01817pab a2200193 454500008004000000100002200040245010600062260000900168300001400177362000800191520120600199650002901405650001501434700002301449773002001472909001001492999001701502952010401519180718b2002   xxu||||| |||| 00| 0 eng d  aLaternser, Martin  aTemporal trend and spatial distribution of avalanche activity during the last 50 years in Switzerland  c2002  ap.201-30.  aNov  aAvalanche observations are an important factor for operational avalanche warning and the main parameter to carry out an objective verification of the avalanche bulletin in retrospect.  For the first time, a 50-year long series of avalanche activity data of 84 Swiss avanche observation stations is analysed and discussed.  After careful data preparation a regional avalanche activity index (RAAI) for seven snow-climatological regions of Switzerland was developed.  Using different statistical descriptors, we were unable to detect a long-term change in avalanche activity, which stands in contrast to a significant increase of winter percipitation.  The comparison of the RAAI with a comprehensive database for destructives (DADB) resulted in a low correlation.  This shows clearly the difficulties involved in determining a good measure for specifying the true avalanche activity.  Depending on the degree of the avalanche activity DADB and avalanche observations represent the avalanche activity differently and overlap.  Suggestions are given for the improvement of the ongoing avalanche observation programme in order to achieve an overall consistent and reliable data set in future. - Reproduce.  aAvalanches - Switzerland  aAvalanches  aSchneebeli, Martin  aNatural Hazards  a54751  c54751d54751  00104070aIIPAbIIPAd2018-07-19hVolume no: 27, Issue no: 3pAR55196r2018-07-19w2018-07-19yAR