Journal of Volcanology and Seismology最新文献_第8页

Geochemical Characteristics and the Ore Potential of the Mutnovsky Geothermal Field, Southern Kamchatka 堪察加南部Mutnovsky地热田地球化学特征及找矿潜力

IF 0.9 4区地球科学

Journal of Volcanology and Seismology Pub Date : 2025-10-05 DOI: 10.1134/S0742046325700265

E. D. Skilskaya, A. V. Sergeeva, O. A. Zobenko, I. I. Chernev

{"title":"Geochemical Characteristics and the Ore Potential of the Mutnovsky Geothermal Field, Southern Kamchatka","authors":"E. D. Skilskaya, A. V. Sergeeva, O. A. Zobenko, I. I. Chernev","doi":"10.1134/S0742046325700265","DOIUrl":"10.1134/S0742046325700265","url":null,"abstract":"We provide data on the major and trace element composition of deep waters in the productive reservoirs beneath the Mutnovsky geothermal field confined to the eponymous active volcano in southern Kamchatka. The goal of the present study was to reveal the key role of deep-seated heat carrier in the formation of gold–silver mineralization taking the Mutnovsky geothermal system as an example. Several significant gold–silver ore deposits lie near the system. It has been found that deep waters are mostly alkaline (pH 8.85–9.74) or near-neutral (pH around 6), as well as chloride–sulfate or sulfate–chloride, potassium–sodic or sodium-potassic waters. The salinity varies in the range 260–4465 mg/L. It has been found that salinity is appreciably higher in alkaline waters than in near-neutral. Among the elements reliably detected, the highest concentrations occur for Br, As, Se, Sr, Ba, Li, Ag, and Zn. The suspended particles found in water samples contain compounds such as poorly soluble iodargyrite AgI, naumannite Ag2Se, and electrum (Au, Ag). At present these minerals are formed within the areas of deep-seated vapor-dominated hydrothermal fluids belonging to the Mutnovsky field, forming regions of present-day mineral generation. Arsenic, antimony, selenium, and tellurium occur in alkaline environments in mobile water-soluble forms, and chloride ions favor the mobilization of noble metals, e.g., gold and silver, which tend to make polysulfide and chloride complexes. The mobilization of ore elements increases in alkaline environments owing to the formation of hydroxy complexes, so that for this case alkaline waters have the highest ore potential with regard to noble-metal mineralization.","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"19 5","pages":"435 - 450"},"PeriodicalIF":0.9,"publicationDate":"2025-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145227919","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}

引用次数: 0

Exploration of Regression Models for Homogenization of the Earthquake Magnitude Scales to Study Earthquakes in the Andaman-Nicobar Subduction Zone 安达曼-尼科巴俯冲带地震震级均匀化回归模型的探索

IF 0.9 4区地球科学

Journal of Volcanology and Seismology Pub Date : 2025-10-05 DOI: 10.1134/S0742046325700228

Ashis Kumar Bala, Ujjwal Saha

{"title":"Exploration of Regression Models for Homogenization of the Earthquake Magnitude Scales to Study Earthquakes in the Andaman-Nicobar Subduction Zone","authors":"Ashis Kumar Bala, Ujjwal Saha","doi":"10.1134/S0742046325700228","DOIUrl":"10.1134/S0742046325700228","url":null,"abstract":"The earthquake size is quantified by seismic centers all over the world in several magnitude scales, which requires to be unified into a preferred scale to infer flawless comparison of earthquake size. The problem has been addressed by numerous researchers and converted earthquake magnitudes mostly into moment magnitude from different magnitude scales as relation among them are overdue. In this study, Simple Linear Regression (SLR), Orthogonal Regression (OR), Gaussian Process Regression (GPR), and Support Vector Regression (SVR) have been employed to find out the best method to correlate different earthquake magnitude scales. The Andaman–Nicobar–Subduction Zone, a part of the Sumatra–Andaman–Subduction–Zone which is capable of producing earthquakes of great magnitudes, has been selected for this study. For this study, earthquake data has been extracted from the International Seismological Centre (ISC) earthquake catalog. The study indicates that moment magnitude can be predicted more accurately using multiple scales than single scale. It has also been found that, the GPR model predicts higher earthquake magnitude values better than other methods. Hence, for conversion of earthquake magnitude into standard scale, use of multiple scales and the GPR method can be beneficial.","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"19 5","pages":"490 - 507"},"PeriodicalIF":0.9,"publicationDate":"2025-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145227921","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}

引用次数: 0

Enhancing the Sensitivity of the Seismological Network in the Lena River Delta 提高勒拿河三角洲地震台网的灵敏度

IF 0.9 4区地球科学

Journal of Volcanology and Seismology Pub Date : 2025-08-19 DOI: 10.1134/S0742046325700162

S. N. Ponasenko, P. A. Dergach, A. A. Duchkov

引用次数: 0

The Pliocene–Quaternary Volcanism in the Interfluve of the Kozyrevka and Malaya Romanovka Rivers (The Sredinnyi Range of Kamchatka): The Ages and Compositions of the Rocks 堪察加斯列丁尼山脉科日列夫卡河与马来亚-罗曼诺夫卡河河段的上新世-第四纪火山作用：岩石的年龄和组成

IF 0.9 4区地球科学

Journal of Volcanology and Seismology Pub Date : 2025-08-19 DOI: 10.1134/S0742046325700198

M. M. Pevzner, M. L. Tolstykh, V. A. Lebedev, A. D. Babansky

{"title":"The Pliocene–Quaternary Volcanism in the Interfluve of the Kozyrevka and Malaya Romanovka Rivers (The Sredinnyi Range of Kamchatka): The Ages and Compositions of the Rocks","authors":"M. M. Pevzner, M. L. Tolstykh, V. A. Lebedev, A. D. Babansky","doi":"10.1134/S0742046325700198","DOIUrl":"10.1134/S0742046325700198","url":null,"abstract":"The isotopic K–Ar ages of the volcanoes in the interfluve of the Kozyrevka and Malaya Romanovka rivers in the Sredinny Range of Kamchatka have been determined for the first time. We have identified six phases of activity: the end of the Miocene (5.8–5.5 Ma), the Early Pliocene (4.9–4.5 Ma), the Middle Eopleistocene (1.5–1.4 Ma), the Late Eopleistocene (1.1–1.0 Ma), and the Middle Pleistocene (two phases: 0.6 and 0.4–0.3 Ma). No later volcanism has been recorded in the region. It was found that the start of Quaternary volcanic activity was preceded by a repose period lasting approximately 3 Ma. It was found for the first time that the major fault striking northeast at the northern base of Romanovka Volcano could not have originated before 0.4–0.3 Ma B.P. An analysis of isotopic K–Ar dates suggests that the phases of Quaternary volcanic activity that occurred ∼1.5 and ∼0.3 Ma B.P. were regional in character. Regional activity was less pronounced for the phases ∼1.0 and ∼0.6 Ma B.P. The rocks discharged in the interfluve during the last six million years ranged between basalts and dacites. It was found that the extensive covers and major lava edifices are composed of intermediate and acid rocks, while basalts are confined to small monogenic centers. Overall, the volcanics studied here have chemical compositions that are similar to those of the Late Miocene–Quaternary rocks in the southern Sredinnyi Range. The results of our study alter significantly the previous age estimates for the volcanoes in the area of study at the Sredinnyi range. We suggest that no significant glaciation has occurred in the interfluve of the Kozyrevka and Malaya Romanovka at least during Quaternary time.","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"19 4","pages":"337 - 354"},"PeriodicalIF":0.9,"publicationDate":"2025-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144868894","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}

引用次数: 0

Magmatic Activity of Mutnovsky Volcano and the Formation of a Crater at the Place of the Blowing Well 022 穆特诺夫斯基火山的岩浆活动和吹井处火山口的形成

IF 0.9 4区地球科学

Journal of Volcanology and Seismology Pub Date : 2025-08-19 DOI: 10.1134/S0742046325700216

A. V. Kiryukhin, A. Yu. Polyakov, A. V. Sergeeva, I. A. Nuzhdaev, N. B. Zhuravlev, P. O. Voronin, O. O. Usacheva, M. Yu. Puzankov

{"title":"Magmatic Activity of Mutnovsky Volcano and the Formation of a Crater at the Place of the Blowing Well 022","authors":"A. V. Kiryukhin, A. Yu. Polyakov, A. V. Sergeeva, I. A. Nuzhdaev, N. B. Zhuravlev, P. O. Voronin, O. O. Usacheva, M. Yu. Puzankov","doi":"10.1134/S0742046325700216","DOIUrl":"10.1134/S0742046325700216","url":null,"abstract":"Mutnovsky Volcano is characterized by predominantly magmatic activity for the last 4 thousand years in the northern sector where the Mutnovsky geothermal field lies. Magmatic activity is identified using the Frac-Digger method based on seismic data as reported by the KB FRC UGS RAS. The most significant sequence of shallow dikes striking northeast has been manifested at the surface by blowing two-phase geothermal wells. Dike emplacement in March 2024 was synchronized with a hydrothermal explosion producing a crater of volume reaching 0.36 million m3 at the place of well 022 (Crater 022+). Unaltered fragments due to the explosion indicate a lithoclastic character in the gas-enriched head of the dike. The bottom of the explosion crater is a hydrothermally altered (opal, zeolite) 160 × 75 m2 in area. The mechanism of the hydrothermal explosion is treated as resulting from hydraulic fracturing by means of a shallow dike, with subsequent increase in pressure in the shallow geothermal reservoir near the well with a closed wellhead control-valve.","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"19 4","pages":"303 - 318"},"PeriodicalIF":0.9,"publicationDate":"2025-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144868896","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}

引用次数: 0

Erratum to: The Assessment of Tsunami Hazard for the Coast of the Korf Bay, Bering Sea: Numerical Simulation 白令海Korf湾沿岸海啸灾害评估：数值模拟

IF 0.9 4区地球科学

Journal of Volcanology and Seismology Pub Date : 2025-08-19 DOI: 10.1134/S0742046325550019

V. K. Gusiakov, S. A. Beisel, O. I. Gusev, A. V. Lander, D. V. Chebrov, L. B. Chubarov

引用次数: 0

Tephra in Lake Sediments of Magadan Region 马加丹地区湖泊沉积物中的苔虫

IF 0.9 4区地球科学

Journal of Volcanology and Seismology Pub Date : 2025-08-19 DOI: 10.1134/S0742046325700186

P. S. Minyuk, D. K. Pozhidaeva, O. T. Sotskaya, S. S. Burnatnyi, A. V. Lozhkin, P. M. Anderson, G. Yu. Malakhova

{"title":"Tephra in Lake Sediments of Magadan Region","authors":"P. S. Minyuk, D. K. Pozhidaeva, O. T. Sotskaya, S. S. Burnatnyi, A. V. Lozhkin, P. M. Anderson, G. Yu. Malakhova","doi":"10.1134/S0742046325700186","DOIUrl":"10.1134/S0742046325700186","url":null,"abstract":"Tephra of two generations has been identified in sediments of the numerous lakes lying from the coast of the Sea of Okhotsk in the south as far as the Indigirka River basin in the north. Tephra of different ages differs in area of occurrence, and in petromagnetic, geochemical, mineralogical, and thermomagnetic characteristics, thus enabling reliable identification in sections. The accumulation of lower tephra was due to an eruption that formed the caldera of Lake Kurilskoe in Kamchatka about 7600 B.P. It has been found in all lakes where sedimentation was occurring at that time. The character of tephra occurrence was controlled by the distance to the source, by morphologic and hydrodynamic parameters of the lakes, as well as by post-sedimentation processes. The tephra has a rhyolitic composition with silica concentrations of 75.6–75.9%; it is low-magnetic. The magnetic particles are mostly pseudo-single-domain ones. The tephra is dominated by titanomagnetites with mean concentrations of titanium within ∼3.6–6.5 wt %. The upper tephra only occurs in the northern Okhotsk region. It shows high magnetic properties and is dominated by low-titanium titanomagnetites (Ti = 2.6–3.2 wt %). The magnetic particles are pseudo-single-domain to multidomain (closer to multidomain). The magnetic susceptibility of the tephra layers, which is an order higher than that of the host sediments, is its leading distinctive feature. The tephra has a rhyodacitic composition with silica concentrations of 70.2–70.5%. Its age is about 3000 years. The tephra interbeds in lake sediments are important chronological and correlative markers of the Holocene.","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"19 4","pages":"355 - 375"},"PeriodicalIF":0.9,"publicationDate":"2025-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144868893","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}

引用次数: 0

Gabbro on the Esmeralda Submarine Volcano, Mariana Island Arc 马里亚纳岛弧埃斯梅拉达海底火山上的辉长岩

IF 0.9 4区地球科学

Journal of Volcanology and Seismology Pub Date : 2025-08-19 DOI: 10.1134/S0742046325700174

P. I. Fedorov, V. A. Rashidov, V. V. Ananiev

{"title":"Gabbro on the Esmeralda Submarine Volcano, Mariana Island Arc","authors":"P. I. Fedorov, V. A. Rashidov, V. V. Ananiev","doi":"10.1134/S0742046325700174","DOIUrl":"10.1134/S0742046325700174","url":null,"abstract":"This study is concerned with the mineralogical and petrochemical composition of the gabbro sampled on the Esmeralda submarine volcano in the southern Mariana island arc. The dredging was carried out during the 4th and 5th cruises of the research vessel Vulkanolog. It has been found that the gabbro, which belongs to the tholeiitic series, are strongly fractionated rocks, unlike the gabbroids dredged in basins of the southern Mariana island arc system. It is shown that this gabbro typically contains higher concentrations of iron. This higher concentration of iron is confirmed by high concentrations of iron in pyroxenes and plagioclase, which enables us to classify the bulk of dredged gabbro as belonging to the association of arc ferruginous tholeiites. Low concentrations of high charge and heavy rare-earth elements relative to MORB, as well as their interelement relationships, imply the formation of primary melts from a source in a depleted mantle. The enrichment of gabbro in large-ion lithophile elements provides evidence that the magma genesis not only involved high-temperature residual melt, but was also significantly affected by low-temperature fluid components.","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"19 4","pages":"376 - 389"},"PeriodicalIF":0.9,"publicationDate":"2025-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144869009","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}

引用次数: 0

The Chemical and Phase Composition of High Temperature Sublimates: Avachinsky Volcano, Kamchatka 堪察加半岛阿瓦钦斯基火山高温升华物的化学和物相组成

IF 0.9 4区地球科学

Journal of Volcanology and Seismology Pub Date : 2025-08-19 DOI: 10.1134/S0742046325700204

E. Yu. Plutakhina, N. A. Malik, I. Yu. Nikolaeva

{"title":"The Chemical and Phase Composition of High Temperature Sublimates: Avachinsky Volcano, Kamchatka","authors":"E. Yu. Plutakhina, N. A. Malik, I. Yu. Nikolaeva","doi":"10.1134/S0742046325700204","DOIUrl":"10.1134/S0742046325700204","url":null,"abstract":"This paper presents the results of a study of sublimates (mineral deposits from volcanic gases) that have been collected in silica tubes placed at high-temperature vents in the Eastern Fumarolic Field of Avachinsky Volcano, Kamchatka in 2013–2023. The ICP-MS and ICP-AES methods were used to obtain the concentration distributions for 62 elements throughout the tube lengths, i.e., along the temperature gradient. A total of 35 sublimate phases corresponding to naturally occurring minerals have been identified, in addition to 7 sublimate phases for which there are no naturally occurring analogues, or they are still unknown. The overall mineral sequence with decreasing temperature is as follows: Na and K halogenides; Na, K, and Ca sulphates; sulfides; As–S amorphous glass, and Tl, Pb, and Bi halogenides. The most abundant phases are As–S glass, SiO2 (cristobalite), NaCl, KCl, Na2SO4‒K2SO4; rare phases: KCdCl3, K2Pb(SO4)2, Tl(I, Cl, Br), Pb2Tl(Cl, I, Br)5, PbTl3(Cl, I, Br)5, Pb(Cl, I, Br)2, Tl3BiI6, ReS2, the sulfides of Pb–Zn–Cd–In and AgI.","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"19 4","pages":"319 - 336"},"PeriodicalIF":0.9,"publicationDate":"2025-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144868895","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}

引用次数: 0

The 2019 Mw 5.4 East Lombok Earthquake, West Nusa Tenggara: A Shallow Fault Reactivation in the Sembalun Caldera Area of Lombok Island 2019年西努沙登加拉东龙目岛5.4 Mw地震：龙目岛Sembalun火山口地区的浅层断层重新激活

IF 0.9 4区地球科学

Journal of Volcanology and Seismology Pub Date : 2025-08-19 DOI: 10.1134/S0742046325700150

Mohammad Syamsu Rosid, I Gusti Ketut Satria Bunaga, Titi Anggono, Gatut Daniarsyad, Abraham Arimuko, Mohammad Najib, Yosi Setiawan, Dimas Sianipar, Ardhianto Septiadhi, Suko Prayitno Adi, Dzikrullah Akbar

{"title":"The 2019 Mw 5.4 East Lombok Earthquake, West Nusa Tenggara: A Shallow Fault Reactivation in the Sembalun Caldera Area of Lombok Island","authors":"Mohammad Syamsu Rosid, I Gusti Ketut Satria Bunaga, Titi Anggono, Gatut Daniarsyad, Abraham Arimuko, Mohammad Najib, Yosi Setiawan, Dimas Sianipar, Ardhianto Septiadhi, Suko Prayitno Adi, Dzikrullah Akbar","doi":"10.1134/S0742046325700150","DOIUrl":"10.1134/S0742046325700150","url":null,"abstract":"Shallow fault reactivation has been identified, likely related to the 5.69 Mw East Lombok earthquake on March 17, 2019. Using relocation hypocenters and a focal mechanism analysis, the structure can be analyzed. The relocation results showed a more geologically meaningful hypocenter distribution than before relocating, which enabled a structural analysis. In this case, the mainshock clearly showed a dipping slip (a strike angle of ∼97°, a dipping angle of ∼66°, and a rake of ∼102°) extending ∼25 km from the northeast to the southwest. After cross-correlation, the largest relocated aftershock (Mw 5.1) either occurred on the same ruptured plane as the mainshock or was not caused by a different earthquake source. From the analysis of geological data, the mainshock was related to an inland fault close to the Sembalun caldera. Additionally, the high stress of the 2018 Lombok earthquake may have triggered the 2019 East Lombok earthquake according to Coulomb stress changes. This study provides valuable information about the addition of the active fault zones on Lombok Island, improving our understanding of this unique seismic activity in an unusual place. Moreover, the Sembalun region is one of the most popular tourist destinations on Lombok Island. Consequently, this study is crucial for developing future seismic risk mitigation strategies.","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"19 4","pages":"397 - 409"},"PeriodicalIF":0.9,"publicationDate":"2025-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144869010","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}

引用次数: 0