remedial measure; measure to settle matters satisfactorily
Formal term used in official, legal, or business contexts for actions taken to resolve a problem or clean up after an incident.
After the accident, the company took remedial measures.
The government is busy with post-disaster remedial measures.
対策 is a general term for countermeasures or measures to deal with a problem, while 善後措置 specifically refers to measures taken after an incident to remedy the situation.
事後処理 means post-processing or handling after the fact, often more procedural, whereas 善後措置 implies a more deliberate, often official, remedial action.
Compound of 善後 (ぜんご, 'aftermath' or 'post-incident') and 措置 (そち, 'measures' or 'disposition'). The term is a Sino-Japanese compound used in formal writing.