Discover and read the best of Twitter Threads about #sfunaturalhazards
Most recents (5)
1/2 Huaynaputina erupted in the area we are working in 1600 with volcanic explosivity index of 6, the largest historic eruption in South America. There is tephra everywhere. Some of it has been reworking into these amazing tephra dunes! #SFUNaturalHazards #PeruvianGeology 
2/2 The initial tephra fall was devastating to local communities, many being completely buried, with buildings collapsing as far away as Arequipa. Interesting taphonomy of this tephra, since even >400 years later the tephra is still being redeposited. #SFUNaturalHazards
1/2 More info on the tephra dunes. They can also form across small gullies like the one shown here. IN 2017 an unusual, intense rainfall event, triggered by el Nino, caused a lake to form behind the dam, the dame to fail and triggered a debris flow....more
1/ Spent an enjoyable Friday (March 15) with the amazing Dr. Corinne Griffin on the EASC 403 Quaternary Geology Sea to Sky Fieldtrip. It covers glacial geology and, naturally, Natural Hazards. #SFUNaturalHazards #SFUGlacialGeology
2/ Charles Creek Debris flow retention structure. Poor land use decisions (not recognizing debris flow hazard on fan deltas) resulted in deadly consequences followed by construction of several types of debris flow protection structures. They work.
3/ Porteau Cove. Area of shallow water because of a submarine moraine, makes this a good site for a ferry dock and diving. Day lighting joints along road can lead to rock fall issues, such as happened in July 2008. Caused a bit of a kerfuffle in terms of the Olympics.
Headed to the Northshore with alumni grad student par excellence @CarieAnnLau to check out the effects of Thursdays pineapple express. Lots of sediment in Mosquito Creek. @NVanDistrict working on removing it before the next storm comes in tonight. #SFUNaturalHazards
Lots of great, new sediment capture basins in @NVanDistrict. Idea is to stop culverts from getting plugged and causing diverting of flow and flooding. This one has a dip in the trail in case it does plug, it will keep the water in the right place. #SFUNaturalHazards
Small debris slide Upper Mosquito Creek just downstream of the debris retention netting. Still waiting to see this netting capture the next debris flow! Maybe tonight? Seem to be hiting the peak of the storm right about now.#SFUNaturalHazards
Wednesday Dr. Gio Roberti made his supervisors proud by defending his thesis in Clermont-Ferrand. Gio did a cotutelle between SFU and Univeristé Clermont Auvergne with Benjamin van Wyk de Vries and me (Brent Ward) as supervisors. #SFUNaturalHazards
His thesis was on the landslide hazard at Mt. Meager, a volcano north of Pemberton. The examining committee was impressed and the thesis was accepted as is, no revisions. Left to right Marta Chiarle, Susan Conway, Ben, Gio, me, Marco Giordino. /2 #SFUNaturalHazards
After, the other graduate students put on a slide show/skit/roast that highlighted Gio’s affect on the department. “Did you know there are volcanoes in Canada?” It was excellent, and only slightly embarrassing to Gio./3 #SFUNaturalHazards
1/Spent last Saturday with Kelly Russel, UBC, exploring Mt. Meager, a volcano north of Pemberton. It last erupted 2360 years ago, and also produces numerous landslides, shown me me here is the 2010 landslide. #SFUNaturalHazards #MtMeagerHazards
2/ Extensively hydrothermally altered rocks make this Canada’s most dangerous mountain and the 2010 landslide (pictured before) was the largest in Canadian history. Gio Roberti, my PhD student, explains the dynamics of this failure. #SFUNaturalHazards. #MtMeager
3/ There was a complex rheology and hummocky landslide debris. The river has cut a nice section through one of the hummocks. This one has uniform lithology so likely a large block that became fractured. #SFUNaturalHazards #MtMeager
