緊急事態

1. Origins, structure, and basic meaning

• Structure: 緊急事態(きんきゅうじたい) means an emergency requiring urgent action.
• Basic usage: It is used for preparing for emergencies or informing others that one has occurred.

2. Common pitfalls and similar expressions

• What someone prepares for
  • 緊急事態に備えて means in preparation for an emergency.
• What is communicated and to whom
  • In 緊急事態の発生を乗客に知らせた, を marks the reported occurrence and に marks the passengers who were informed.