A quake or tremor occurring in the earth's crust — an earthquake (a natural seismic event, described by epicenter and intensity).
今朝、近畿地方で大きな地震があった。
There was a large earthquake in the Kansai region this morning.
地震が起きたら、まず身の安全を確保することが大切だ。
If an earthquake occurs, it's important to secure your own safety first.
この地域は地震が多いので耐震対策が必要だ。
This area has many earthquakes, so earthquake-resistant measures are necessary.