After an earthquake, how long can trapped people survive?

What this is

A national rollup is a story Executive Producer detected breaking in multiple US metros at once. Each contributing market has its own deduplicated cluster from local broadcast, print, government, and community sources — this page links them together so a journalist can see the full national footprint. We are a pointer, not a publisher.Every linked headline goes back to the local cluster and from there to the original outlet — that's the URL to cite. A lead, not the law.