В результате геолого-геоморфологических и тефрохронологических исследований одного из самых активных в Центральной Америке вулкана Момотомбо (Никарагуа) с целью оценки вулканической опасности построенной у его подножия ГеоТЭС, была восстановлена история формирования вулкана с момента его возникновения (4000-4500 лет назад) до настоящего времени. Крупнейшие извержения вулкана датировались МС методом, было прослежено площадное распространение тсфры, оценены объем и масса изверженных пород в целом и по отдельным эруптивным этапам. Проведенные исследования позволяют заключить, что все сооружения ГеоТЭС находятся в опасной зоне, а наибольшая опасность может быть связана с выпадением тефры. До конца XX века может произойти извержение с объемом материала порядка 50-100 млн. м3. В зависимости от ориентировки выбросов, скорости и направления ветра мощность тефры в районе ГеоТЭС может быть в пределах 20-150 см.

Through radiocarbon techniques we determir the age (30 000 yrs) of the latest in the Late Pleistocene directed blast at the Avachinsky volca and approximately calculated the age of the previous large catastrophic eruption of the same type (35 00( 40 000 yrs). Coarse debris deposits produced by the eruption originally covered the area of 400 km2 a their volume was 16-20 km3. As a result of these eruptions the relief cardinally changed to the south of t Avachinsky and the lower part of the Avacha river channel was transported to the distance of 6-10 km. 11 believed that in the nearest hundreds of years such blasts will not take place but this forecast does not apply the adjacently located Koryaksky volcano.

The 1645 B.C. oxygen peak in Dye 3 borehole (65.18 N, 43.49 W) drilled in the Greenland ice sheet is shown to have been the catastrophic caldera-generating Aniyakchak eruption (56.88 N, 158.17 W) on Alaska Peninsula, U.S. rather than the famous Minoan eruption (36.404 N, 25.396 E) on Santorin Island, Greece.

We studied the tectonic setting, morphology, geological structure, the history of eruptive activity and the evolution of the composition of the erupted material of Kizimen volcano (Kamchatka) from the moment of its origination (12-11 thousand years ago) to the present time. Four cycles 2-3,5 thousand years long each were distinguished that characterize the activity of the volcano. All largest eruptions were dated, their parameters determined. We also estimated the volume and the mase of the erupted products, volcanic intensity of evacuation of material during-periods of high activity and productivity of the volcano at different stages of its formation. It has been shown that evolution of the composition of the rocks erupted (from dacite to basaltic andesite) takes place as a result of mixing of dacitic and basaltic magma. It is proposed that future eruptions that may take place at Kizimen will be similar to those at Bandai (1888) and Mount St. Helens (1980) volcanoes.