Great aerial photo link.
Looks like there is a huge strip of downed green trees just below the highest and steepest part of the slope.
I can’t tell if the slide fell forward on top of those trees, or, if the ground below the trees just cut loose and took all the tree roots with it.
Check the small print below the main photo at the link I posted, there is a ‘photos’ link.
#’s 5, 7, 11, 16, 20, 22 are the ones to zero in on. #22 gives an great ‘in context’ view - it’s a huge slide - looks to be a good quarter of the hill. I did a quick check of the earthquake maps and nothing to write home about, mostly 1’s. I do know they’ve received a lot of rain in the past month or so, but is that enough to bring down an entire hillside?
I think the main problem now, besides destroyed homes and missing people, is the tons of debris blocking the river. They’re preparing for one of two things to happen tonite - either the river tries to go around the debris dam, undercutting the hill, or the debris dam won’t hold the river and will burst, and they get a wall of water flooding downstream - neither of which are good. I’m sure it will be a long night for locals.