Pub Date : 2022-01-01DOI: 10.30730/gtrz.2022.6.1.060-073
T. G. Koreneva, L. Sigareva
The data of spectrophotometric determination of the content of plant pigments in the bottom sediments of Aniva bay (the Sea of Okhotsk) obtained in autumn 2013 are presented. The content of sedimentary pigments is shown to be quantitatively related to the hydrological characteristics of the water column and the typological indicators of bottom sediments. The content of chlorophyll a with phaeopigments in the sediments of the bay is generally characterized by values of the oligotrophic category. The pigment characteristics of the bottom sediments of the bay are represented by the values of indicators that differ significantly from those of functioning plant organisms due to the strong degradation of the pigment fund. The prevalence of the concentration of phaeopigments over chlorophyll a, an increase in the contribution of additional chlorophylls to their total amount, as well as an increase in total carotenoids compared to chlorophyll a were noted. The ecological interpretation of the data obtained on pigments and pigment ratios gives an idea of the mechanism of interaction between production and destruction processes in water bodies, which gives to the pigment characteristics meaning of integral ecosystem indicators.
{"title":"Pigments in the bottom sediments of Aniva Bay (Sea of Okhotsk)","authors":"T. G. Koreneva, L. Sigareva","doi":"10.30730/gtrz.2022.6.1.060-073","DOIUrl":"https://doi.org/10.30730/gtrz.2022.6.1.060-073","url":null,"abstract":"The data of spectrophotometric determination of the content of plant pigments in the bottom sediments of Aniva bay (the Sea of Okhotsk) obtained in autumn 2013 are presented. The content of sedimentary pigments is shown to be quantitatively related to the hydrological characteristics of the water column and the typological indicators of bottom sediments. The content of chlorophyll a with phaeopigments in the sediments of the bay is generally characterized by values of the oligotrophic category. The pigment characteristics of the bottom sediments of the bay are represented by the values of indicators that differ significantly from those of functioning plant organisms due to the strong degradation of the pigment fund. The prevalence of the concentration of phaeopigments over chlorophyll a, an increase in the contribution of additional chlorophylls to their total amount, as well as an increase in total carotenoids compared to chlorophyll a were noted. The ecological interpretation of the data obtained on pigments and pigment ratios gives an idea of the mechanism of interaction between production and destruction processes in water bodies, which gives to the pigment characteristics meaning of integral ecosystem indicators.","PeriodicalId":34500,"journal":{"name":"Geosistemy perekhodnykh zon","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69578655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.30730/gtrz.2022.6.3.256-276
K. Shvidskaya, A. Kopanina
The methods of remote sensing of the Earth, due to their efficiency and information content, are widely used to research vegetation dynamics and monitor volcanic activity. The purpose of this work is to research the dynamics of the mud volcanic landscapes and vegetation cover of the Yuzhno-Sakhalinsk mud volcano, as well as its eruption, using Earth remote sensing data. The total area of the study area is 11.5 km2. The work was done in QGIS 3.16 program using Sentinel-2B satellite image, images from Google Earth program and graphic maps of the study area created by O.A. Melnikov and V.V. Ershov. An updated large-scale schematic map of the Yuzhno-Sakhalinsk mud volcano has been created, displaying all known volcanic eruption fields over the last 70 years, modern and extinct eruptive centers. A semi-automatic classification of the Sentinel-2B satellite image was carried out using the methods of supervised and unsupervised classification using the Semi-Automatic Classification Plugin module. Based on the results of two types of classification, the areas of vegetation classes of the study area were calculated and two maps of the vegetation cover of the Yuzhno-Sakhalinsk mud volcano were created on a scale of 1 : 50 000 as of 2018. The maps need to be refined, but they can already be used to analyze the dynamics of the vegetation cover of the study area. In our opinion, it is more expedient to apply unsupervised classification before conducting a field survey of the area of interest, and supervised classification after. The practical significance of satellite monitoring of the Yuzhno-Sakhalinsk mud volcano lies in the ability to quickly monitor its activity, assess the recreational load and study the impact of volcano activity on vegetation and the landscape as a whole.
{"title":"Large-scale mapping of the vegetation of the Yuzhno-Sakhalinsk mud volcano and the adjacent landscape (Sakhalin Island) using satellite data","authors":"K. Shvidskaya, A. Kopanina","doi":"10.30730/gtrz.2022.6.3.256-276","DOIUrl":"https://doi.org/10.30730/gtrz.2022.6.3.256-276","url":null,"abstract":"The methods of remote sensing of the Earth, due to their efficiency and information content, are widely used to research vegetation dynamics and monitor volcanic activity. The purpose of this work is to research the dynamics of the mud volcanic landscapes and vegetation cover of the Yuzhno-Sakhalinsk mud volcano, as well as its eruption, using Earth remote sensing data. The total area of the study area is 11.5 km2. The work was done in QGIS 3.16 program using Sentinel-2B satellite image, images from Google Earth program and graphic maps of the study area created by O.A. Melnikov and V.V. Ershov. An updated large-scale schematic map of the Yuzhno-Sakhalinsk mud volcano has been created, displaying all known volcanic eruption fields over the last 70 years, modern and extinct eruptive centers. A semi-automatic classification of the Sentinel-2B satellite image was carried out using the methods of supervised and unsupervised classification using the Semi-Automatic Classification Plugin module. Based on the results of two types of classification, the areas of vegetation classes of the study area were calculated and two maps of the vegetation cover of the Yuzhno-Sakhalinsk mud volcano were created on a scale of 1 : 50 000 as of 2018. The maps need to be refined, but they can already be used to analyze the dynamics of the vegetation cover of the study area. In our opinion, it is more expedient to apply unsupervised classification before conducting a field survey of the area of interest, and supervised classification after. The practical significance of satellite monitoring of the Yuzhno-Sakhalinsk mud volcano lies in the ability to quickly monitor its activity, assess the recreational load and study the impact of volcano activity on vegetation and the landscape as a whole.","PeriodicalId":34500,"journal":{"name":"Geosistemy perekhodnykh zon","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69579289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.30730/gtrz.2022.6.1.013-018.018-023
A. Degterev, M. Chibisova
The article considers a short-term moderate explosive eruption of Chikurachki volcano (Paramushir Isl.) on the basis of satellite data. In the period from January 30 to February 3, 2022, at least 8 steam-gas and ash emissions to a height of 2.5–5 km a.s.l. were recorded. Ash plumes and clouds spread mainly in the south-western, western, southern, and south-eastern directions at a distance up to 250 km from the volcano. Its parameters were similar to the previous explosive eruptions of Chikurachki volcano. Due to high frequency of moderate explosive eruptions of Chikurachki volcano in recent years, when ash clouds rise to a height up to 7.5 km a.s.l. and ash plumes are formed that can spread for several hundred kilometers, the volcano poses a potential hazard to international and local airlines.
{"title":"The activity of Chikurachki volcano (Paramushir Isl., Northern Kuriles) in January–February of 2022","authors":"A. Degterev, M. Chibisova","doi":"10.30730/gtrz.2022.6.1.013-018.018-023","DOIUrl":"https://doi.org/10.30730/gtrz.2022.6.1.013-018.018-023","url":null,"abstract":"The article considers a short-term moderate explosive eruption of Chikurachki volcano (Paramushir Isl.) on the basis of satellite data. In the period from January 30 to February 3, 2022, at least 8 steam-gas and ash emissions to a height of 2.5–5 km a.s.l. were recorded. Ash plumes and clouds spread mainly in the south-western, western, southern, and south-eastern directions at a distance up to 250 km from the volcano. Its parameters were similar to the previous explosive eruptions of Chikurachki volcano. Due to high frequency of moderate explosive eruptions of Chikurachki volcano in recent years, when ash clouds rise to a height up to 7.5 km a.s.l. and ash plumes are formed that can spread for several hundred kilometers, the volcano poses a potential hazard to international and local airlines.","PeriodicalId":34500,"journal":{"name":"Geosistemy perekhodnykh zon","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69578526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.30730/gtrz.2022.6.2.130-135
A. Degterev, D. Kozlov, O.R. Hubaeva, A. Khomchanovskiy
Within the framework of a joint scientific expedition, for the first time, the staff of IVS FEB RAS and IMGG FEB RAS obtained the data on the morphological appearance and morphometric parameters of the basin of Lake Utko-Banya, which is not marked on the existing maps, temperature and chemical composition of the lake waters. Gas-hydrotherms discharged along the dike of Konakova сape have been examined.
在一次联合科学考察的框架内，IVS FEB RAS和IMGG FEB RAS的工作人员首次获得了在现有地图上没有标记的Utko-Banya湖流域的形态外观和形态计量参数数据，以及湖水的温度和化学成分。研究了沿科纳科娃河堤防排放的气液热液。
{"title":"Expedition to study new thermal manifestations on Iturup Island in 2022","authors":"A. Degterev, D. Kozlov, O.R. Hubaeva, A. Khomchanovskiy","doi":"10.30730/gtrz.2022.6.2.130-135","DOIUrl":"https://doi.org/10.30730/gtrz.2022.6.2.130-135","url":null,"abstract":"Within the framework of a joint scientific expedition, for the first time, the staff of IVS FEB RAS and IMGG FEB RAS obtained the data on the morphological appearance and morphometric parameters of the basin of Lake Utko-Banya, which is not marked on the existing maps, temperature and chemical composition of the lake waters. Gas-hydrotherms discharged along the dike of Konakova сape have been examined.","PeriodicalId":34500,"journal":{"name":"Geosistemy perekhodnykh zon","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69579040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.30730/gtrz.2022.6.3.145-164.164-182
L. Bogomolov, N. Sycheva
The review presents the most important results of investigations in the field of strong earthquakes predictions, which were published in scientific sources. The ways of further studies of seismic prognosis problem are involved into consideration, as well as the based theoretical model, to improve predictive methods and algorithms. One can follow the research transformation from initial (historical) articulation of this intriguing problem to its current state of the art, including modern approaches based on the data of seismological and geophysical monitoring, and as well as ionospheric and atmospheric surveys. Examples of successful earthquake predictions have been discussed and treated from viewpoint of the potential of used methods, at least for some regions (for example, Sakhalin and Kamchatka). It is assumed that the predictions, which were realized due to certain algorithms and/or working precursors rather than random guessing, are able to weaken the pessimist side in the discussion: are earthquakes predictable or unpredictable in principle.
{"title":"Earthquake predictions in XXI century: prehistory and concepts, precursors and problems","authors":"L. Bogomolov, N. Sycheva","doi":"10.30730/gtrz.2022.6.3.145-164.164-182","DOIUrl":"https://doi.org/10.30730/gtrz.2022.6.3.145-164.164-182","url":null,"abstract":"The review presents the most important results of investigations in the field of strong earthquakes predictions, which were published in scientific sources. The ways of further studies of seismic prognosis problem are involved into consideration, as well as the based theoretical model, to improve predictive methods and algorithms. One can follow the research transformation from initial (historical) articulation of this intriguing problem to its current state of the art, including modern approaches based on the data of seismological and geophysical monitoring, and as well as ionospheric and atmospheric surveys. Examples of successful earthquake predictions have been discussed and treated from viewpoint of the potential of used methods, at least for some regions (for example, Sakhalin and Kamchatka). It is assumed that the predictions, which were realized due to certain algorithms and/or working precursors rather than random guessing, are able to weaken the pessimist side in the discussion: are earthquakes predictable or unpredictable in principle.","PeriodicalId":34500,"journal":{"name":"Geosistemy perekhodnykh zon","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69579115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.30730/gtrz.2022.6.3.277-282
Y. Poltev, T. G. Koreneva, V. E. Maryzhikhin
The data on atomic absorption determination of the content of trace elements in the tissues and organs of some invertebrate species sampled in January 2021 from the by-catch in the Eleginus gracilis fishery in the Terpeniya Bay, the Sea of Okhotsk are presented. The concentrations of toxic normalized trace elements (As, Pb, Cd) in commercial species are shown not to exceed the permissible levels.
{"title":"The content of trace elements in some invertebrate species from the Terpeniya Bay, the Sea of Okhotsk","authors":"Y. Poltev, T. G. Koreneva, V. E. Maryzhikhin","doi":"10.30730/gtrz.2022.6.3.277-282","DOIUrl":"https://doi.org/10.30730/gtrz.2022.6.3.277-282","url":null,"abstract":"The data on atomic absorption determination of the content of trace elements in the tissues and organs of some invertebrate species sampled in January 2021 from the by-catch in the Eleginus gracilis fishery in the Terpeniya Bay, the Sea of Okhotsk are presented. The concentrations of toxic normalized trace elements (As, Pb, Cd) in commercial species are shown not to exceed the permissible levels.","PeriodicalId":34500,"journal":{"name":"Geosistemy perekhodnykh zon","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69579294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.30730/gtrz.2022.6.1.054-059
A. Borisov
During construction and reconstruction of ports, they are guided by the calculated characteristics of wind waves, storm surges, low-frequency oscillations of water areas (seiches). However, the correct determination of characteristics is impossible without taking into account field observations of sea waves in a particular port under different conditions. This work supplements the existing data on wave characteristics in the main port of Sakhalin Island on the basis of sea level measurements carried out in 2007. The main characteristics of sea waves in the port area were estimated: amplitudes of sea surface oscillations, peak components of the wave energy spectrum and the corresponding periods of oscillations. In this case, the peak components were determined in the range of periods from wind waves to low-frequency seiche oscillations. Storm situations and calm sea conditions were analyzed. The resonant nature of oscillations is shown. It has been established that in calm weather the peak components in the energy spectrum are concentrated in the region of the zero mode of natural oscillations in the port corresponding to 500 s. In the most active phase of storms, the peak component manifests itself mainly near the period of 8 s, and at the beginning and end of the storm it is near the period of 182 s, corresponding to the first mode of natural oscillations. The analysis of peak spectral components in a wide range of periods allows us tracing the dynamics of sea waves in the port and the process of build-up of seiche oscillations.
{"title":"Sea wave characteristics in the port of Kholmsk (Sakhalin Island)","authors":"A. Borisov","doi":"10.30730/gtrz.2022.6.1.054-059","DOIUrl":"https://doi.org/10.30730/gtrz.2022.6.1.054-059","url":null,"abstract":"During construction and reconstruction of ports, they are guided by the calculated characteristics of wind waves, storm surges, low-frequency oscillations of water areas (seiches). However, the correct determination of characteristics is impossible without taking into account field observations of sea waves in a particular port under different conditions. This work supplements the existing data on wave characteristics in the main port of Sakhalin Island on the basis of sea level measurements carried out in 2007. The main characteristics of sea waves in the port area were estimated: amplitudes of sea surface oscillations, peak components of the wave energy spectrum and the corresponding periods of oscillations. In this case, the peak components were determined in the range of periods from wind waves to low-frequency seiche oscillations. Storm situations and calm sea conditions were analyzed. The resonant nature of oscillations is shown. It has been established that in calm weather the peak components in the energy spectrum are concentrated in the region of the zero mode of natural oscillations in the port corresponding to 500 s. In the most active phase of storms, the peak component manifests itself mainly near the period of 8 s, and at the beginning and end of the storm it is near the period of 182 s, corresponding to the first mode of natural oscillations. The analysis of peak spectral components in a wide range of periods allows us tracing the dynamics of sea waves in the port and the process of build-up of seiche oscillations.","PeriodicalId":34500,"journal":{"name":"Geosistemy perekhodnykh zon","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69578645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.30730/gtrz.2022.6.4.303-315.316-327
R. Bulgakov
The paper attempts to answer the question about the role of contribution of the hydroisostasy to the stress-strain state of the Earth’s crust on the Island of Sakhalin. The hydroisostasy contribution was estimated by simulation by means of finite element method. The mesh grid for the calculation was constructed using the real values of the depth of the Moho discontinuity surface and the topography of Sakhalin Island with adjacent shelf areas. The calculation took into account the Central Sakhalin fault zone. Lateral displacements as a result of strain and lateral displacements combined with vertical ones were simulated separately. Comparison of the results of the stress-strain state simulation, taking lateral displacements and their combination with vertical ones into account, clearly demonstrates the significance of the hydroisostasy contribution to the stress-strain state of the Earth’s crust in the Sakhalin region.
{"title":"Modeling of the stress-strain condition of the Earth’s crust of Sakhalin Island: impact of hydroisostasy","authors":"R. Bulgakov","doi":"10.30730/gtrz.2022.6.4.303-315.316-327","DOIUrl":"https://doi.org/10.30730/gtrz.2022.6.4.303-315.316-327","url":null,"abstract":"The paper attempts to answer the question about the role of contribution of the hydroisostasy to the stress-strain state of the Earth’s crust on the Island of Sakhalin. The hydroisostasy contribution was estimated by simulation by means of finite element method. The mesh grid for the calculation was constructed using the real values of the depth of the Moho discontinuity surface and the topography of Sakhalin Island with adjacent shelf areas. The calculation took into account the Central Sakhalin fault zone. Lateral displacements as a result of strain and lateral displacements combined with vertical ones were simulated separately. Comparison of the results of the stress-strain state simulation, taking lateral displacements and their combination with vertical ones into account, clearly demonstrates the significance of the hydroisostasy contribution to the stress-strain state of the Earth’s crust in the Sakhalin region.","PeriodicalId":34500,"journal":{"name":"Geosistemy perekhodnykh zon","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69579333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.30730/gtrz.2021.5.4.399-427
I. Motylkova
The article provides the data on phytoperiphyton composition in the basin of the Lutoga River, which is an ecologically significant water course of Sakhalin Island. In result of surveying the estuary, main channel and tributaries of the Lyutoga River from February to December of 2011, the species composition of phytoperiphyton was identified, assemblage of dominant species was found, ecology-geographical characteristic (geographical distribution, habitat association, salinity, pH, saprobity) was described. The transformations of the species composition of phytoperiphyton were studied with distance from the estuarine zone to the upper reaches of the river. Algal flora was presented with 303 species and intraspecific taxa of microalgae and cyanobacteria belonged to 9 phyla, 16 classes, 40 orders, 65 families and 107 genera (annotated list see in the Appendix). It was based on diatoms, among which the leading families were Bacillariaceae and Naviculaceae, and the leading genera were Nitzschia and Navicula. For the first time, 34 species and intraspecific taxa of microalgae and cyanobacteria are indicated for inland water bodies of the Sakhalin region. With distance from the estuarine zone to the upper reaches of the river, the number of species, geographical groupings, planktonic forms, and alphamesosaprobiont species decreased. Mass development of Hannaea arcus f. recta were observed in the spring-summer period, Melosira varians and Rhoicosphenia abbreviata – in the autumn-winter.
本文介绍了库页岛生态重要河道卢托加河流域植物的浮游植物组成资料。2011年2 - 12月，通过对柳托加河河口、主河道和支流的调查，确定了柳托加河浮游植物的种类组成，发现了优势种的组合，描述了生态地理特征(地理分布、生境关联、盐度、pH值、酸碱度)。研究了植物附生植物种类组成随河口至上游距离的变化规律。藻类区系共发现微藻和蓝藻303种，种内分类群隶属于9门16纲40目65科107属(注表见附录)。以硅藻为基础，以硅藻科和硅藻科为主导科，以硅藻属和硅藻属为主导属。首次在库页岛内陆水体中发现了34个微藻和蓝藻种内分类群。随着河口与河流上游距离的增加，物种数量、地理类群、浮游生物形态和α -菌种类均呈减少趋势。在春夏季节，长角汉娜(Hannaea arcus f. recta)大量生长;在秋冬季节，长角马蹄莲(Melosira varians)和短红冠(Rhoicosphenia breviata -)大量生长。
{"title":"Taxonomic structure and ecology-geographical characteristic of phytoperiphyton in the Lyutoga River (Sakhalin Island)","authors":"I. Motylkova","doi":"10.30730/gtrz.2021.5.4.399-427","DOIUrl":"https://doi.org/10.30730/gtrz.2021.5.4.399-427","url":null,"abstract":"The article provides the data on phytoperiphyton composition in the basin of the Lutoga River, which is an ecologically significant water course of Sakhalin Island. In result of surveying the estuary, main channel and tributaries of the Lyutoga River from February to December of 2011, the species composition of phytoperiphyton was identified, assemblage of dominant species was found, ecology-geographical characteristic (geographical distribution, habitat association, salinity, pH, saprobity) was described. The transformations of the species composition of phytoperiphyton were studied with distance from the estuarine zone to the upper reaches of the river. Algal flora was presented with 303 species and intraspecific taxa of microalgae and cyanobacteria belonged to 9 phyla, 16 classes, 40 orders, 65 families and 107 genera (annotated list see in the Appendix). It was based on diatoms, among which the leading families were Bacillariaceae and Naviculaceae, and the leading genera were Nitzschia and Navicula. For the first time, 34 species and intraspecific taxa of microalgae and cyanobacteria are indicated for inland water bodies of the Sakhalin region. With distance from the estuarine zone to the upper reaches of the river, the number of species, geographical groupings, planktonic forms, and alphamesosaprobiont species decreased. Mass development of Hannaea arcus f. recta were observed in the spring-summer period, Melosira varians and Rhoicosphenia abbreviata – in the autumn-winter.","PeriodicalId":34500,"journal":{"name":"Geosistemy perekhodnykh zon","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69578460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.30730/gtrz.2021.5.3.192-208.208-222
Y. Rebetsky
This paper considers theoretical aspects of a trigger effect of earth tides on earthquake initiation under the LURR approach. The growth of Coulomb stress, which appears resulting from this phenomenon, is shown to occur not for all regimes of stress state acting in the studied region. Its greatest increase corresponds to the regime of the horizontal extension and shear associated with the faults with kinematics of the normal and strike-slip faults. The low level of additional Coulomb stress for the horizontal compression regime allows asserting the low probability of the trigger effect for the faults with kinematics of the reverse faults. It is noted, that there is also an indirect factor in the form of additional pressure caused by the sea tides in addition to the main factor of the earth tides effect on deformations in the solid earth for island arcs and coastal areas of the continental crust. This is an additional vertical pressure for the ocean floor, and a lateral pressure for the crust of island arcs and coastal areas of the continents. Indirect factors significantly complicate the effect of earth tides on the Earth’s crust, completely neutralizing the influence of the direct factor in some cases.
{"title":"Concerning the theory of LURR based deterministic earthquake prediction","authors":"Y. Rebetsky","doi":"10.30730/gtrz.2021.5.3.192-208.208-222","DOIUrl":"https://doi.org/10.30730/gtrz.2021.5.3.192-208.208-222","url":null,"abstract":"This paper considers theoretical aspects of a trigger effect of earth tides on earthquake initiation under the LURR approach. The growth of Coulomb stress, which appears resulting from this phenomenon, is shown to occur not for all regimes of stress state acting in the studied region. Its greatest increase corresponds to the regime of the horizontal extension and shear associated with the faults with kinematics of the normal and strike-slip faults. The low level of additional Coulomb stress for the horizontal compression regime allows asserting the low probability of the trigger effect for the faults with kinematics of the reverse faults. It is noted, that there is also an indirect factor in the form of additional pressure caused by the sea tides in addition to the main factor of the earth tides effect on deformations in the solid earth for island arcs and coastal areas of the continental crust. This is an additional vertical pressure for the ocean floor, and a lateral pressure for the crust of island arcs and coastal areas of the continents. Indirect factors significantly complicate the effect of earth tides on the Earth’s crust, completely neutralizing the influence of the direct factor in some cases.","PeriodicalId":34500,"journal":{"name":"Geosistemy perekhodnykh zon","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69578624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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