I’m amused a rockfall went viral. Odds of death by landslide are engineered down to 1:1,000,000 most places in the world. Polite of this large small boulder to not smoosh anyone.https://twitter.com/SheriffAlert/status/1221881862244749315 …
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Meet Porteau Cove, BC, home of unfortunately-oriented heavily jointed rock, oversteepened by glaciers & frequently drenched.
Notice: rock net drape (back), boots (top), drainage holes (bottom right), collection ditch (base)
Steven Earle.
Mika for scale in red raincoat.pic.twitter.com/pGv9ektX7J
Options for mitigating landslides in soft rock (soil) vs hard rock gets both easier & harder since you’re not dealing with individual little enormous boulders.
Mostly it comes down to separating solids from liquids with enormous strainers.
Lions Bay, BC. Mika for scalepic.twitter.com/9WM68UIgDG
Ohno! .gif fail
Ahem. Witness the glory that is a rockfall protection barrier test of preventing ginormous itty bitty boulders from squashing you. 

pic.twitter.com/GSBGD9Qk3N
Autocorrect fail: Porteau Cove has rock *bolts not boots It's fallen down 4x since we built the road in 1958, killing people twice. We have a pretty intense landslide mitigation program relatively speaking, but we have a lot of sketchy slopes. Details:https://www.vancourier.com/news/could-the-squamish-slide-happen-again-1.23142319 …
Q: This is terrifying and I don't trust rocks at ALL anymore. A: Landslides cause $1-2 billion in damage & kill 25-50 people a year in the US. The USGS 2019 landslide hazards budget is $3.5 million. That's all staff, monitoring, research, mitigation: everything. Yay?pic.twitter.com/vLoO1pQox9
What actually makes me a little sad is that @SheriffAlert are ignoring their viral moment. They're treating Twitter as a purely broadcast medium, no replies or acknowledgements.
They could be using this to build kinship & trust. They're not.https://twitter.com/SheriffAlert/status/1221944070089641984 …
Thoughts on the in between size? Source: https://www.youtube.com/watch?v=8wWuH7MIeCA …pic.twitter.com/mYgylbe7TP
The main rock is a car-sized boulder. It's kin to the "large boulder the size of a small boulder" that inspired this. Mitigation for that one is "don't be there" or "rockfall protection nets" depending on slope & traffic.
I'm always reminded of this slide where the geologist arrived and cleared the workers when she realized that wasn't the biggest rock falling on the highway that dayhttps://m.youtube.com/watch?v=CUXhjPkGBtU …
Yeah. YEAH. Protocol is usually « no one enters until the GeoEng gives the all-clear » for VERY good reason.
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