SafeCast? https://safecast.org/ https://safecast.org/ - they have a map, too, but it's a mostly-boring "normal background" with a couple of "normal slightly ele

SafeCast? https://safecast.org/ https://safecast.org/ - they have a map, too, but it's a mostly-boring "normal background" with a couple of "normal slightly elevated background" where local geology matters.