Item: Infrasound Detection of Avalanches in Grasdalen and Indreeidsdalen, Norway
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Title: Infrasound Detection of Avalanches in Grasdalen and Indreeidsdalen, Norway
Proceedings: International Snow Science Workshop 2016 Proceedings, Breckenridge, CO, USA
Authors:
- Tore Humstad [ Norwegian Public Roads Administration, Molde, Norway ]
- Ørjan Søderblom [ Sogn og Fjordane University College, Sogndal, Norway ]
- Giacomo Ulivieri [ iTem s.r.l, Florence, Italy ] [ Department of Earth Science, University of Florence, Florence, Italy ]
- Stian Langeland [ Wyssen Norge AS, Sogndal, Norway ]
- Halgeir Dahle [ Norwegian Public Roads Administration, Molde, Norway ]
Date: 2016-10-02
Abstract: Infrasound technology for detection of snow avalanches has been tested in mountainous terrain in Norway over the two last winter seasons. Two valleys, Indreeidsdalen and Grasdalen, were selected as test localities for the infrasound arrays because they both are exposed to avalanches from different aspects and several paths. Hence, a detection of an avalanche in one path would be a crucial indicator of the danger also from other paths. Before 2014, Norwegian authorities have traditionally made little use of technical measures to automatically detect avalanche and landslide activity, and infrasound detection of avalanches had not been tested in high latitudes with sparsely vegetated terrain. Hence, the Norwegian Public Roads Administration wanted to test infrasound both for technical and strategically reasons. In addition to temporal recognition of avalanches, spatial analysis of the avalanche paths were made based on the azimuthal location of the infrasound sources and a GIS study of the surrounding terrain. The results from the two seasons are promising, and this article summarizes some developments.
Object ID: ISSW16_P1.25.pdf
Language of Article: English
Presenter(s):
Keywords: infrasound, avalanche detection, forecasting, IDA
Page Number(s): 621-627
Subjects: avalanche forecasting avalanche detection infrasound
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