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Articles
Мелекесцев И.В., Базанова Л.И., Двигало В.Н. Почему в 1738 году С.П. Крашенинников назвал Авачинскую сопку на Камчатке "Востроверхой"? // Тезисы докладов ежегодной научной сессии, посвященной Дню вулканолога, 3-4 апреля 2002 г., г. Петропавловск-Камчатский. Петропавловск-Камчатский: КГПУ. 2002. С. 4-6.
Мелекесцев И.В., Брайцева О.А. Гигантские обвалы на вулканах // Вулканология и сейсмология. 1984. № 4. С. 14-23.
Мелекесцев И.В., Брайцева О.А., Базанова Л.И., Пономарева В.В., Сулержицкий Л.Д. Особый тип катастрофических эксплозивных извержений - голоценовые субкальдерные извержения Хангар, Ходуткинский "маар", Бараний Амфитеатр (Камчатка) // Вулканология и сейсмология. 1996. № 2. С. 3-24.
   Annotation
The devestating explosive eruptions at Khangar (about 7000 14C BP), Khodutkinskiy "maar" (about 2800 14C BP), and Baraniy Amphitheater (about 1500 14C BP) are classified into a special type, subcaldera eruptions. They were analogues of caldera-forming eruptions by their dynamics, erupted volume (1.5-15 km^3), aspect, facies family, and the composition {from dacites to rhyolites) of the pyroclastics, but were not followed by the development of collapse calderas whose cavity volumes would fit the volume of discharge pyroclastics when converted to solid rock (magma). The discrepancy between a "caldera-like" aspect of the pyroclastics and the type of erupting vent can probably be explained by the greal depths of reservoirs of silicic magma which were "galvanized" when hot basaltic magma was injected into them. A subcaldera eruption usually began with a violent discharge of tephra, much greater in volume than the other volcanic products, to be followed by the formation of pyroclastic flows associated with pyrociastic surges. This sequence of events repeated itself several times during the eruption. No major explosion breccias were formed. Intensive ashfall involved areas of n * 10^4 ... n * 10^5 km^2, so that dated tephra beds have been excellent regional marker horizons. Subcaldera eruptions are hypothesized to have influenced the Earth's climate and are reflected as synchronous acid peaks in the Greenland glacier shield.
Мелекесцев И.В., Брайцева О.А., Двигало В.Н., Базанова Л.И. Исторические извержения Авачинского вулкана на Камчатке (попытка современной интерпретации и классификации для долгосрочного прогноза типа и параметров будущих извержений). Ч. I (1737-1909 гг.) // Вулканология и сейсмология. 1993. № 6. С. 13-27.
   Annotation
The old views on the style of the Avachinsky eruptions during 1737- 1909 have partially been revised based on new data obtained by the authors. We specified their types and geological-geomorphological effect and made an assessment of the related volcanic hazards. All the eruptions were merely explosive except for the effusive-explosive eruption of 1894-1895. The eruptions of 1737, 1779 and 1827 are referred to large for this historical eruptive stage, the rest (of 1772, 1851-1855, 1878, 1881, 1894-1895 and 1909) are regarded as small and moderate.
Мелекесцев И.В., Брайцева О.А., Двигало В.Н., Базанова Л.И. Исторические извержения Авачинского вулкана на Камчатке (попытка современной интерпретации и классификации для долгосрочного прогноза типа и параметров будущих извержений). Ч. II (1926-1991 гг.) // Вулканология и сейсмология. 1994. № 2. С. 3-23.
   Annotation
We have summed up and supplemented new data on the eruptions of 1926-1927, 1938 and 1945 plus added the description of the last eruption of the volcano in January 1991. Considering the dynamics of the eruptive activity of the Avachinsky volcano in 1737-1991 we have presented a classification for these eruptions. Also we made a forecast of the type and parameters of possible future eruption as well as estimated the volcanic hazard associated with it. Because of high degree of volcanic hazard in the SW and S sectors of the base of the volcano it is proposed to prohibit constructions of any kind in these areas.
Мелекесцев И.В., Брайцева О.А., Краевая Т.С., Сулержицкий Л.Д., Егорова И.А., Лупикина Е.Г. Применение комплексной методики для определения возраста четвертичных вулканических образований (на примере Камчатки) // Известия АН СССР. Серия геологическая. 1970. № 10. С. 149-152.
Мелекесцев И.В., Брайцева О.А., Пономарева В.В. Динамика активности вулканов Мутновский и Горелый в голоцене и вулканическая опасность для прилегающих районов (по данным тефрохронологических исследований) // Вулканология и сейсмология. 1987. № 3. С. 3-18.
Мелекесцев И.В., Брайцева О.А., Пономарева В.В., Базанова Л.И., Пинегина Т.К., Дирксен О.В. 0-650 гг. - этап сильнейшего природного катастрофизма нашей эры на Камчатке // Вулканология и сейсмология. 2003. Вып. 6. № 6. С. 3-23.
   Annotation
We have identified, and describe in this paper, a phase of multifactor natural catastrophism that has been the greatest during our era in Kamchatka, to be dated 0-650 A. D. Its chief components were. The last catastrophic eruptions to have occurred (a caldera-generating one at about 240 A. D., the pyroclastics volume being 18-19 km3 and a subcaldera one around 600 A. D. with the volume of lava and pyroclastics 9.5-10.5 km3) which were followed by irreversible relief changes over areas of hundreds of square kilometers and have affected rather injuriously many other environmental components. An exceptionally intensive activity of the other volcanoes (at least 75-80% of all active and potebtially active Kamchatkan volcanoes were erupting, tens of large and catastrophic eruptions occurred). Regional catastrophic and large ashfalls. A sharp, large-amplitude (between 1.5-2 and 12-15 m) tectonic uplift of various blocks in Kamchatka. Large earthquakes accompanied by large-volume rockfalls, landslides, large and frequent tsunamis. The catastrophic events of that time are argued to have been part of a worldwide phase of natural catastrophism that we hypothesize to have occurred at the beginning of our era.
Мелекесцев И.В., Брайцева О.А., Пономарева В.В., Сулержицкий Л.Д. Возраст и динамика формирования действующих вулканов Курило-Камчатской области // Известия АН СССР. Серия геологическая. 1990. Т. 4. С. 17-31.
   Annotation
Theories are presented about the time of origin, dynamics and formation mechanism of active volcanoes in the Kuril-Kamchatka zone during the Late Pleistocene-Holocene period. The study was based on more than 500 radiocarbon dates and the results of geological, geomorphological, tephrochronological and isotopic geochronological research. It is noted that there are different rhythms in the activity of the volcanoes and in the mechanisms and rates of formation of the volcanic structures. Periods of synchronous activity of the volcanoes on Kamchatka and the Kuril islands, and apparently, in other volcanic areas are identified, suggesting their global nature. The concept of "active volcano' is discussed. -P.Cooke
Мелекесцев И.В., Брайцева О.А., Пономарева В.В., Сулержицкий Л.Д. Катастрофические кальдерообразующие извержения вулкана Ксудач в голоцене // Вулканология и сейсмология. 1995. № 4-5. С. 28-53.
   Annotation
Four Plinian eruptions from Ksudach volcano ha' been reconstructed and dated by the 14C method. Three collapse calderas formed as a resu of these eruptions: KSi and caldera V 1700-1800 yrs ago; KS2 + KS3 and caldera IV 6000- 6100 yrs ago; KS4 and caldera III 8700-8800 yrs ago. KSi was the most voluminous eruptio with 18-19 km of pyroclastics and column height reaching 23 km. The volume of produci of KS2 + KS3 was 10-11 km3 and that of KS4, at least 1.5-1.7 km3. Sizes of calderas wer as follows: V - 4 X 6.5 km, IV - 5x5 km, III - presumably 2-3 km across. The juveni pyroclastics were supplied during eruptions rather rhythmically. Each rhythm began wil tephra ejection and completed with the formation of pyroclastic flows. The composition < products varied from andesited to rhyodacites: KS2 and KS4 - andesites dominated, KS3 - dacites and rhyodacites, and KSi - rhyodacites. It is possible that "the mechanism triggering onsets of all caldera-forming eruptions was the intrusion of very hot fresh magma of basi composition and its mixing with less hotter acid magma in the magma chamber existe previously. The eruptions, in accordance with their scales, may have had an impact on clima and ozone layer of the Earth. It is likely that the large acidity peaks in Greenland ice cor* result from these eruptions.