This region has many natural disasters such as earthquakes and floods.
災害に備えて非常食を用意しておきましょう。
Let's prepare emergency food in case of a disaster.
A major disaster occurred in that area.
Last year, that village was struck by a major disaster.
We always need to be prepared for disasters.
The town is gradually rebuilding after the disaster.
Taking early measures can prevent disasters.
災害 is a broad term covering any kind of disaster (floods, storms, etc.), while 大震災 is specifically a major earthquake disaster.
災害 is the general word for any disaster (earthquake, typhoon, etc.), while 水害 specifically means damage caused by water/flooding.
災害 is the disaster event itself (e.g. an earthquake or flood), while 被災 describes being affected or damaged by such an event.
disaster-level; extreme; severe
secondary disaster