noun
declaration of a state of emergency
Official announcement by a government or authority that a state of emergency is in effect, often used in legal or disaster contexts.
政府は大規模な地震の後、非常事態宣言を発令した。
The government issued a declaration of a state of emergency after the massive earthquake.
緊急事態宣言 is a more common term for a state of emergency declaration, especially in the context of pandemics or immediate threats, while 非常事態宣言 can sound slightly more formal or legal.
Compound of 非常 (emergency), 事態 (situation), and 宣言 (declaration).