scholarly journals COMPLEX GEOLOGICAL-GEOPHYSICAL STUDIES OF THE UNDERWATER VOLCANO 7.10 (KURIL ISLAND ARC)

2021 ◽  
pp. 23-40
Author(s):  
Yu.I. Blokh ◽  
◽  
V.I. Bondarenko ◽  
A.S. Dolgal ◽  
P.N. Novikova ◽  
...  
Keyword(s):  
Lava Flow ◽  
Kuril Island ◽  
Volcanic Edifice ◽  
Island Arc ◽  
Lava Flows ◽  
Submarine Volcano ◽  
Magma Chambers ◽  
The North ◽  
Minimum Depth ◽  
Kuril Island Arc

Submarine volcano 7.10, which is part of the North Iturup group of submarine volcanoes of the Kuril island arc, was studied in 5 voyages of the research vessel Vulkanolog in 1982–1989. Comprehensive studies have shown that the edifice of the 7.10 submarine volcano is composed of rocks of a range from dacites to basalts. The summit and slopes of the volcano are devoid of sediments, and the base is overlain by a sedimentary stratum, thickness of which reaches 800 m. The minimum depth recorded above the top of the volcano is 210 m. In the volcanic edifice, subvertical, northeastern and northwestern feeder channels, as well as peripheral magma chambers at depths of 2.5–3.0 km, were identified. It is assumed that during the terminal eruption, small lava flows poured out in the northeast and southwest directions, while the main lava flow poured out in the southeast direction and reached the base of the volcanic edifice.

scholarly journals FIELDWORKS AT ALAID VOLCANO IN 2020, ATLASOV ISLAND, THE KURILES. PHASE 2

2020 ◽  
Vol 4(48) ◽  
pp. 108-113
Author(s):  
V.A. Rashidov ◽  
◽  
L.P. Anikin ◽  
Keyword(s):  
Kuril Island ◽  
Field Work ◽  
Island Arc ◽  
Second Phase ◽  
Phase 2 ◽  
Deep Part ◽  
The West ◽  
Rock Samples ◽  
The North ◽  
Kuril Island Arc

The second phase of field work in 2020 on the Alaid Volcano, located on Atlasov Island in the north of the Kuril Island Arc, was carried out on October 2. There was no snow in the crater at the time, and this made it possible to study the deep part of the crater and take samples of rocks and snow. The measurements of the temperature of fumarole gases showed that for the tested fumaroles it varied in the range of 35° to 95° C. Rock samples were also taken from the Svechka Rock and at Cape Shtormovoy. It was found that there is currently no water in Yuryev Creek, located in the west-northwest part of Atlasov Island. The studies carried out have made it possible to obtain new unique information, which will undoubtedly be useful to various researchers of active volcanoes in the Kuril island arc.

Magmatic sources of quaternary lavas in the Kuril island arc: New data on Sr and Nd isotopy

2007 ◽  
Vol 417 (1) ◽  
pp. 1206-1211 ◽  
Author(s):  
Yu. A. Martynov ◽  
J. -I. Kimura ◽  
A. I. Khanchuk ◽  
A. V. Rybin ◽  
A. A. Chashchin ◽  
...  
Keyword(s):  
Kuril Island ◽  
Island Arc ◽  
Kuril Island Arc

Revealing of surface deformations induced by geodynamic processes in the Kuril island arc from GNSS data

2020 ◽  
Author(s):  
Yurii Gabsatarov ◽  
Irina Vladimirova ◽  
Grigory Steblov ◽  
Leopold Lobkovsky ◽  
Ksenia Muravieva
Keyword(s):  
Time Series ◽  
Kuril Island ◽  
Block Structure ◽  
Island Arc ◽  
Transient Processes ◽  
Automatic Process ◽  
Surface Deformations ◽  
Gnss Data ◽  
Kuril Island Arc

<p>Kuril subduction zone is one of the most active continental margins due to the high plate convergence rate. Latest oceanographical, seismological and geological studies show a block structure of the Kuril island arc. In 2006-2008 Kuril GNSS network was installed along the island arc to provide information on the dynamics of the continental margin. Proper geodetic characterization of surface deformations in Kuril region is necessary for studies of regional geodynamical processes associated with seismic cycles and the evolution of the subduction zone. Since Kuril network has some disadvantages such as small amount of continuous stations (cGNSS) and its near-linear arrangement, special attention must be paid to correct processing of the GNSS data to exclude miscalculations that can affect further modeling of regional geodynamical processes.</p><p>We use regression analysis of time series of cGNSS stations displacements to distinguish components which are related to: 1) long-term accumulation of elastic stresses (secular velocity); 2) almost instant release of substantial part of accumulated stresses during main shock (coseismic offsets); 3) transient processes following large subduction eartquakes. The main advantages of the proposed regression analysis algorithm are: 1) an automatic process for detecting coseismic displacements, based on direct modeling of surface deformations using a dislocation model, 2) an automatic process for identifying transient processes; 3) taking into account the realistic GNSS noise model in calculating errors.</p><p>Since most of the GNSS stations were deployed only after large 2006-2007 Simushir earthquakes their time series were affected by intense and long-term postseismic transient processes such as afterslip and viscoelastic relaxation in the upper mantle. We use our direct models of these postseismic processes to construct residual time series, which allows us to estimate magnitudes of seasonal periodic signal and to calculate realistic errors.</p><p>We use correlation-based clustering algorithm to identify the influence of block structure of island arc on observed deformation patterns during interseismic, coseismic and postseismic stages of the seismic cycle. We also check our processing of GNSS data by constructing model of slip distribution in the source of 2006 Simushir earthquake on the basis of our estimates of coseismic offsets and by comparing our model with previous ones obtained on the basis of satellite geodetic data. The performed analysis of continuous GNSS observations shows that different parts of Kuril island arc are at different stages of seismic cycle.</p>

THE EVOLUTION OF MAGMATISM IN THE LESSER KURIL RIDGE OF THE KURIL ISLAND-ARC SYSTEM

1986 ◽  
Vol 28 (2) ◽  
pp. 180-196 ◽  
Author(s):  
A. A. Tsvetkov ◽  
G. I. Govorov ◽  
M. V. Tsvetkova ◽  
M. M. Arakelyants
Keyword(s):  
Kuril Island ◽  
Island Arc ◽  
Kuril Ridge ◽  
Kuril Island Arc ◽  
Lesser Kuril Ridge

Genesis and Nd Isotope Composition of Ferromanganese Deposits of the Sea of Okhotsk and the Kuril Island Arc

2021 ◽  
Vol 62 (9) ◽  
pp. 1074-1087
Author(s):  
P.E. Mikhailik ◽  
I.A. Vishnevskaya ◽  
E.V. Mikhailik ◽  
M.G. Blokhin ◽  
M.V. Chervyakovskaya ◽  
...  
Keyword(s):  
Sea Of Okhotsk ◽  
Kuril Island ◽  
Isotope Composition ◽  
Island Arc ◽  
Deryugin Basin ◽  
Nd Isotope ◽  
The Sea Of Okhotsk ◽  
Ferromanganese Deposits ◽  
Nd Isotope Composition ◽  
Kuril Island Arc

Abstract —The Nd isotope composition of ferromanganese deposits (FMD) from the central part of the Sea of Okhotsk and the Kuril island arc has been studied. The results showed that diagenetic samples from the Deryugin Basin have a heterogeneous Nd isotope composition. The positive εNd values here might be both due to the input of a terrigenous impurity and due to diffuse endogenetic element supply. The FMD samples from the Sonne underwater ridge show a εNd value specific to seawater (–3.2). The εNd value of hydrogenetic FMD from Volcano 7.14 is –3.4, which corresponds to the εNd value of the Pacific water. The FMD samples from Volcano 5.5 are characterized by εNd = –2.0. The higher εNd value might be due to a moderate dilution of the hydrothermal fluid by seawater and might also indicate the presence of volcanic fragments in the FMD samples. The highest εNd value (+4.4) has been established for volcaniclastic sandstone saturated with Fe and Mn hydroxides. It points to a mixing of volcanomictic and hydrothermal materials.

III.—Notes on the North-Western Region of Charnwood Forest

1915 ◽  
Vol 2 (12) ◽  
pp. 545-554 ◽  
Author(s):  
T. G. Bonney
Keyword(s):  
Lava Flow ◽  
Lava Flows ◽  
Geological Survey ◽  
Western Region ◽  
Fine Grained ◽  
The Third ◽  
The North ◽  
North Western

Charnwood Forest, since 1891, the date of the last paper by Canon E. Hill and myself, has been investigated by the Geological Survey. Though part of their map and the accompanying memoir have not yet been published, the general results of their work have been announced by Professor W. W. Watts, by whom most of it was executed. As we stated at the time, we were far from being satisfied with some important points in our own conclusions; so that since my return to Cambridge I have studied my specimens and slices from the north-western region, which had presented to us the more serious difficulties. In 1891 I had been led to regard the characteristic rocks of Peldar Tor and High Sharpley as lava-flows, but considered the dominant rocks of Bardon Hill to be mainly pyroclastic. Professor Watts, however, maintained the intrusive character of the first and second, while taking the same view as myself about the third. The lava-flow hypothesis had appeared to me the more probable, because I doubted whether a mass so large as the Peldar-Bardon porphyroid, if intrusive, could have maintained throughout a texture so uniformly fine-grained, and I had found in the Bardon quarries fragments of it embedded in rock which I then supposed to be a somewhat altered tuff, closely related to the High Sharpley lava.

scholarly journals Gas Emissions From Volcanoes of the Kuril Island Arc (NW Pacific): Geochemistry and Fluxes

2018 ◽  
Vol 19 (6) ◽  
pp. 1859-1880 ◽  
Author(s):  
Yuri Taran ◽  
Mikhail Zelenski ◽  
Ilya Chaplygin ◽  
Natalia Malik ◽  
Robin Campion ◽  
...  
Keyword(s):  
Kuril Island ◽  
Island Arc ◽  
Gas Emissions ◽  
Kuril Island Arc
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