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On April 10, 2023, the strongest eruption of the Young Shiveluch volcano ( Russia, Kamchatka Peninsula) in the last 60 years occurred. The eruption was preceded by a long seismic activity since the end of July 2022. Earthquakes during this period were mainly long-period, occurring in the area of the extruding extrusive dome. The paper describes the grouping of earthquakes into families according to the similarity of waveforms, and their comparison with the activity of the Young Shiveluch volcano. For the period of monotonic, with a constant rate, dome extrusion, when the pressure in the channel was constant, earthquakes were grouped into long-term families. The period before the culmination phase is characterized by a greater number of families, which is interpreted as an indicator of instability of the environment. Such an increase in the number of earthquake families allows us to predict more accurately the beginning of the culmintion phase of eruptions of andesitic Young Shiveluch volcano.

In 2022, volcanic activity in the Kuril Islands was increased. Alaid (Atlasov Island), Ebeko, Chikurachki (Paramushir Island) and Chirinkotan volcanoes (Chirinkotan Island, Northern Kuriles) were erupting. A summit effusive-explosive eruption occurred on the Alaid volcano from September till December: two lava flows 2.6 and 1 km long erupted along the southern slope of the volcano and at least 15 explosions occurred to a height of 2.5 to 6 km a.s.l. Ebeko Volcano, which has been dormant since December 2021, in June 2022 resumed the intense volcanic activity characteristic for recent years, characterized by frequent ash emissions. Over 7 months of volcano activity (from June till December 2022) more than 600 ash ejections were recorded, 253 of which were at a height of 3 or more km above sea level). By July, explosive activity increased sharply – 174 events were recorded (51 of them at a height of 3 or more km a.s.l.), which became the maximum value for the entire period of video observations carried out since October 2017. The Chikurachki volcano was characterized by an increased activity, in the period from January till October, at least 5 episodes of explosive activity were observed. Both single ejections and series of explosions to a height of 2–5 km a.s.l., as well as periods of relatively quiet emission of ash-gas mixture of various intensity were observed. On March 22, a single weak ash ejection (3 km a.s.l.) was recorded at the Chirinkotan volcano.

The results of field work at the active volcanoes Alaid and Ebeko, located in the northern part of the Kuril Island Arc, carried out in June−July 2023 are described. At Alaid volcano, the first survey of lava flows and fumarolic mineralization products of the 2022 eruption was carried out at various heights, including the summit, and geological sampling of the Taketomi cone and eruptive rocks of the eastern coast of Atlas Island was also conducted. An aerial photo and area temperature survey of the area occupied by the products of the 2022 eruption was undertaken at the summit of Alaid volcano using a high-precision quadrocopter equipped with a thermal imaging camera. At Ebeko volcano, mineral samples were taken from fumarole sites located on its eastern slope, and an aerial photo and area temperature survey were done.

The eruption of the unique Taketomi side volcano, located on Atlasov Islandin the northern part of the Kuril island arc, started underwater and ended on land. It happened before people’s eyes and was essentially the formation of a new volcano. The newly formed side volcano was studied by famous Japanese scientists in 1933–1936, and from 1946 to the present day by Soviet and Russian researchers. The Taketomi side volcano continues to amaze with its landscapes and is actively visited by numerous tourists. Unfortunately, there is still not a single publication about people who have made a significant contribution to the study of this side volcano. This work is the first attempt to tell about them. In addition, based on available photographs, the destruction of the Taketomivolcano edifice from 1950s to 2020 is shown and, for the first time, existing inconsistencies cited in various publications describing the eruption of the volcano are highlighted.

Chikurachki volcano located in the southern part of Paramushir Island (Northern Kuriles) was in a state of increased activity from January to October 2022. According to satellite data and the results of visual observations, at least 5 episodes of explosive activity, lasting from 2 to 8 days: January 30 – February 03, June 23–24, June 30 – 01 July, August 21 – September 02, October 13–20 were recorded. All observed events were similar to previous volcanic eruptions in their nature and duration, among which weak and moderate vulcanian eruptions prevailed: both single emissions and series of explosions to a height of 2–5 km a.s.l., as well as periods of relatively calm ash and gas mixture emission of various intensity were observed. Ash plumes and clouds spread mainly in the east, south, southeast, northeast and southwest directions, their length reached 790 km, and the area was 25 408 km2 (15 October, 2022).

The data on volcanic activity in the Kuril Islands during 2020–2021 are presented. The activity of Ebeko (Paramushir Island), Chirinkotan (Chirinkotan Island) and Sarychev Peak (Matua Island) volcanoes is characterized on the basis of satellite data and results of visual observations. In 2020–2021 a weak (to moderate) explosive eruption (VEI 1-2), which has begun in autumn 2016, continued on Ebeko volcano. During the period under review, at least 1169 emissions were recorded at a height of 1.5–3 (up to 5) km a.s.l. In the interval from May till July, a sharp increase in the explosive activity of the volcano was noted, during this time more than half of the total number of explosions occurred: 2020 – 298 out of 558, 2021 – 344 out of 611. The ashfalls of varying intensity were periodically observed in Severo-Kurilsk. The active phase of the eruption has ended in December 2021, only 2 weak explosions occurred. A moderate (VEI 2) explosive eruption took place on Chirinkotan volcano from August 8 to August 23, 2021. At least 12 volcanic explosions were recorded at a height of 1.5 to 4.5 km a.s.l. An effusive eruption was observed on the Sarychev Peak volcano from December 2020 till February 2021: the crater was filled with lava, after which it erupted along the northeastern slope of the edifice. In 2021, the activity of the volcano was characterized by manifestations of several episodes of an explosive nature: on June 29, July 1, August 6, and November 26, single, relatively weak ejections to a height of about 2.2–3 km a.s.l. were recorded (VEI 2).

The methods of remote sensing of the Earth, due to their efficiency and information content, are widely used to research vegetation dynamics and monitor volcanic activity. The purpose of this work is to research the dynamics of the mud volcanic landscapes and vegetation cover of the Yuzhno-Sakhalinsk mud volcano, as well as its eruption, using Earth remote sensing data. The total area of the study area is 11.5 km2. The work was done in QGIS 3.16 program using Sentinel-2B satellite image, images from Google Earth program and graphic maps of the study area created by O.A. Melnikov and V.V. Ershov. An updated large-scale schematic map of the Yuzhno-Sakhalinsk mud volcano has been created, displaying all known volcanic eruption fields over the last 70 years, modern and extinct eruptive centers. A semi-automatic classification of the Sentinel-2B satellite image was carried out using the methods of supervised and unsupervised classification using the Semi-Automatic Classification Plugin module. Based on the results of two types of classification, the areas of vegetation classes of the study area were calculated and two maps of the vegetation cover of the Yuzhno-Sakhalinsk mud volcano were created on a scale of 1 : 50 000 as of 2018. The maps need to be refined, but they can already be used to analyze the dynamics of the vegetation cover of the study area. In our opinion, it is more expedient to apply unsupervised classification before conducting a field survey of the area of interest, and supervised classification after. The practical significance of satellite monitoring of the Yuzhno-Sakhalinsk mud volcano lies in the ability to quickly monitor its activity, assess the recreational load and study the impact of volcano activity on vegetation and the landscape as a whole.

The paper reports the appearance of a new crater lake on the Ebeko volcano. There has been no thermal lake within the Northern Crater since mid-2006. The last eruption began on October 19, 2016 and ended on November 19, 2021. The pyroclastic cone of the new crater, which was named Korbut Crater, rose within the Northern Crater. There was strong fumarolic activity in the Korbut crater, which persists today. The lake in the still erupting Korbut crater was first recorded by the authors on a satellite image from September 17, 2021; already on a satellite image from September 25, the crater was dry again. After the end of the Ebeko eruption, due to the intensive flow of fluid with bottom fumaroles and due to a large amount of meteoric precipitation, a lake was formed in the Korbut crater (Sentinel 2 satellite data of December 11, 2021). In January 2022, the authors examined the Korbut crater: the diameters of the lake were 61 and 80 m (latitude and meridian, respectively), the mirror area was 4.5 thousand m2, and water temperature was 43°C. A brief literature review of the existence of thermal lakes on the northern flank of the Ebeko volcano is given.

The article considers a short-term moderate explosive eruption of Chikurachki volcano (Paramushir Isl.) on the basis of satellite data. In the period from January 30 to February 3, 2022, at least 8 steam-gas and ash emissions to a height of 2.5–5 km a.s.l. were recorded. Ash plumes and clouds spread mainly in the south-western, western, southern, and south-eastern directions at a distance up to 250 km from the volcano. Its parameters were similar to the previous explosive eruptions of Chikurachki volcano. Due to high frequency of moderate explosive eruptions of Chikurachki volcano in recent years, when ash clouds rise to a height up to 7.5 km a.s.l. and ash plumes are formed that can spread for several hundred kilometers, the volcano poses a potential hazard to international and local airlines.

This communication, based on satellite data and the results of visual observations, considers the main features of the activity of Chirinkotan and Sarychev Peak volcanoes in 2021. In the period from August 8 to 23, 2021, a moderate explosive eruption of Chirinkotan volcano took place. During this time, 11 volcanic explosions were recorded at an altitude of 1.5 to 4.5 km a.s.l. The parameters of the 2021 eruption were similar to previous eruptions in 2013–2015, 2016, 2017. At Sarychev Peak volcano on June 29, July 1, August 6 and November 26 of 2021 single relatively weak ejections to an altitude of about 2.2–3 km a.s.l. were recorded. Current activity of the volcano is associated with a recent effusive eruption that has taken place from December 2020 to February 2021, in which result a crater and mouth of the volcano turned out to be sealed with lava.

This publication, based on remote sensing data, examines the features of the effusive eruption of the Sarychev Peak volcano (Matua Isl., the Central Kuril Islands), which took place from December 2020 till February 2021. On the basis of the analysis of the Sentinel satellite data, it was established that starting from December 2020, the crater of the Sarychev Peak volcano began to fill with lava. As of January 18, 2021, it was completely filled, then lava outpouring through a fissure in the north-northwest part began. A lava flow (length 2 km, width 80–90 m) descended along the bottom of the valley, which cuts the northwestern slope of the volcanic cone. The outpouring of lava was completed by February 7, 2021. The effusive eruption of the Sarychev Peak volcano in 2020–2021 is atypical for the modern stage of eruptive history, characterized mainly by explosive and explosive-effusive type of eruptions.

On February 18, 2021, a flank eruption started on the north-western slope of the Klyuchevskoy Volcano (Kamchatka, Russia). Cinder cone was formed at the altitude of 2 850 m above sea level, from which a lava flow was spreading north-west. Having moved 1.2 km downslope, the lava flow entered the Ehrmann Glacier, which resulted in the formation of huge mud-stone flows. The latter made their way further north-east along the Kruten’kaya River bed and reached the length of about 30 km. The eruption brought onto the surface high-aluminous basaltic andesites typical of the Klyuchevskoy Volcano. By March 21, the flank eruption ended. It has been named after G.S. Gorshkov, associate member of USSR Academy of Science, famous Russian volcanologist.

Извержение вулкана Кизимен в 2011-2012 гг. характеризовалось устойчивым, почти равномерным выжиманием вязкого лавового потока объемом 0.3 км³. Формирование лавового потока сопровождалось возникновением квазипериодических землетрясений режима «drumbeats» с энергетическими классами Ks

The Ebeko volcano located in the northern part of Paramushir Island (Northern Kuril Islands) is currently the most active volcano of the Kuril Island arc: since 2016, next explosive eruption has continued, proceeding in the form of regular ash-gas explosions of moderate force. In the period from January 2018 to October of 2020 a total of at least 1834 emissions were recorded (during daylight hours and under good weather conditions). In May–July 2020, the intensification of the eruptive activity of the volcano was observed, that manifested in a sharp increase of the emissions frequency and height. During this period, 296 emissions were recorded, 90 of which were at an altitude of 3 km or more.

Objective: to describe the results of the joint monitoring and diversified treatment of oncologists and dermatologists those patient with multiple recurrent melanoma who received over a long period a targeted anti-cancer therapy, which was complicated by side-effect as widespread acneform rush, resistant to traditional treatment. Patient A., born in 1988, was followed up and got a treatment more than 2 years in oncology out-patient clinic diagnosed with “Melanoma of the front surface of the left leg T2bN0M0 IIA”. Subsequently, the patient was verified metastasis in the inginal lymph nodes, in the soft tissues of the hips, to liver. Acute adverse reaction has developed in a short time after getting the anti-tumor target therapy as generalized acneform rush and itching of the skin. Skin symptoms accompanied by pronounced psychological and emotional stress, therefore, dermatologists have been invited to provide additional medical assistance to this patient. Due to the fact that subsequent traditional anti-acne algorithms of topical and oral treatment was not such effective, there was made a decision to use an alternative supporting external therapy, which did not have similar examples of usage previously. Results. External application of tacrolimus ointment in combination with other drugs and then as a mono-therapy, allows us in a rather short period achieve a stable and pronounced regression of skin pathological lesions, to return to the previously cancelled initial drug dose of the anti-tumor target therapy, to change significantly components of the patient’s quality of life. Conclusion. The search for additional and alternative treatment approaches for similar patients, as in our case, remains relevant for specialists and patients themselves. This case is an example of alternative approach to the tacrolimus topical application in patient with drug-mediated acneform rush.

The article is a review of literature data on the stages, classifications, pathological conditions during the eruption of the lower third molars in humans. The authors analyzed the established knowledge about clinical and morphological changes at various stages of eruption of the lower third molars, studied new data describing the pathogenetic, histological and biochemical features of their development, packaging, movement to the occlusal plane. The literature review helped to identify a series of current trends that define a number of key hypotheses that summarize the accumulated material and indicate different opinions on the topic under study, which confirms the prospects and relevance of continuing research.

The article is a review of literature data on the stages, classifications, pathological conditions during the eruption of the lower third molars in humans. The authors analyzed the established knowledge about clinical and morphological changes at various stages of eruption of the lower third molars, studied new data describing the pathogenetic, histological and biochemical features of their development, packaging, movement to the occlusal plane. The literature review helped to identify a series of current trends that define a number of key hypotheses that summarize the accumulated material and indicate different opinions on the topic under study, which confirms the prospects and relevance of continuing research.