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Informe Rissa
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The Rissa landslideApril 29th, 1978
Rissa is situated 40km from Trondheim
A closer look at the area
Here the slide started....
Excavation for a new wing on the barn
Works started on Friday afternoon and continued on Saturday
Two excavators in work The excavation works
produced 700m3 of material
the soil mass was deposited at the shoreline in a 2m high fill
Summary of the slide activity Initial sliding took place
for about 30 minutes The main slide involved
about 6 mill. m3 masses Very rapid progression,
the main slide may have lasted less than 5 mins.
Several afterslides took place the next few days
Sincere flooding damage at the village of Leira on the opposite side of lake Botn
Leaching the ions out of the clay
High freshwater gradientsPermeable fissured rock massif
Plateau for accumulating precipitation
But now, the videotape..