11 November 2016
St-Luc-de-Vincennes: a spectacular quick clay (?) slide in Quebec
A spectacular landslide occurred yesterday (Thursday) morning at the village of St-Luc-de-Vincennes in Quebec, Canada. Reports suggest that an area about 200 m wide was affected, and as a result several houses have had to be evacuated.
That is an impressive slide. Xania News has this less good in terms of resolution but incredibly interesting image too:
And this is the debris trail, via Mireille Roberge on Twitter:
The shape of the landslide, with the narrow outlet and large bowl, plus the high mobility of the very wet, muddy debris, suggests to me that this might be a classic quick clay landslide. It would be interesting to know whether works had been undertaken on the slope to cause destabilisation. This is a Google Earth image of the site from 2013:
There is no sign of instability in the field, but note right at the toe of the failure, where the debris has entered the stream, there is an active landslide in the imagery:
It is possible that this landslide retrogressed, and then triggered the runaway quick clay (?) landslide.
Previous posts about quick clay landslides
- Possible pre-failure ground deformation at the St-Jude quick clay landslide in Canada
- Possible flowslide (not a sinkhole) in St Jude, Canada
- Norwegian landslide – is this a quick clay slide?
- Vestfold in Norway – an unusual landslide takes out a major highway bridge
- The Rissa landslide – new (old) video available online