The 1990 Submarine Slide Outside The Nidelv River Mouth, Trondheim, Norway.

The Trondheim harbor has been the locus for many large flow slides during the last century. The most recent of these occurred in 1990 just outside the mouth of the Nidelv River and mobilized ca. 5 106 m3 of sediments. The mass movement took place as a liquefaction-induced flow slide outside the river outlet and developed into a lateral spread. The sediment mass slid along a weak layer of loose silty sand recognized by a distinct seismic reflection interpreted from high resolution seismic data. A combination of static and dynamic loading probably triggered the slide. [ABSTRACT FROM AUTHOR]