ABSTRACT
Norway’s landscape is characterized by valleys and fjords with a relief of >1,000 m. Rockfalls, snow avalanches and debris flows are common, and 72,000 people live in areas potentially exposed to hazard. A state funded hazard-mapping program was launched by the Norwegian water resources and energy directorate (NVE) in 2011, executed primarily by private consultants with varying geological expertise and limited fieldwork conducted. The Geological survey of Norway (NGU) has therefore developed a new supporting quaternary geological map product. Building upon NGU’s traditional geological maps; the new maps defines rockfall-, snow avalanche- and debris flow deposits which are tracked by detailed genetic origin and distinguishes between rock fall boulders and glacial erratics. The new maps include geomorphological features and show in detail where processes have acted through the Holocene. Recurrence times are indicated through thickness of deposits and number of tracks. The detailed geological maps also support input data and calibration of numerical modeling tools for simulating landslide run-out.
