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Thread: Joffre aka Last Descents thread
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05-21-2019, 11:41 AM #26
re. Currie.....they're watching and have done an assessment on the very real risks there in the past couple years
https://www.slrd.bc.ca/inside-slrd/c...-risk-analysis
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05-21-2019, 11:42 AM #27Registered User
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Looks like you guys can easily snomobile to the bottom of central next year. Win/win
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05-21-2019, 12:25 PM #28
Stuck up hi-res pictures of the Joffre Slide here in a timeline. When I get some more aerial pictures from Maximus I'll update
http://www.leelau.net/sharonandlee/j...-sharon-bader/
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05-21-2019, 06:20 PM #29
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05-22-2019, 09:23 AM #30
After the first Joffre slide. Before and after.
Pic 1 - rock avalanche trimline extends upwards into trees of Pascall's S face and deep down valley. Pic by MOT technicians.
Pic 2 - Feb 2013 Sharon on her little birthday ski gutting the pow of Joffre's North glacier with vantage point showing the area that will be in the kill zone of the 2019 slide
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05-22-2019, 09:53 AM #31
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05-22-2019, 10:29 AM #32
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05-22-2019, 08:06 PM #33
Anyone calculated just how many cubic meters slid?
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05-22-2019, 08:34 PM #34Registered User
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05-22-2019, 09:14 PM #35
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05-23-2019, 10:53 AM #36Registered User
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Hey, thanks for putting this together. I was about to link Brayshaw's mspaint from twitter on here before I saw you included it. That said here's a different tweet anyway because he's probably a guy worth following - hopefully he'll have more to say on it - and more specifically because I'm waaay out of my depth and I wish I knew more what he meant by this: https://twitter.com/DrewBrayshaw/sta...66185549344768
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05-23-2019, 12:44 PM #37
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05-24-2019, 09:32 AM #38
Last edited by swissiphic; 05-24-2019 at 09:59 AM.
Master of mediocrity.
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05-24-2019, 11:44 AM #39
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05-24-2019, 06:59 PM #40
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05-28-2019, 10:05 AM #41Registered User
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So is that steamy, boulder-on-boulder action geology porn, or geography porn?
If you really want to bust a nut, check out: gigantic boulders mercilessly gangbang highway
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05-28-2019, 08:57 PM #42
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05-28-2019, 09:31 PM #43Registered User
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05-28-2019, 11:01 PM #44
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06-02-2019, 05:31 PM #45
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06-04-2019, 12:05 PM #46
http://www.leelau.net/sharonandlee/?p=7293 Joffre Peak updated timeline with pics from Steve Jones. Thanks Steve - May 23 and June 2nd - further rockfalls
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01-14-2020, 01:13 PM #47
It looks like the best estimate is 2-3 million cubic meters in each of the two slides.
https://blogs.agu.org/landslideblog/...-landslides-2/
There's a detailed analysis here, haven't looked for a PDF copy
https://link.springer.com/article/10...46-019-01332-2
Two catastrophic landslides occurred in quick succession on 13 and 16 May 2019, from the north face of Joffre Peak, Cerise Creek, southern Coast Mountains, British Columbia. With headscarps at 2560 m and 2690 m elevation, both began as rock avalanches, rapidly transforming into debris flows along middle Cerise Creek, and finally into debris floods affecting the fan. Beyond the fan margin, a flood surge on Cayoosh Creek reached bankfull and attenuated rapidly downstream; only fine sediment reached Duffey Lake. The toe of the main debris flow deposit reached 4 km from the headscarp, with a travel angle of 0.28, while the debris flood phase reached the fan margin 5.9 km downstream, with a travel angle of 0.22. Photogrammetry indicates the source volume of each event is 2–3 Mm3, with combined volume of 5 Mm3. Lidar differencing, used to assess deposit volume, yielded a similar total result, although error in the depth estimate introduced large volume error masking the expected increase due to dilation and entrainment. The average velocity of the rock avalanche-debris flow phases, from seismic analysis, was ~ 25–30 m/s, and the velocity of the 16 May debris flood on the upper fan, from super-elevation and boulder sizes, was 5–10 m/s. The volume of debris deposited on the fan was ~ 104 m3, 2 orders of magnitude less than the avalanche/debris flow phases. Progressive glacier retreat and permafrost degradation were likely the conditioning factors; precursor rockfall activity was noted at least ~6 months previous; thus, the mountain was primed to fail. The 13 May landslide was apparently triggered by rapid snowmelt, with debuttressing triggering the 16 May event.
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01-14-2020, 01:33 PM #48
I somehow missed this before now. Holy shit!
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01-14-2020, 02:02 PM #49
if anyone's interested in the full report... https://sci-hub.tw/https://link.spri...46-019-01332-2
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01-14-2020, 02:30 PM #50
Thanks! Was going to use sci hub after work
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