Intensity of Contemporary Exogenous Processes
in the Geysernaya River Valley

Ya.D. Muravyev, V.A. Droznin, O.P. Bataeva

The Institute of Volcanology, FED, RAS , 683006, Petropavlovsk-Kamchatsky, Piip blvd., 9, Russia

Exogenous processes are intensive within the Geysernaya River canyon, which penetrates deeply into sedimentary rocks. These processes are presented, in the first place, by the development of landslips, downfall, erosive activity of the surface waters.
The intensity of exogenous processes in the Valley is proved by the data obtained during the observation of the river draine in the area of the Horizontalny Geyser. There, the geometry of the river-bed
has changed and the river bottom has become 1.5 m deeper during 40-yeared period of observation.
It is obvious that the change of erosion base within the Valley of Geysers may lead to changes in the activity conditions of some geysers as well as to the death of some springs and to the birth of others.