地震

1. Origins, structure, and basic meaning

• Structure: 地震(じしん) is a noun for an earthquake, a natural event in which the ground shakes.
• Basic usage: A possible occurrence appears in 地震が起きた場合, while a later time appears in 大きな地震の後.

2. Common pitfalls and similar expressions

• Occurrence and preparation
  • It can refer to an actual earthquake or to a simulated earthquake scenario in a disaster drill.
• Time connection
  • Use 地震の後 for the time afterward and 地震が起きた場合 for a condition in which one occurs.