Journal of Volcanology and Seismology最新文献

{"title":"Hydrogeological Conditions and Discharge Regime of the Verkhne Paratunsky Thermal Springs","authors":"N. B. Zhuravlev,&nbsp;A. V. Kiryukhin,&nbsp;P. O. Voronin,&nbsp;A. V. Sergeeva,&nbsp;Bo Feng,&nbsp;I. A. Nuzhdaev,&nbsp;Siqing He","doi":"10.1134/S0742046326700090","DOIUrl":"10.1134/S0742046326700090","url":null,"abstract":"<p>The Verkhne Paratunsky thermal springs are the large natural discharge zone of the Verkhne Paratunsky low-temperature nitrogen geothermal field (Kamchatka, Russia). Their hydrothermal and hydrogeochemical history, as well as their discharge conditions, were analyzed based on previous (1966–1996) and renewed (2024–2025) monitoring of the spring regime. The experimental and operational releases at the Verkhne Paratunsky geothermal field in 1975–1984 led to a significant change in the discharge parameters: a decrease in the maximum temperature of the springs from 67 to 46°C and a decrease in the total mineralization (a 2‒2.5-fold decrease in Cl and SO₄), while the flow rates of the entrained springs (3.5‒8.2 L/s) are close to the initial values before the start of tests. The flow tests carried out at the Verkhne Paratunsky geothermal field in 1975‒1984 led to a significant change in the discharge parameters: a decrease in the maximum temperature of the main springs from 70 to 30–35°C, a decrease in the flow rate from 7.7 to 2.9 kg/s, and a decrease in the mineralization by two times or more (all in average annual terms). By 2025, the flow rates of the main captured springs had recovered to 5 kg/s, the temperature to 49°C, and the mineralization to 50–65% of the initial value. Using the chloride tracer method, an updated assessment of the deep component of the total discharge of the Verkhne Paratunsky springs was estimated varying from 6.3 kg/s (March) to 21.9 kg/s (May) in the annual cycle.</p>","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"20 2","pages":"114 - 126"},"PeriodicalIF":0.9,"publicationDate":"2026-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147738596","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":"Geomechanical Conditions of Seismic, Volcanic, and Hydrothermal Activity in Kamchatka","authors":"A. V. Kiryukhin,&nbsp;A. V. Solomatin","doi":"10.1134/S0742046326700120","DOIUrl":"10.1134/S0742046326700120","url":null,"abstract":"<p>The distribution and orientation of regional seismogenic faults of Kamchatka are calculated by Frac-Digger method based on seismic data catalogs of the Kamchatka Branch of the Federal Research Center United Geophysical Survey, Russian Academy of Sciences. The analysis of Mohr–Coulomb diagrams shows three main geomechanical states, when the regional seismogenic faults can be active: NWW horizontal extention at an azimuth of 300°, horizontal radial extention, and horizontal radial compression. Hydrothermal explosions occur, when the pore pressure exceeds the stress values in the rock mass.</p>","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"20 2","pages":"67 - 80"},"PeriodicalIF":0.9,"publicationDate":"2026-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147738694","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 Use of Georadar and Gas Surveys for Identification of Discontinuities at the Monogenic Cone on the Khalaktyrsky Beach, Avachinsky Gulf, Kamchatka","authors":"O. V. Bergal-Kuvikas,&nbsp;V. Yu. Pavlova,&nbsp;R. R. Akbashev,&nbsp;E. O. Makarov","doi":"10.1134/S0742046326700065","DOIUrl":"10.1134/S0742046326700065","url":null,"abstract":"<p>This paper presents results from a study of a monogenic cone situated in the Khalaktyrksky beach, Avachinsky, Kamchatka. We used georadar surveying methods to reconstruct the paleo-relief of the monogenic cone and to estimate the thickness of the overlain sediments. Discontinuities are marked by higher values of the spatial distribution for subsoil carbon dioxide in combination with the deformations as detected by the georadar. The data provide evidence of a long-continued degassing from the lavas of the monogenic cone and of activity shown by the discontinuities in the Avachinsky graben of the Malko–Petropavlovsk zone of transverse dislocations.</p>","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"20 2","pages":"164 - 174"},"PeriodicalIF":0.9,"publicationDate":"2026-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147738594","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":"Three-Dimensional Thermohydrodynamic Model of the Mutnovsky Magma–Hydrothermal System","authors":"A. Yu. Polyakov,&nbsp;A. V. Kiryukhin","doi":"10.1134/S074204632670003X","DOIUrl":"10.1134/S074204632670003X","url":null,"abstract":"<p>A three-dimensional numerical thermohydrodynamic model of the Mutnovsky magma–hydrothermal system has been developed based on a comprehensive hydrogeological analysis. The model was implemented using TOUGH2 software with the EWASG state module. The study was conducted in two stages. The first stage simulated the natural state of the system driven only by the conduction heat flow (60 mW/m²), which proved insufficient to account for the observed high temperatures of thermal manifestations. The second stage incorporated additional heat sources of magmatic origin, spatially constrained by Frac-Digger analysis of microearthquakes data (2013‒2025). The model with magmatic heat sources (total power 416 MW) shows good match with field data regarding the temperature and flow rate of the main thermal features. The results support the concept of hydrothermal circulation involving infiltration of meteoric water through the volcanic edifice, lateral transit and heating at depth, and subsequent ascent and discharge along fault zones.</p>","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"20 2","pages":"204 - 210"},"PeriodicalIF":0.9,"publicationDate":"2026-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147738318","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":"Likely Sources of Lithium Mineralization in Intersalt Deposits and a Hydrogeological Model for the Angara–Lena Deposit of Commercial Lithium-Bearing Brine in the Siberian Platform","authors":"A. G. Vakhromeev,&nbsp;M. A. Danilova,&nbsp;E. V. Demidova,&nbsp;S. K. Kvachko,&nbsp;A. V. Kiryukhin,&nbsp;A. T. Korolkov,&nbsp;A. V. Sergeeva,&nbsp;A. V. Oshchepkova,&nbsp;A. V. Levin,&nbsp;A. P. Gorokhov,&nbsp;A. S. Tsoi,&nbsp;V. V. Lukyanov","doi":"10.1134/S0742046326700107","DOIUrl":"10.1134/S0742046326700107","url":null,"abstract":"<p>This analysis of the general processes in the localized migration of lithium from the mantle according to the Romanyuk–Tkachev model as the ultimate mutual interaction between mantle plumes in Northeast Asia and in the Mongolia–Okhotsk slab through intermediate upper crustal magma chambers rests on the examination of mutual locations of intrusive bodies in the basement and in the sedimentary cover of the Siberian craton and of localization regions (as proved by drilling) containing commercial rare-metal brines with anomalously high concentrations of lithium in the natural reservoirs of the zone of retarded water exchange in the sedimentary cover of the major Angara–Lena artesian basin. It is shown how the region of brine occurrence that has anomalous lithium concentrations overlies in space the ring anomaly formed by the emplacement of a large pluton of the (hypothetical) Paleoproterozoic Baikal–Taimyr orogenic belt in the Early Proterozoic basement. On the other hand, a group of large deposits of lithium-bearing brines in the sedimentary cover (an analogue of an “ore field”) localizes in the band between the apical part of the giant Usolsky Sill to the west and the Baikal-Patomsky Folded Region (BPFR) foreland to the east. We are discussing the likely role played by large paleohydrothermal systems of magma bodies in the formation of lithium haloes, in the process of its subsequent transfer of hydrothermal fluids, and concentration in naturally occurring brines beneath thick deposits of Cambrian salts.</p>","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"20 2","pages":"100 - 113"},"PeriodicalIF":0.9,"publicationDate":"2026-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147738595","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":"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}