ゆっくり地じ震しん

noun

slow earthquake; low-frequency earthquake; silent earthquake

Seismological term for an earthquake that releases energy gradually over hours to months, often without noticeable shaking. Contrasts with ordinary fast earthquakes.

• ゆっくり地じ震しんは、通つう常じょうの地じ震しんと違ちがって、揺ゆれをほとんど感かんじさせない。

  Unlike ordinary earthquakes, slow earthquakes produce almost no perceptible shaking.

• 南なん海かいトラフでは、ゆっくり地じ震しんが定てい期き的てきに観かん測そくされている。

  Slow earthquakes are regularly observed along the Nankai Trough.