1984/01/01 by H. Eisner, Eisner, H., W. Ambach +3
Earth and Planetary Sciences · Environmental Science · Medicine · #Cryospheric studies and observations #Landslides and related hazards #Science #Winter Sports Injuries and Performance
paper · pdf · doi:10.2312/polarforschung.54.2.85
openalex publication_date 1984/01/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/15
On an approximately 20 m deep firn pit in the area of accumulation of a temperate Alpine glacier, tilting rates of the pit axis have been measured over aperiod of 11 years.During the first interval of thc measuring period (from 1967 to 1974), the tilting rate does not show any disturbance due to the formation of crevasses.The share of the shear strain rate as weil as of the longitudinal and vertical strain rares in the tilting rate of the pit axis is deterrnined.Direct measurements of the longitudinal and vertical strain rates at the pit facilitate the calculation of thc shear strain rate from the tilting rate of thc pit axis.The values obtained in this manner may serve as a basis for the analysis of the rheologjcal proper ties of the temperate firn.During the second interval of the measuring period (from 1975 to 1978), a disturbance occurs due to the formation of a Iransverse crevasse, up to 4 m wide, 33.5 m on the upper side of the pit.In connection with the formation of the creva~e, the limiting value of the longitudinal strain rate for the tensile strength of the temperate firn is determined to be approximately 30.10-a-1.Zusammenfassung: An einem etwa 20 m tiefen Firnschacht im Akkumulationsgebiet eines temperierten Alpengletschers wurden Neigungsnderungen der Schachtachse ber eine Periode von 11 Jahren gemessen.Im ersten Intervall der Meperiode (1967Meperiode ( bis 1974) ) verluft die Neigungsnderung ohne Strung durch Spaltenbildung.Die Anteile der Scherverfortnungsrate