Nizhne-Koshelevsky New thermal field is located on the watershed between Gremuchiy and Pryamoy brooks in close proximity (300-400 m) to the well-known Nizhne-Koshelevsky thermal anomaly. It was found in 2008 year as a result of vegetation burn on the area of 200 х 200 m and rise of ground temperature up to 100 ºC in the central part of the field. Starting from 2009, the given new formed field has been annually observed (in summer field working period): areal temperature surveyings and lithogeochemical (mercurymetrical) testings of soil-pyroclastic deposits are conducted, their section studies in the central and periphery of the field are carried out, vegetation boundary changes are registered, geophysical works are organized. The change of temperature and geochemical conditions of the thermal field over a period from 2009 to 2013 is also traced. Generalization of findings and regular researches continuation in the area of Nizhne-Koshelevsky New thermal field will make it possible to answer the question about the nature of the given phenomenon.

Based on detailed volcanological and tephrochronological investigations, parameters of catastrophic eruptions of the Molodoy Shiveluch volcano accompanied by formation of the giant debris avalanches in 1430, 1854, and 1964 have been evaluated and pre-history of their preparation has been reconstructed. Considerable attention has been given to the description of the 1964 explosive-collapse debris avalanche and a new mechanism of its formation is suggested. It is shown that similar mechanism was typical of the other two debris avalanches. Appearance of the giant debris avalanches was predetermined by various forms of andesite magma existence and by regularities of eruptive activity of the volcano in Holocene. Power and geologic-geomorphological effect of the 1854 eruption as well as size and volume of the associated debris avalanches have been revised and estimated as decreasing. Based upon productivity of the Molodoy Shiveluch volcano in XIX-XX centuries the next eruption of the 1964 type is supposed to happen in 60-90 years.

The paper presents data on identified and described short-term local (1955−1976) enhanced volcanic activity within the Northern Group at the Central Kamchatka Depression and regional disasters (1907-1976), clearly revealed within Kamchatka Peninsular and the Kurile Islands. In scale (volume is about 9 km3, weight of erupted and replaced productswas calculated to be about 16×109 t), the local volcanic disaster was the most powerful in Kamchatka and Kurile Islands over the period of the last 2000 years. This volume exceeds 80% of ~19×109 t totally erupted by all volcanoes over the same period of time. Over the period 1907−1976, the Kamchatka and Kurile volcanoes erupted and transported about 29.5×109 t of juvenile and resurgent material while other volcanoes in the world erupted about 122×109 t.