Journal of Volcanology and Seismology最新文献

{"title":"Microseisms as a Tool for Geophysical Research. A Review","authors":"A. N. Besedina,&nbsp;Ts. A. Tubanov","doi":"10.1134/S0742046323700112","DOIUrl":"10.1134/S0742046323700112","url":null,"abstract":"<p>The research in seismic ambient noise as a tool for geophysical studies must primarily rely on the space-time characteristics of the noise itself. What is important in this research is to characterize the distribution of noise sources both over frequency and in energy content. The present review considers the main mechanisms for the generation of microseisms, including primary and secondary microseisms (0.05–0.3 Hz), low frequency oscillations (0.2–50 mHz), high frequency oscillations (2–60 Hz), and lake-generated microseisms (0.5–2 Hz). We also describe the most popular procedures in use for the processing and analysis of continuous seismic ambient noise arrivals; we demonstrate a wide range of geophysical problems based on recordings of microseismic ground motion.</p>","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"17 2","pages":"83 - 101"},"PeriodicalIF":0.7,"publicationDate":"2023-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4134899","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 Results of Long-Term Observations of Electric Fields in the Atmosphere during the 2018‒2020 Eruption of Ebeko Volcano","authors":"R. R. Akbashev,&nbsp;E. O. Makarov","doi":"10.1134/S0742046323700094","DOIUrl":"10.1134/S0742046323700094","url":null,"abstract":"<p>The gradient of potential in the atmospheric electric field was recorded in the town of Severo-Kurilsk in order to study the formation of 3D electric charges in eruption clouds due to explosions during the 2018–2020 eruptions of Ebeko Volcano. A total of 179 cases were recorded in which the eruption cloud was propagating under cloudless conditions (or nearly so) accompanied by responses in the variations of electric potential in the atmosphere. Four characteristic types of response have been identified in the variations of atmospheric electric field potential. It is shown that the type of recorded response was controlled by the conditions of propagation for the eruption cloud relative to the recording site, as well as being influenced by mutual positions of the charges in the lower and upper regions of the eruption cloud at the time the response was recorded. The eruption cloud was dominated by a negative 3D electric charge localized in the upper region of the eruption cloud, while the positive 3D electric charge was localized in the lower region. The field observations are in agreement with the results of numerical simulation.</p>","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"17 2","pages":"134 - 146"},"PeriodicalIF":0.7,"publicationDate":"2023-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4136991","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 Volcanism Occurring during the Initial Phase of Formation of the Northern Subduction Segment in the Pacific Plate (Kamchatka Peninsula, Kumroch Range)","authors":"M. L. Tolstykh,&nbsp;A. D. Babansky,&nbsp;M. D. Smirnova,&nbsp;M. M. Pevzner,&nbsp;V. A. Lebedev,&nbsp;Yu. O. Larionova,&nbsp;Yu. V. Kushcheva,&nbsp;A. V. Parfenov","doi":"10.1134/S0742046323700100","DOIUrl":"10.1134/S0742046323700100","url":null,"abstract":"<p>The present paper reports a study of rocks in Mts. Baidara and Semkorok, which are situated in the northwestern flank of the Kumroch Range. The rocks are Amf-Px basaltic andesites and andesites, and are characterized by an arc type of trace element distribution. Some mineralogical and geochemical features in the composition of lavas sampled at Mt. Baidara (low concentrations of K₂O, as well as of the entire range of REEs, of large-ion elements, thorium, and uranium) and at Mt. Semkorok (low concentrations of light REEs) are substantially different from the rocks of the adjacent Shiveluch Late Pleistocene–Holocene volcanic massif. The K-Ar isotopic lava ages are ~0.7 Ma (Baidara) and ~1.3 Ma (Semkorok), suggesting the inference that the eruptions might be related to the initial phase in the formation of the northern subduction segment in the Pacific plate.</p>","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"17 2","pages":"119 - 133"},"PeriodicalIF":0.7,"publicationDate":"2023-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4136980","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 Velocity Structure at Depth and Seismicity in the Transbaikalia Region (along the 1-SB Geological-Geophysical Reference Traverse)","authors":"V. M. Solovyev,&nbsp;V. S. Seleznev,&nbsp;A. S. Salnikov,&nbsp;V. V. Chechelnitsky,&nbsp;N. A. Gileva,&nbsp;A. V. Liseikin,&nbsp;A. A. Bryksin,&nbsp;N. A. Galyova","doi":"10.1134/S0742046323700082","DOIUrl":"10.1134/S0742046323700082","url":null,"abstract":"<p>This study is concerned with an analysis of seismicity and deep structure in the Transbaikalia along the 1-SB reference geophysical traverse. We have found a complex inhomogeneous structure of the crust and upper mantle. The crustal thickness varies between 40 km in the southeastern part of the traverse and in intermontane troughs in its northwestern part on the one hand and 48 km in mountain ranges. Strong variation also affects boundary velocities at the Moho, ranging from 8.4‒8.5 km/s for compressional waves and 4.9‒4.95 km/s for shear waves (especially in the southeastern part of the traverse) to lower values of 7.8‒8.0 km/s for compressional waves and 4.6‒4.7 km/s for shear waves in the area of the Baikal Rift Zone in the northwestern part of the traverse. A strongly inhomogeneous earth structure based on elastic wave velocities, Vp/Vs velocity ratios, and Poisson’s ratio was found for upper and middle crust at depths of 8‒20 km. It was also found that zones of higher seismicity tend to coincide with crustal blocks with inhomogeneous velocity structure based on differently polarized compressional and shear waves. Higher inhomogeneity in upper crust as inferred from elastic wave velocities and secondary earth parameters (Vp/Vs velocity ratios, the parameter K* = Vp/(γ ‒ 1), where γ = Vp/Vs, and Poisson’s ratio (σ)) characterize the area of the Baikal Rift Zone in an immediate vicinity of the great Muya earthquake of 1957 with <i>М</i> = 7.6. As well, several other deep zones of inhomogeneity have been identified along the traverse line based on anomalies of Р and S velocities and secondary earth parameters that correlate to varying degrees with seismically active areas based on multiyear instrumental observations. We have identified an unambiguous relationship of large inhomogeneous zones in the Transbaikalia crust with stress buildup and stress release in the shape of large earthquakes, thus substantiating the intermediate-term prediction of catastrophic events.</p>","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"17 2","pages":"147 - 158"},"PeriodicalIF":0.7,"publicationDate":"2023-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4137523","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 Magnetic Field in the Geothermal Systems of the Pauzhetka Area, Southern Kamchatka","authors":"I. A. Nuzhdaev,&nbsp;S. N. Rychagov,&nbsp;S. O. Feofilaktov,&nbsp;D. K. Denisov","doi":"10.1134/S0742046322060033","DOIUrl":"10.1134/S0742046322060033","url":null,"abstract":"<p>Our multiyear studies have enabled us to make maps showing magnetic anomalies Δ<i>T</i>_a for major geothermal systems in the Pauzhetka area of southern Kamchatka. Magnetic fields possess both general characteristics and individual features for each object of study. The Nizhne-Koshelev vapor-dominated geothermal field is identified on the basis of a set of linear negative magnetic anomalies confined to thermal-controlling tectonic faults. The Pauzhetka geothermal field is characterized by an inhomogeneous structure of the anomalous magnetic field Δ<i>T</i>_a: the northwestern area has a quiet, slightly negative magnetic field, showing that this part of the field is dominated by lateral spreading of hydrothermal fluids from the upper aquifer; the southeastern part has numerous sign-varying magnetic anomalies of high intensity confined to acid–intermediate subvolcanic bodies. The South Kambalnyi group of thermal fields is characterized by a lower absolute value of magnetic induction <i>Т</i> compared with the Pauzhetka and the Nizhne-Koshelev geothermal fields, showing that the rocks of the Kambalnyi volcanic range are more intensely altered by hydrothermal and metasomatic processes, probably as a result of a long-continued action of convective heat flow.</p>","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"17 2","pages":"102 - 118"},"PeriodicalIF":0.7,"publicationDate":"2023-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4136978","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 Avacha–Koryaksky Volcanic Group: Geophysical Inhomogeneity of the Lithosphere and Processes at Depth (Kamchatka)","authors":"V. A. Loginov,&nbsp;L. I. Gontovaya,&nbsp;S. L. Senyukov","doi":"10.1134/S074204632270004X","DOIUrl":"10.1134/S074204632270004X","url":null,"abstract":"<p>This paper reports the results of seismic, electromagnetic, and gravity surveys, as well as seismicity data in the lithosphere at depth for the active volcanoes in the Avacha–Koryaksky group which is part of the East Kamchatka volcanic belt. We have developed an integrated geophysical model for the crust and lithospheric mantle in the area of study. The resulting distribution of crustal geophysical inhomogeneities, in particular, beneath Avacha Volcano, was used to study the main features of intracrustal fluid saturation and of pathways as channels for deeper fluids to rise to the upper crust. The integrated model assumes that the stresses that arise at boundaries of zones with different conditions of defluidization constitute one of the factors to produce seismicity beneath the active volcanoes. We also incorporate data from regional seismic tomography to deal with a general scheme for deep processes in the lithosphere and the system that supplies magma to the volcanoes. It is assumed that active volcanoes, in particular, Avacha, are connected to the asthenospheric layer of the lithosphere mantle at a depth of about 70–120 km, whence fluids/melts are coming into the magma chamber in the lower crust with subsequent formation of a peripheral chamber in the upper crust beneath the volcanic cone due to the heat supplied by the lower crustal source.</p>","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"17 1","pages":"27 - 36"},"PeriodicalIF":0.7,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5076693","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":"On the Mixing of High Alumina and High-Magnesium Magmas on Klyuchevskoi Volcano, Kamchatka","authors":"S. A. Khubunaya,&nbsp;V. S. Khubunaya,&nbsp;A. P. Maksimov","doi":"10.1134/S0742046322700051","DOIUrl":"10.1134/S0742046322700051","url":null,"abstract":"<p>We have identified signs showing mixing of moderately potassic magnesian and high alumina magmas on Klyuchevskoi Volcano based on the analysis of mineral compositions and the geochemistry of trace elements during crystallization. The mineralogy and distribution of Mg, Fe, Cr, Ni, Co, and Al in olivines and clinopyroxenes which are contained in the magnesian basalts and high alumina basaltic andesites discharged by the flank and summit eruptions of Klyuchevskoi in 1938, 1966, 1945, and 1994, all provide evidence of an injection of magnesian basaltic melts into high alumina magma.</p>","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"17 1","pages":"17 - 26"},"PeriodicalIF":0.7,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4780438","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":"Giant Martian Volcano-Tectonic Mega Morphostructures and Their Likely Terrestrial Mini Analogues","authors":"I. V. Melekestsev","doi":"10.1134/S0742046322700014","DOIUrl":"10.1134/S0742046322700014","url":null,"abstract":"<p>We show that the terrestrial land and seafloor contain no volcano-tectonic mega landforms expressed in relief that could be similar in size to those identified on Mars, and could have analogous structure and origin to the giant landforms whose volumes of constituent rocks are (1‒2.4) × 10⁶ km³ (Alba Patera, Olympus Mons, Arsia Mons, Ascraeus Mons, Pavonis Mons, and Elysium Mons). No fragments or traces of similar features have ever been unambiguously identified and described in geological rock sequences, not only in Mesozoic and Cenozoic rock sequences, but also in those dating back to Paleozoic time. The same applies to the older epochs on Earth. Now the topographic constituent components of Martian mega landforms have the appearance of very magnified copies of well-known and repeatedly described terrestrial volcanic edifices, viz., dominantly shield-like and lava volcanoes, lava domes, as well as calderas of various types. However, the edifices of the above types of volcanoes are not identical with their Martian counterparts as to morphology, being shorter in height and having steeper slopes. The calderas are smaller by factors of multiple times. The Martian volcanic landforms are much older. There is a unique edifice, namely, Olympus Mons, a mega landform that stands in a large glacier sheet and for whose origin glacial processes are also responsible. It is classified as belonging to the type of giant tuyas. Its mini analogues are glacial subaerial tuyas of different ages and parameters that have been subjected to glaciation in volcanic areas on Earth.</p>","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"17 1","pages":"60 - 73"},"PeriodicalIF":0.7,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4778307","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":"Minerals with Mixed Anion Radicals in Fumarole-Transformed Crustal Micro Xenoliths as a New Phenomenon of Present-Day Volcanism","authors":"V. I. Silaev,&nbsp;L. P. Vergasova,&nbsp;V. N. Filippov,&nbsp;I. V. Smoleva,&nbsp;S. V. Moskaleva,&nbsp;A. F. Khazov,&nbsp;B. A. Makeev,&nbsp;A. P. Shablinsky","doi":"10.1134/S0742046322700026","DOIUrl":"10.1134/S0742046322700026","url":null,"abstract":"<p>This paper reports a study of xenoliths sampled in marine sedimentary carbonate rocks in fumaroles of the crater zone in the Second Cone of the GTFE (Great Tolbachik Fissure Eruption) North Vent. These rocks have been subjected to the action of the GTFE exhalative pneumatolytic fluids, resulting in carbonates giving rise to numerous compounds with mixed carbonate-sulfate-chloride anion radicals, which are treated as two interclass and nine intertype crystal-chemical hybrids. The patterns identified in the altered micro xenoliths, which consist in inhomogeneities of mineral paragenesis, are treated here as resulting from successive epigenetic transformation of the original carbonates to, at first, sulfate carbonates, then to carbonate sulfates, and subsequently to chloride-carbonate-sulfates and chlorides. Judging by an absence of signs of phase heterogeneity, the crystal-chemical hybrids studied here are homogeneous solid-phase mixtures of carbonates, sulfates, and chlorides in varying proportions. The carbonates in the micro xenoliths have isotopic compositions of carbon (δ¹³С_PDB = –5.34 ± 0.62‰) and oxygen (δ¹⁸O_SMOW = 24.09 ± 1.05‰) that are consistent with carbonates to be found in marine sedimentary limestones that were redeposited during volcanogenic transportation. The sulfate sulfur has the isotopic composition (δ³⁴S = 1.5–2‰) varying within the range of variation established for sulfates of volcanogenic origin. In the carbonaceous particles associated with micro xenoliths, the isotopic composition of carbon (δ¹³C_PDB = –27.37 ± 2.97‰) and of nitrogen (δ¹⁵N_Air = 6.74 ± 2.48‰) tend toward the mode in the distribution of these values in the ejecta of present-day continental volcanism. The crystal-chemical hybrids identified here furnish a typomorphic criterion for the exhalation fumarole facies and are treated as a previously unknown phenomenon of present-day volcanism.</p>","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"17 1","pages":"42 - 59"},"PeriodicalIF":0.7,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5076696","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 Lake Kipyashchee in the Caldera of Golovnin Volcano: Water and Gas Geochemistry, Output of Magmatic Volatiles (Kunashir Island)","authors":"E. G. Kalacheva,&nbsp;Yu. A. Taran,&nbsp;E. V. Voloshina,&nbsp;K. V. Tarasov,&nbsp;D. V. Melnikov,&nbsp;T. A. Kotenko,&nbsp;D. Yu. Erdnieva","doi":"10.1134/S0742046322700063","DOIUrl":"10.1134/S0742046322700063","url":null,"abstract":"<p>Lake Kipyashchee ~4.6 ha in area whose greatest depth is 25 m fills an explosion crater near an extrusive dome in the Golovnin caldera. The lake water is ultra acid (рН 2.2–2.5), is of the chloride–sulfate type with a salinity of 2.0–2.2 g/L. The water temperature varies between 30 and 100°С at the surface, with the mean value being 37°С. The lake emptied itself via Protoka into Lake Goryachee at a rate of 120 L/s in August 2021. The hydrothermal drainage of magmatic Cl and S (in the form SO₄) from Lake Kipyashchee is 10 and 5.4 t/day, respectively. The first ever estimate of the total diffusion output of carbon dioxide from the surface of Lake Kipyashchee is over 5.4 t/day. The geochemical data acquired during the 2020–2021 field surveys indicate an increase (compared with 2015) in the hydrothermal activity in the Golovnin caldera.</p>","PeriodicalId":56112,"journal":{"name":"Journal of Volcanology and Seismology","volume":"17 1","pages":"1 - 16"},"PeriodicalIF":0.7,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4780437","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}