Relationship between water level temporal changes and seismicity in the Mingechevir reservoir (Azerbaijan)

2020 ◽  
Author(s):  
Fakhraddin Gadirov (Kadirov) ◽  
Luciano Telesca ◽  
Gulam Babayev ◽  
Gurban Yetirmishli ◽  
Rafig Safarov
Keyword(s):  
Water Level ◽  
Induced Seismicity ◽  
Singular Spectrum Analysis ◽  
Water Reservoir ◽  
Temporal Variations ◽  
Average Width ◽  
North West ◽  
Reservoir Induced Seismicity ◽  
The North ◽  
Annual Periodicity

<p>Reservoir-induced seismicity has been studied worldwide due to its potential to provoke damage to buildings and constructions, and, more important, human loss. Reservoir-induced seismicity (RIS) is normally related with additional static loading (the weight of the water reservoir and its seasonal variations), tectonic faults, liquefaction and pore pressure variations.The Mingechevir reservoir is located in the north-west of Azerbaijan on the Kurriver. This water reservoir is extended from north-west towards south-east through Kur river valley by 75 km. The area of the dam is 625 km<sup>2</sup> with the average width accounting for 6-8 km. The volume of the dam is 16 km<sup>3</sup>. The dam filling started in 1953. This reservoir is the largest one in the Caucasus and carries a number of geo-hazards interrelated with geodynamics and technogenic factors. The aim of the present study in the Mingechevir reservoir is to investigate relationship between the fluctuations of the water level and the onset of seismicity in the area around the dam more in detail, by using several and independent statistical methods.The temporal variations of the instrumental seismicity (0.5≤M<sub>L</sub>≤3.5) recorded in the Mingechevir area (Azerbaijan) between January 2010 to April 2018 and its relationship with the level variation of the water reservoir was analysed in this study. Due to the relative high completeness magnitude (M<sub>C</sub> = 1.6) of the seismic catalogue of the area, only 136 events were selected over a period of more than 8 years. Thus, the monthly number of events was analysed by using the correlogram-based periodogram, the singular spectrum analysis (SSA) and the empirical mode decomposition (EMD), which are robust against the short size of the time series. Our results point out to the following findings: 1) annual periodicity was found in one SSA reconstructed component of the monthly number of events; 2)quasi-annual periodicity was found in one EMD intrinsic mode function of the monthly number of earthquakes. These obtained results could support in a rigorously statistical manner that the seismicity occurring in Minghechevir area could be triggered by the yearly cycle of the water level of the reservoir.</p><p> </p><p><strong>Keywords:</strong>water reservoir, induced seismicity, water level change, Mingechevir reservoir, Azerbaijan</p>

Reservoir-Induced Seismicity in the Three Gorges Reservoir Area

2014 ◽  
Vol 501-504 ◽  
pp. 1477-1485
Author(s):  
Su Mei Liu ◽  
Xiang Dong Xie
Keyword(s):  
Water Level ◽  
Induced Seismicity ◽  
Three Gorges Reservoir ◽  
Three Gorges Reservoir Area ◽  
Three Gorges ◽  
Low Level ◽  
The Three Gorges Reservoir ◽  
Reservoir Induced Seismicity ◽  
The Three Gorges ◽  
Pressure Diffusion

As a region with little or very low level background seismicity, the impoundment of the Three Gorges Reservoir in June 2003 was related to increasing reservoir-induced seismicity. Analysis of the spatial pattern of seismicity showed that a majority of the seismicity was associated with the heavily fractured, deep crustal Jiuwanxi Fault, especially in regions of permeable Carbonate rocks formations. Analysis of the temporal pattern of the seismicity and a comparison with the filling history of the reservoir showed that the frequency and intensity of induced seismicity started at low level accompanying the impoundment of the Three Gorges Reservoir, and then increased with the increasing of water level and decreased thereafter. The amplitude of fluctuation of water level was found to be related to the frequency and intensity of induced seismicity. The pore pressure diffusion plays an important role in reservoir induced seismicity.

scholarly journals Structural interpretation of lineaments using satellite image processing: A case study in the vicinity of the Charvak reservoir

2020 ◽  
Vol 26 (2) ◽  
pp. 436-442
Author(s):  
Lola Sichugova ◽  
Dilbarkhon Fazilova
Keyword(s):  
Water Level ◽  
Satellite Images ◽  
Satellite Image ◽  
Water Reservoir ◽  
Water Level Fluctuations ◽  
Landsat 8 ◽  
Base Line ◽  
The North ◽  
Automated Method ◽  
Density Maps

This work presents the results of lineaments interpretation using the automated method of the satellite images in the territory of the Charvak water reservoir in Uzbekistan. Tectonic and local (water impoundment in Charvak reservoir) features of the region deformation were determined on base LINE algorithm in software PCI Geomatica. The thematic map with the geospatial arrangement of lineaments was constructed on base of satellite images LANDSAT-8 processing. We concluded that water level fluctuations have a greater influence on the appearance of the lineaments structure than periods of water filling and downstream in the reservoir. Lineament density maps showed dominantly increased density towards the north-southern direction is due to tectonic features of the region and the west-eastern direction is due to water level fluctuations in the reservoir. The lineaments density maps for summer-autumn periods showed the faults arising from water level fluctuations only. Winter-spring period affected with high influence of the seasonal (snow pack, rainfall) processes as well.

Fluorescence application to hydrocarbon monitoring in North West Shelf marine waters

2015 ◽  
Vol 55 (1) ◽  
pp. 345
Author(s):  
Felicity Harrison ◽  
Riley McAuliffe ◽  
Jose Romero ◽  
Keith Stubbs ◽  
Carolyn Oldham
Keyword(s):  
Standard Procedure ◽  
Cost Effective ◽  
Temporal Variations ◽  
Fluorescent Properties ◽  
Marine Waters ◽  
North West ◽  
Hydrocarbon Detection ◽  
Background Fluorescence ◽  
The North ◽  
Effective Manner

The application of fluorometry to hydrocarbon detection in marine waters is a standard procedure in many parts of the world. This technology is advantageous because spatial and temporal variations in hydrocarbon distributions can be acquired readily and rapidly in a cost-effective manner compared to traditional sampling methods. Its application to North West Shelf marine waters has been examined through two recent research studies. In the first study, the fluorescent properties of North West Shelf hydrocarbons were compared to those from North America. In general, peak fluorescence of North West Shelf samples are lower than North American and European hydrocarbons. Hence, fluorometer specifications (e.g. excitation and emission wavelengths) need to be tailored for hydrocarbon detection within North West Shelf waters. The second study measured low background fluorescence of a representative region of the North West Shelf using the fluorometer specifications recommended in the first study. This indicates that background fluorescence is unlikely to affect hydrocarbon detection in the marine waters of the North West Shelf. These studies support the use of fluorometry as a technique to reliably detect and to monitor unplanned (e.g. spills) and planned (e.g. producted formation water) hydrocarbon discharges across the North West Shelf.

Long-term changes of four macrobenthic assemblages from 1978 to 1992

1997 ◽  
Vol 77 (2) ◽  
pp. 287-310 ◽  
Author(s):  
J.M. Fromentin ◽  
F. Ibanez ◽  
J.C. Dauvin ◽  
J.M. Dewarumez ◽  
B. Elkaim
Keyword(s):  
Fine Sand ◽  
Temporal Variations ◽  
Local Conditions ◽  
North West ◽  
The North ◽  
Macrobenthic Assemblages ◽  
Climatic Event ◽  
Comparison Of The Results ◽  
The Impact

Changes in four macrobenthic assemblages of the muddy-fine sand Abra alba community along the north-west French coast were compared using several numerical analyses (distogram, Eigen vector filtering, clustering and multi-dimensional scaling). The faunistic composition of these four assemblages continuously changed during the 1978–1992 period. These modifications are characterized by more or less rapid and abrupt successions of distinct groups of species, but the amplitude and the frequency of these changes are different between sites. Comparison of the results provided by different analyses also reveal that these four macrobenthic assemblages did not fluctuate in parallel, and that local conditions might play a key role on their temporal variations. However, it is shown that a major mesoscale climatic event, the alternation of mild and cold periods, probably also influenced the temporal variations of these four macrobenthic assemblages. Thus it is likely that there is a combination of both local and mesoscale events influencing these communities. In certain cases, changes in local conditions were the major source of variations. Sometimes the impact of the mesoscale conditions was more apparent, especially at the northern sites where the amplitude of the variations of temperature was greater.

Auroral omega bands are a significant cause of large geomagnetically induced currents

2020 ◽  
Author(s):  
Sergey Apatenkov ◽  
Vyacheslav Pilipenko ◽  
Evgeniy Gordeev ◽  
Ari Viljanen ◽  
Liisa Juusola ◽  
...  
Keyword(s):  
Current System ◽  
Temporal Variations ◽  
Azimuthal Direction ◽  
Geomagnetically Induced Currents ◽  
North West ◽  
Vortex Pairs ◽  
The North ◽  
Defense Meteorological Satellite Program ◽  
Induced Currents ◽  
Meteorological Satellite

<p>The strongest event of geomagnetically induced currents (GIC) detected by the North-West Russian GIC network occurred during the main phase of the magnetic storm on June 28-29, 2013. Extremely high values, 120 A, were recorded in the 330 kV transformers on Kola Peninsula in the 04--07 magnetic local time (MLT) sector. The Defense Meteorological Satellite Program (DMSP) spacecraft took a sequence of ultraviolet (UV) auroral images in the southern hemisphere and observed multiple omega bands. The ionospheric equivalent electric currents based on the International Monitor for Auroral Geomagnetic Effects (IMAGE) magnetometer network reveal a sequence of current vortex pairs moving eastward with the speed of 0.5-2.5 km/s, that fits to the electrodynamics scheme of omega bands. Although the temporal variations of the associated current system are slow, the omega bands can be responsible for strong magnetic variations and GIC due to fast propagations of currents in the azimuthal direction.  The first steps towards the statistica study of the highest GIC recorded at Vykhodnoy transformer show that about 50% of events have properties similar to the comprehensively studied 29 June 2013 case.</p>

Changes in Pipeline Embedment due to Sediment Mobility: Observations and Implications for Design

2013 ◽  
Author(s):  
Antonio Borges Rodriguez ◽  
M. Fraser Bransby ◽  
Ian M. S. Finnie ◽  
Han Eng Low ◽  
David J. White
Keyword(s):  
Detailed Examination ◽  
Temporal Variations ◽  
Data Set ◽  
Offshore Pipelines ◽  
North West ◽  
The North ◽  
New Information ◽  
Calculation Methodology ◽  
Industry Practice ◽  
Sediment Mobility

This paper describes temporal variations in embedment of several existing pipelines on the North-West Shelf (NWS) of Australia, and the sediment mobility processes that cause them. Distinct and explainable patterns in the extent, distribution and rate of the development of pipeline embedment have been revealed through systematic detailed examination of repeated annual integrity surveys by ROV. This represents a unique data-set that has been used to optimize the reliability of a newly designed pipeline. This paper explains why these clear findings should not be overlooked in both the buckling and stability design of initially unburied pipelines, which is in contrast to currently established industry practice. This new information supports the presumption that conventional approaches for calculating the hydrodynamic stability of unburied pipelines may be more conservative than necessary. Conversely, and arguably more importantly, it is shown that conventionally accepted methods for calculating pipe-seabed resistance forces when planning buckling schemes should be considered unsafe if embedment due to sediment mobility is possible. Consequently, this paper proposes an innovative calculation methodology that statistically captures these sediment mobility effects, and which facilitates a more justifiable geotechnical input to pipeline engineering than what is conventionally adopted. This methodology is currently being used by the authors as a state-of-the-art design practice for unburied offshore pipelines in regions of sediment mobility.

SEM and TEM observations of sperm development in the testis of the freshwater fish Oreochromis mossambicus

1990 ◽  
Vol 48 (3) ◽  
pp. 58-59
Author(s):  
Daryl A. Cornish ◽  
George L. Smit
Keyword(s):  
Morphological Characteristics ◽  
Oreochromis Mossambicus ◽  
Breeding Cycle ◽  
Limited Information ◽  
North West ◽  
The North ◽  
Sem And Tem ◽  
Sperm Development ◽  
Ultrastructural Characteristics ◽  
The University

Oreochromis mossambicus is currently receiving much attention as a candidater species for aquaculture programs within Southern Africa. This has stimulated interest in its breeding cycle as well as the morphological characteristics of the gonads. Limited information is available on SEM and TEM observations of the male gonads. It is known that the testis of O. mossambicus is a paired, intra-abdominal structure of the lobular type, although further details of its characteristics are not known. Current investigations have shown that spermatids reach full maturity some two months after the female becomes gravid. Throughout the year, the testes contain spermatids at various stages of development although spermiogenesis appears to be maximal during November when spawning occurs. This paper describes the morphological and ultrastructural characteristics of the testes and spermatids.Specimens of this fish were collected at Syferkuil Dam, 8 km north- west of the University of the North over a twelve month period, sacrificed and the testes excised.

The North West Passage

2014 ◽  
Author(s):  
Roald Amundsen ◽  
Godfred Hansen
Keyword(s):  
North West ◽  
The North
Sign in / Sign up

Export Citation Format

Share Document