun

low-frequency earthquake

Seismological term for an earthquake with dominant frequencies below about 1 Hz, often associated with volcanic activity or slow slip events.

• 火か山ざんの近ちかくで低てい周しゅう波は地じ震しんが観かん測そくされた。

  Low-frequency earthquakes were observed near the volcano.