Приводятся данные о состоянии вулкана Эбеко в 2012–2013 гг.: фумарольная активность, состав газов, гидротермальные взрывы на Юго-Восточном фумарольном поле. Обсуждаются причины гидротермальных взрывов. Дается оценка активности вулкана.

Abstract—This paper discusses patterns that are observable in the alteration of effusive rocks that were discharged by Baranskii Volcano (central Iturup Island) under the action of sulfate chloride as well as acidic and ultra-acidic water (in the Kipyashchaya Rechka thermal brook). We acquired data on changes in the chemical and mineralogic composition of the rocks, structural features, porosity, and petrophysical properties. The dynamics of leaching and the leaching phase in a flowing acidic (ultra-acidic) geothermal environment are described. We note that the mechanism that is responsible for hydrogen sulfate leaching of rocks at the ground surface may be largely analogous to the generation of secondary quartzites (mono-quartzites) in the zones of ascending acidic gas flows above small gabbro–diorite and diorite intrusions.

We provide new evidence that bears on the geological structure, history of evolution, and structural setting for the Bol’shoi Semyachik Volcanic Massif in Kamchatka. The new Ar–Ar results for dating of volcanic rocks allowed significant advances in updating the stratigraphy and history of the evolution of the area of study. We discuss the distribution of centers of volcanic and hydrothermal activity in the Bol’shoi Semyachik Massif area. The distribution suggests that the volcanism in the area is progressively migrating south eastward. It is shown that all thermal occurrences, such as sets of steam jets, thermal springs, and heated patches (evidence of present-day activity), are also displaced into the southeastern part of the massif. It was concluded that these patterns are not accidental, but are controlled by dipping magma-conducting and fluid-conducting faults that bound a major basement low on the southeast. The low had been identified earlier from geophysical observations. The dip gives the result that the magma and fluids rise to the surface and simultaneously deviate eastward and southeastward, where the youngest occurrences of volcanic activity and present-day thermal features are found today.

Предложен новый вариант геолого-геоморфологического строения и истории формирования массива Вулканологов (МВ), расположенного в Командорской котловине Берингова моря. Основой для него послужили батиметрическая карта, созданная в 2009 г. по результатам многолучевого эхолотирования с борта экспедиционного судна «Зонне», и частично ревизованные материалы более ранних геолого-геофизических исследований этого района. Показано, что МВ перед началом формирования вулкана Пийпа был кардинально преобразован и разрушен катастрофическими магмо-тектоническими и обвально-взрывными процессами. Определены параметры МВ, активного вулкана Пийпа и открытого автором магматического суперпотока, оценен их возраст.

This paper presents results of study of the 2012-2013 Tolbachik fissure eruption on the basis of remote sensing
techniques.
We have calculated values of vertical displacements, lava thickness and the volume of the erupted lava. Values of
vertical displacements were estimated using a series of
radar interferometric pairs for the Tolbachik eruption zone.
These pairs correspond to the concluding phase of the erupti
on, when vertical displacements were relatively small.
Vertical displacements were calculated for parts of lava fields with coherence value over 0,4. The obtained values of
vertical displacement are typical for subsidence caused by cooling lava flows. The maximum value of subsidence is
27 cm for 24 days. The calculation of lava thickness was based on comparison of multitemporal DEMs. Height profiles measured by geodetic GPS receivers during fieldwork in August 2013 were used to estimate the quality of DEMs, derived from satellite imagery: freely available SRTM, SRTM-X, ASTER GDEM and the DEMs calculated at RDC ScanEx from two stereopairs of SPOT6 images (of 18.07.2013 and 11.10.2013). The RMS error for heights of SRTM-X and
SPOT 6 in relation to GPS data is within ±5 m. This enables to estimate the total thickness of new lava fields on the
basis of height differences between SRTM-X and SPOT 6 DEMs. Both SPOT 6 DEMs were used together to eliminate errors caused by clouds and snow. The maximum lava thickness is over 80 m. The volume of the erupted lava is 0,521±0,25 km3.

В сообщении приведены новые данные о распространении и возрастах отложений обломочных лавин на южном подножии вулкана Шивелуч, полученные в результате полевых исследований 2011–2013 гг. Все лавины распространились на расстояние более 25 км от современного кратера. Впервые на южном подножии установлены отложения двух раннеголоценовых лавин, наиболее крупных за послеледниковое время.