Eruptive process, effects and deposits of the 1996 and ancient basaltic phreatomagmatic eruptions in Karymskoye lake, Kamchatka, Russia

Авторы: Belousov A., Belousova M.
Сборник: Special Publication of the International Association of Sedimentologists
Том: 30
Глава в коллективной монографии
Год издания: 2001
Издательство: Blackwell Scientific Publications
Местоположение издательства: Oxford, England
Первая страница: 235
Последняя страница: 260
Аннотация: On 2-3 January 1996 an explosive eruption discharging = l0 6 kgs -1 of basaltic magma occurred inKarymskoye lake at an initial water depth of ~ 50 m. Characteristics of the deposits together with analyses ofa videotape of several explosions have allowed us to model the eruptive events. Initial vent-clearing phreaticexplosions ejected blocks of country rocks (up to 3 m diameter) to distances of up to 1.3 km. Then followed10- 20 h of phreatomagmatic Surtseyan activity (100-200 outbursts of water-gas-pyroclastic mixtures toheights of up to 1 km, with initial velocities of 110 m s -1 |. The eruption slugs collapsed back into the lake andproduced base surges (runout up to 1.3 km; average velocity 12.5 m s -1 ). The convective eruption plume rose toa height of 3 km and deposited a thin distal fall deposit. The eruption ended with the ejection of scoria-crustbombs (specific basaltic bombs with dense core and scoriaceous crust).
Добавил в систему: Белоусов Александр Борисович

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