Journal of Volcanology and Seismology最新文献

{"title":"Comparison between the Focal Mechanisms of Large Volcano-Tectonic Earthquakes Occurring at Shiveluch, Klyuchevskoi, and Plosky Tolbachik Volcanoes","authors":"M. V. Lemzikov","doi":"10.1134/S0742046326700089","DOIUrl":"10.1134/S0742046326700089","url":null,"abstract":"<p>This paper presents focal mechanism solutions for large volcano-tectonic earthquakes (VTE) at three Kamchatka volcanoes: Shiveluch, Klyuchevskoi, and Plosky Tolbachik followed by comparison between the results in order to distinguish between the principal and the auxiliary nodal plane. The data set included digital seismograms of VTEs not below energy class 7 and depths of focus between zero and 30 km. The solutions were based on the polarities of P-wave first motions using the FPFIT program algorithm. Comparison between the strikes of the first and second nodal planes for large VTEs on each of the three volcanoes has not been sufficient to find the principal plane. Comparison between the dip angles of the first and second nodal planes for large VTEs on each of the three volcanoes and comparison of directions of motion on the first and second planes has enabled us to identify the first nodal plane as the principal and the second nodal plane as the auxiliary.</p>","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"20 2","pages":"127 - 135"},"PeriodicalIF":0.9,"publicationDate":"2026-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147738695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermohydrodynamic Modeling of Well Operation of Chloride–Calcium Lithium-Bearing Brines","authors":"A. V. Kiryukhin,&nbsp;A. V. Sergeeva,&nbsp;A. G. Vakhromeev,&nbsp;M. A. Danilova,&nbsp;A. V. Gladyshkina,&nbsp;E. V. Kartasheva,&nbsp;M. A. Nazarova,&nbsp;A. A. Kuzmina,&nbsp;A. P. Gorokhov,&nbsp;A. S. Tsoy,&nbsp;V. V. Lukyanov","doi":"10.1134/S0742046326700053","DOIUrl":"10.1134/S0742046326700053","url":null,"abstract":"<p>Highly concentrated Cl–Mg–Ca brines with a salinity of up to 700 g/L of the Siberian Platform contain economic concentrations of valuable strategically important elements (Li), but are challenged due to salt deposition in the wellbore. To solve this task, we used the TOUGH2 family software for modeling the multiphase non-isothermal geofiltration in a fractured-porous medium taking into account the chemical interaction of phases, which was supplemented by an EWASG-CACL2 state module for the description (density, viscosity, and enthalpy) of the CaCl₂ brine with a mass concentration ranging from 0.25 to the maximum saturation (&gt;0.6) at temperatures of 0–50°C. The CaCl₂ brine was extracted by a single production well with a submersible pump from the target reservoir in TOUGH2-EWASG-CACL2 modeling. The filtration-capacity and thermophysical parameters, as well as the geometry of the target reservoir and the well, were given as synthetic in a range of possible change according to geological exploration data in the south of the Siberian Platform. A potential transition mechanism of the well to stable operation mode is identified as a result of the production well modeling. The first operation stage exhibits a simultaneous growth (up to 86%, antarcticite, CaCl₂⋅6H₂O) and warming (from 6 to 19°C) of the wellhead and the next stage is characterized by fast dissolution of the first stage salt plug and transition to stable operation mode due to self-heating and a temperature increase. The resource potential for ensuring production is shown as a result of modeling of inflows from the target reservoir regardless of hydrodynamic conditions at the outer boundary of the target reservoir. The geological processes, which could lead to the formation of highly concentrated brines and the role of volcanism in their formation, are considered.</p>","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"20 2","pages":"175 - 189"},"PeriodicalIF":0.9,"publicationDate":"2026-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147738597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Magmatic System of Shiveluch Volcano from Seismic Data with Geomechanical Interpretation","authors":"A. V. Kiryukhin,&nbsp;O. V. Bergal-Kuvikas,&nbsp;M. V. Lemzikov","doi":"10.1134/S0742046326700077","DOIUrl":"10.1134/S0742046326700077","url":null,"abstract":"<p>Magmatic activity beneath Shiveluch volcano in 2000–2023 was manifested in the injection of dykes and sills (detected by the Frac-Digger method) with increased concentration in the depth ranges from –1 to +1 km, and from –3 to –2.5 km and NNE striking of dykes toward to Klyuchevskoy volcano. Further seismic lineament analysis reveals a zone of NNE striking trans-volcanic dykes that include more than a half of the total 198K micro-earthquakes recorded in North Group of Volcanoes (NGV), extended under volcanoes into 120 km length (dip angle 79 degrees and dip azimuth of 299°). A regional deep seismogenic fault beneath (dip angle 81 degrees and dip azimuth of 296°) at open mode NF geomechanical conditions, and enormous cold spring discharge (12.3 m³/s) are also hosted in this zone, thus, along with other geological and petrological evidences, it may be defined as NGV rift zone. In many cases (Oct. 28, 2010, Dec. 03, 2013, Dec. 30, 2018, Apr. 10, 2023) paroxysmal eruptions of Shiveluch volcano were preceded by seismic activity in the deep magma chamber of Klyuchevskoy volcano, that’s supposed to be source of trans-volcanic dykes originating from Klyuchevskoy to Shiveluch along NGV rift zone.</p>","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"20 2","pages":"136 - 163"},"PeriodicalIF":0.9,"publicationDate":"2026-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147738696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geothermal Resources and Thermal Capacity of Igneous Intrusions of the Mutnovsky Volcano: Modeling and Prospects for Expansion of the Mutnovsky Geothermal Power Stations","authors":"P. S. Sakharov,&nbsp;M. O. Sakharova,&nbsp;K. A. Novoselov","doi":"10.1134/S0742046326700016","DOIUrl":"10.1134/S0742046326700016","url":null,"abstract":"<p>The development of a concept for increasing the power capacity of the existing Mutnovsky geothermal power stations will ensure reliable energy supply to Petropavlovsk-Kamchatsky and create conditions for the development of tourism and the region’s economy. The implementation of the project will provide energy to the city using its own geothermal potential of Kamchatka krai, help preserve its unique nature without resorting to fossil fuels that have a negative impact on the environment, and create favorable conditions for further economic growth and social stability. To cover all needs, as well as the development of tourist infrastructure, it is necessary to increase the established power capacity to 300 MW. In order to achieve these values, it is first necessary to analyze the distribution of the gethermal energy of igneous intrusions, which will make it possible to assess the undiscovered potential of the Mutnovsky geothermal field.</p>","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"20 2","pages":"219 - 223"},"PeriodicalIF":0.9,"publicationDate":"2026-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147738854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Layered-Blocky Structure of the Pauzhetka Geothermal Field, Southern Kamchatka","authors":"S. O. Feofilaktov,&nbsp;S. N. Rychagov,&nbsp;I. A. Nuzhdaev,&nbsp;Yu. Yu. Bukatov,&nbsp;I. F. Abkadyrov","doi":"10.1134/S0742046326700119","DOIUrl":"10.1134/S0742046326700119","url":null,"abstract":"<p>Based on integrated geological and structural–geophysical studies, we show that the discharge of thermal waters at the Pauzhetka geothermal field is confined to circular tectono-magmatic blocks. We have resolved the essential issue concerning the source of thermal supply to the Pauzhetka geothermal system: a horizon of higher conductivity has been identified at depths between 3.5 and 8 km between the crystalline and the terrigenous basement for the heat flow which is ascending from beneath the Kambalny volcanic range. These results allow us to pass to the consideration of the next problem, namely, a study of the geological structure between the source of thermal supply and the region of discharge for vapor-rich hydrothermal fluids.</p>","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"20 2","pages":"81 - 99"},"PeriodicalIF":0.9,"publicationDate":"2026-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147738582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Indicator Signs of Hydrothermal Processes in the Rocks of Oil and Gas Complexes","authors":"M. A. Tugarova,&nbsp;V. S. Stepanova,&nbsp;A. E. Gavrilov","doi":"10.1134/S0742046326700028","DOIUrl":"10.1134/S0742046326700028","url":null,"abstract":"<p>Hydrothermal superimposed processes in sedimentary complexes are a well-known process. They manifest themselves in changes of rock composition (both mineral and organic) and their structural characteristics. From the point of view of the rock properties as elements of oil and gas-bearing complexes, this means a possible change in oil and gas generating and reservoir properties, as well as a change in the phase composition of hydrocarbons. In oil and gas geology hydrothermal processes began to be taken into account relatively recently, when their role in the formation of the properties of reservoirs and oil and gas source rocks became obvious. Secondary superimposed carbonatization is considered as the most widespread process and its hydrothermal nature is substantiated.</p>","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"20 2","pages":"211 - 218"},"PeriodicalIF":0.9,"publicationDate":"2026-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147738852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Formation Conditions and Geothermal Resources of the Paratunka Geothermal Fields","authors":"A. V. Kiryukhin,&nbsp;N. B. Zhuravlev,&nbsp;S. V. Alekseenko,&nbsp;S. L. Elistratov,&nbsp;D. N. Burnaykin","doi":"10.1134/S0742046326700041","DOIUrl":"10.1134/S0742046326700041","url":null,"abstract":"<p>The Paratunka and Verkhny Paratunsky deposits (Kamchatka, Russia) are examples of worldwide widespread low-temperature nitrogen (LT N₂) geothermal systems. The Paratunka geothermal fields are located 15 km apart, composed of the Eocene–Quaternary volcanic rocks, and characterized by shallow permeable reservoirs with deep conductive roots inherited from extinct volcanoes with circulating SO₄–Na nitrogen thermal waters of 60‒90°C. The Paratunka reservoir has a 60-year history of intense exploitation (150‒250 kg/s), whereas the Verkhny Paratunsky reservoir is just being commissioned. A 3D numerical thermohydrodynamic model is developed for the Verkhny Paratunsky and Paratunka LT N₂ geothermal system (Kiryukhin et al., 2025), which suggests that the top of the pre-Cretaceous basement is permeable, whereas the roots of extinct volcanoes are the channels for thermal fluid upflows and thermal spring discharge. This numerical model also includes a water recharge area from adjacent highlands. The feasibility of exploiting a potential deep reservoir confined to the structural surface of the pre-Cretaceous basement top (an area of 270 km²) for heat supply and using the binary technologies for electric power generation is confirmed. According to numerical modeling results, the possible initial power generation is estimated at 32.3 MWe.</p>","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"20 2","pages":"190 - 203"},"PeriodicalIF":0.9,"publicationDate":"2026-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147738853","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Earthquake-Induced Deformations in the Zoroastrian Temple of Kurgantepa, Samarkand Region","authors":"A. A. Anarbaev,&nbsp;A. M. Korzhenkov,&nbsp;A. N. Sandibaev,&nbsp;M. M. Saidov,&nbsp;L. A. Korzhenkova,&nbsp;A. A. Sentsov","doi":"10.1134/S0742046325700630","DOIUrl":"10.1134/S0742046325700630","url":null,"abstract":"<p>Kurgantepa is a multilayered ancient settlement lying in the Urgut Area of the Samarkand Region. It consists of ruins of the center of a rustak (rural district) in the Sogd during early medieval times. The settlement is identified to be the same as the center of rustak Sanjarfagn. It was shown that the population center which was formerly in the territory of the modern Kurgantepa hill is the classic threefold structure of a medieval city: the ark (the citadel), shakhristan (the inner city), and rabad (the suburbs). The archeological excavations which were carried out there in 2022–2024 revealed architectural remains interpreted as a Zoroastrian temple. Its monumental structure, the presence of columns, decorated walls, and the altar, as well as the ritual orientation of internal furnishings, all point to a sacral destination of the building. One of the more interesting features in the temple consists in traces of destruction whose morphology indicates a strong seismic excitation. The study of these deformations, including failures and displacements of fragments of structural elements and the collapses of arch systems, provide data from which to reconstruct the parameters of a possible mediaeval earthquake (local seismic intensity and the direction to the epicentral zone), as well as to expand our knowledge of the region’s earthquake history.</p>","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"20 1","pages":"51 - 65"},"PeriodicalIF":0.9,"publicationDate":"2026-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147336263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dacitic Ash from the Andesitic Sheveluch Volcano, Kamchatka","authors":"M. L. Tolstykh,&nbsp;D. V. Melnikov,&nbsp;A. D. Babansky","doi":"10.1134/S0742046325700642","DOIUrl":"10.1134/S0742046325700642","url":null,"abstract":"<p>Sheveluch Volcano is one of the most productive volcanoes in Kamchatka, characterized during the Holocene by alternating periods of predominantly extrusive and explosive activity. New data on the volumetric parameters of fine ash emissions have been obtained, indicating that the mass of erupted material of dacitic composition during a single moderate-strength eruption can exceed 2 million tons. In those years when gas and ash cloud eruptions were particularly frequent (sometimes more than twenty per month), the total mass of fine dacitic ash can be comparable to the annual discharge of andesitic material (extrusive lavas and tephra), providing a new perspective on the genesis of andesites.</p>","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"20 1","pages":"31 - 50"},"PeriodicalIF":0.9,"publicationDate":"2026-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147336136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Macrocomponent Composition of Hyper-Acid Volcanic Thermal Waters on the Kuril Islands","authors":"E. G. Kalacheva","doi":"10.1134/S0742046325700654","DOIUrl":"10.1134/S0742046325700654","url":null,"abstract":"<p>The results of multiyear observations were used to characterize the volcanic hydrothermal systems containing horizons of hyper-acid waters of SO₄–Cl or Cl–SO₄ composition (ASC-waters) on five islands (Paramushir, Shiashkotan, Urup, Iturup, and Kunashir). We used physicochemical parameters and the macrocomponent composition of the thermal waters to develop an additional classification. Depending on the conditions of percolation and discharge we identified three groups of ASC waters: (a) classical of Al–Fe–SO₄–Cl composition, (b) those diluted with groundwater of Ca–Cl–SO₄(SO₄–Cl) composition, and (c) those mixed with deep thermal waters of Na–Cl–SO₄ composition. These groups differ in pH, temperature, salinity, and in the SO₄/Cl/F and (Na + K)/(Ca + Mg)/(Al + Fe) ratios. The first group of classical hyper-acid waters of SO₄–Cl composition includes the springs at Ebeko Volcano (Paramushir) and at Baransky Volcano (Iturup) whose cation compositions are dominated by Al and Fe. The second group, which is diluted with cold groundwater, includes the thermal waters discharged on the slopes of Sinarka Volcano (Shiashkotan) and Berg Volcano (Kunashir). The third group which is mixed with sodium chloride waters includes the springs at Mendeleev and Golovnin volcanoes (Kunashir). The cation composition of all ASC waters studied on the Kuril Islands is equivalent to less than 10 grams of rock dissolved in one liter of water.</p>","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"20 1","pages":"15 - 30"},"PeriodicalIF":0.9,"publicationDate":"2026-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147336096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}