Journal of Volcanology and Seismology最新文献

{"title":"Tephra in Lake Sediments of Magadan Region","authors":"P. S. Minyuk,&nbsp;D. K. Pozhidaeva,&nbsp;O. T. Sotskaya,&nbsp;S. S. Burnatnyi,&nbsp;A. V. Lozhkin,&nbsp;P. M. Anderson,&nbsp;G. Yu. Malakhova","doi":"10.1134/S0742046325700186","DOIUrl":"10.1134/S0742046325700186","url":null,"abstract":"<p>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.</p>","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}

{"title":"Gabbro on the Esmeralda Submarine Volcano, Mariana Island Arc","authors":"P. I. Fedorov,&nbsp;V. A. Rashidov,&nbsp;V. V. Ananiev","doi":"10.1134/S0742046325700174","DOIUrl":"10.1134/S0742046325700174","url":null,"abstract":"<p>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 <i>Vulkanolog</i>. 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.</p>","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}

{"title":"The Chemical and Phase Composition of High Temperature Sublimates: Avachinsky Volcano, Kamchatka","authors":"E. Yu. Plutakhina,&nbsp;N. A. Malik,&nbsp;I. Yu. Nikolaeva","doi":"10.1134/S0742046325700204","DOIUrl":"10.1134/S0742046325700204","url":null,"abstract":"<p>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.</p>","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}

{"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,&nbsp;I Gusti Ketut Satria Bunaga,&nbsp;Titi Anggono,&nbsp;Gatut Daniarsyad,&nbsp;Abraham Arimuko,&nbsp;Mohammad Najib,&nbsp;Yosi Setiawan,&nbsp;Dimas Sianipar,&nbsp;Ardhianto Septiadhi,&nbsp;Suko Prayitno Adi,&nbsp;Dzikrullah Akbar","doi":"10.1134/S0742046325700150","DOIUrl":"10.1134/S0742046325700150","url":null,"abstract":"<p>Shallow fault reactivation has been identified, likely related to the 5.69 <i>M</i>_w 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 (<i>M</i>_w 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.</p>","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}

{"title":"The Perevalnoe Silver-Polymetallic Deposit in the Dukat Ore Field (Balygychan—Sugoi Volcano Depression, Northeast Russia)","authors":"N. E. Savva,&nbsp;A. V. Volkov","doi":"10.1134/S0742046325700137","DOIUrl":"10.1134/S0742046325700137","url":null,"abstract":"<p>This study is the first examination of the geological structural and mineralogical-geochemical features of the Perevalnoe silver-polymetallic deposit, Northeast Russia. The deposit lies in the northeastern flank of the Dukat ore field in the middle of the Balygychan–Sugoi riftogenic volcanic depression which was formed synchronously with the structures of the Okhotsk–Chukchi volcanogenic belt (OChVB). The deposit lies along the periphery of a volcanic dome rise and is localized in a large subvolcanic dike consisting of Late Cretaceous porphyritic rhyolites (nevadites) at a depth of 140–160 m beneath the ground surface. The richest mineralization is controlled by geniculate bends in the dike. The bulk of silver in the ores is mostly related to Ag-tetrahedrite and freibergite. As well, a substantial amount of silver is due to pyrargyrite, native silver, acanthite, and the sulfurous analogue of geffroyite ((Ag, Cu, Fe)₉(Se, S)₈). A small fraction of silver is related to rare (for these ores) minerals, namely, proustite, argentopyrite, and minerals of the isomorphous series lenaite (AgFeS₂)—chalcopyrite. The chief mineralogical peculiarity of these ores consists in a wide occurrence of coarse-flake muscovite and rutile, the presence of rhodonite, anatase, zirconium, and leucoxene. The carbonates are dominated by siderite and rhodochrosite. The Perevalnoe deposit was found to involve a two-phase mineralization, namely, telescoped superposition of high-temperature greisens (those of the later phase) upon silver-polymetallic ores (those of the earlier phase) with distinct signs of thermal metamorphism of the latter and the associated natural enrichment in Ag. Greisenization and the arrival of high-temperature brine seem to be related to the emplacement of the later phase of an unexposed intrusive massif. The results of mineralogical studies enable us to classify the Ag-polymetallic Perevalnoe deposit, similarly to the other mineral deposits in the Omsukchan metallogenic zone, as the intermediate sulfidation epithermal class of deposits.</p>","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"19 3","pages":"224 - 237"},"PeriodicalIF":0.9,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145168208","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":"Crater Lakes on Vernadsky Range, Paramushir Island (Kuril Islands): The Water Balance and the Dynamics","authors":"T. A. Kotenko","doi":"10.1134/S074204632570006X","DOIUrl":"10.1134/S074204632570006X","url":null,"abstract":"<p>The water balance is considered for the summit crater lakes on the Vernadsky Range, Paramushir Island. The input was based on precipitation at the crater heights. The necessary condition for the existence of permanent cold crater lakes with a precipitation of ∼4660 mm per hydrologic year is a drainage area exceeding 60 thousand m². The evolution of the lakes lying in the craters of the active Ebeko Volcano is discussed. An estimate is provided for volcanic input (inflow of water and/or vapor of volcanic origin) into thermal lakes during the preceding time periods and during the present-day condition of the volcano. The Middle Crater and the Korbut Crater are suitable for the formation of hot lakes. The formation of a lake in the Korbut Crater is impossible until the eruption in the crater has come to an end. A volcanic input of 8–13 kg/s will be sufficient for an equilibrium existence of a lake with temperature 35°С and water area 25 thousand m², assuming a crater diameter of 250 ± 50 m during the post-eruption period. The supply of volcanic vapor into Lake Goryachee in the Middle Crater has been recorded since 2017, but the lake remains cold. The volcanic input must be 5 ± 2 kg/s in order to achieve a balance equilibrium for a lake with temperature 35°С and water area 25 thousand m².</p>","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"19 2","pages":"143 - 154"},"PeriodicalIF":0.9,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169510","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 Correlation between Signals of Aerosol Lidar, Laser Strainmeter, and the Temperature of Gas in Bedrock: Measurements in the Baksan Neutrino Observatory during the Earthquakes in Turkey on February 6, 2023","authors":"S. M. Pershin,&nbsp;E. I. Gordeev,&nbsp;V. V. Gravirov,&nbsp;M. Ya. Grishin,&nbsp;V. A. Zavozin,&nbsp;V. N. Lednev,&nbsp;D. V. Likhodeev,&nbsp;V. S. Makarov,&nbsp;A. V. Myasnikov,&nbsp;A. A. Ushakov","doi":"10.1134/S0742046325700113","DOIUrl":"10.1134/S0742046325700113","url":null,"abstract":"<p>We report for the first time to our knowledge an asymmetry in the signals of the laser strainmeter at the Baksan Neutrino Observatory (BNO), Elbrus area during the first and second earthquakes in Turkey on February 6, 2023, which had nearly identical magnitudes. A correlation has been detected between the signals of the laser strainmeter and the temperature inside the bedrock foundation in the BNO dead-end tunnel, as well as the signal of aerosol lidar during the second magnitude 7.7 earthquake occurring at 10:24 UTC. The radius of the stress zone around the epicenters was estimated as ∼2000 km, which exceeds the distance to the BNO tunnels (~900 km) and thus admits of the variations of stress and strain to be seen in the signals of the laser strainmeter, the thermometer, and the lidar.</p>","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"19 3","pages":"266 - 270"},"PeriodicalIF":0.9,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169514","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":"New Evidence for the Age of Young Volcanic Formations in the Chegem River Basin, North Caucasus, Russia","authors":"V. A. Lebedev,&nbsp;E. N. Kaigorodova","doi":"10.1134/S0742046325700125","DOIUrl":"10.1134/S0742046325700125","url":null,"abstract":"<p>Isotope geochronology applied to several occurrences of young volcanic activity on the northern slope of the Greater Caucasus in the Chegem River basin, Kabardino-Balkaria, Russia, which were classified by different researchers as belonging to either the Jurassic Period or to the Late Cenozoic, aided toward determining their age and place in the regional geochronological scale of the Neogene–Quaternary magmatism occurring in the Elbrus neovolcanic area. We have established stratigraphic interrelationships between the geological objects studied here and the products of catastrophic explosive volcanism, which resulted in the formation of the large Chegem Caldera in the study region at the end of the Neogene. We determined more accurately whether the volcanic vents that were active in the Late Pliocene could be classified as belonging to the pre-caldera, syn-caldera, or post-caldera stages of magmatism. The results of K–Ar dating obtained here show that the endogenous activity in the region of study was of areal character during the pre-caldera stage (about 3.1 Ma). During that period volcanic occurrences were taking place at many small volcanic vents that are at present completely demolished and are marked by dikes and stocks of rhyolites, less frequently of trachyandesites. At the end of the Pliocene, during the period 2.9–2.8 Ma, catastrophic explosive eruptions occurred giving rise to the Chegem Caldera filled with a thick sequence of rhyolite–dacite ignimbrites. According to the data acquired by us, a series of acid extrusions and dikes composed of vitrophyres were emplaced along its western, southern, and eastern periphery simultaneously with the caldera formation. The post-caldera stage (about 2.8 Ma) saw activity exhibited by Kum-Tyube and Kyugenkaya stratovolcanoes in the western part of the caldera which discharged lavas of dacitic composition, and later on also of andesitic composition. It was found that no volcanic activity has been occurring during Quaternary time throughout almost all of the basin of the upper reaches of the Chegem River. One exception is furnished by the environs of the Aktoprak Pass in the northwestern part of the area of study where local manifestations of moderately-alkaline magmatism were recorded to occur in the Early Pleistocene (about 1 Ma). Several geological objects (Bashil Dam and others) which were previously dated by some researchers to the period between the end of the Pleistocene and the Holocene are in fact either Pliocene syn-caldera extrusions or were formed by exogenous processes unrelated to volcanic activity.</p>","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"19 3","pages":"238 - 265"},"PeriodicalIF":0.9,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145168207","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 2024 Eruption Dynamics of the Grot Geyser (Geyser Valley, Kamchatka)","authors":"A. V. Kiryukhin,&nbsp;M. Yu. Nesterenko,&nbsp;O. O. Usacheva","doi":"10.1134/S0742046325700149","DOIUrl":"10.1134/S0742046325700149","url":null,"abstract":"<p>This paper describes the results of the 2024 visual and instrumental observations of eruptions at Grot Geyser in Geyser Valley, Kamchatka. It was found that the eruption behavior of Grot Geyser has significantly changed: while previously being an irregularly erupting geyser, Grot had become a relatively regularly erupting geyser whose interval between eruptions were 10.4 h during the winter low-water period, an intermission during the most intensive flood, and a subsequent resumption of geyser activity at intervals of 24 h. The volume discharged by a Grot eruption is estimated as ≈70 m³ using the chloride tracer method.</p>","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"19 3","pages":"215 - 223"},"PeriodicalIF":0.9,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145168258","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":"A Synthetic Earthquake Catalog for the Eastern Sector of the Russian Arctic Zone","authors":"P. N. Shebalin,&nbsp;A. D. Gvishiani,&nbsp;P. A. Malyutin,&nbsp;E. M. Grekov,&nbsp;A. O. Antipova,&nbsp;I. A. Vorobieva,&nbsp;B. A. Dzeboev,&nbsp;B. V. Dzeranov","doi":"10.1134/S0742046325700083","DOIUrl":"10.1134/S0742046325700083","url":null,"abstract":"<p>In this study we develop a synthetic earthquake catalog for the Eastern Sector of the Russian Arctic Zone (RAZ). The catalog reproduces and simulates the key properties of the catalog that includes all earthquakes that have actually occurred in the region. Considered at the regional level, the Gutenberg–Richter law for earthquakes of different magnitudes holds both for the catalog as a whole and for the mainshock catalog with aftershocks eliminated. Local values of the parameters involved are reproduced. The synthetic catalog includes aftershocks, and local relationships between the numbers of aftershocks and the total number of earthquakes based on the catalog of actual events are retained. Our model for the spatial distribution of large (<i>М</i> ≥ 5.5) earthquakes in the region uses the results of the FCAZ recognition applied to identification of possible locations of future large earthquakes. Preliminary calculations have been performed to find the normative intensity in order to compare three versions of the synthetic catalog (the full model, one without aftershocks, and one that does not include the FCAZ results and aftershocks).</p>","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"19 2","pages":"113 - 126"},"PeriodicalIF":0.9,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169512","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}