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..