scholarly journals RSE-based flooding prediction within territories of closed coal mines of Ukraine

2021 ◽  
Vol 8 (1) ◽  
pp. 18-25
Author(s):  
Oleg Ulytsky ◽  
Kateryna Boiko
Keyword(s):  
Coal Mines ◽  
Vertical Surface ◽  
Groundwater Table ◽  
Coal Extraction ◽  
Surface Areas ◽  
The Earth ◽  
Surface Displacements ◽  
Mine Workings ◽  
Images Processing ◽  
Vertical Deformations

The article highlights the aspects of RSE technologies adaptation during the forward hydrogeological predictions development and for the purposes of the surface flooding zones spreading estimation within coal-mines fields, being flooded. Previously developed numerical geofiltration model allows to return filtration settings of the massif of rocks, that was broken due to coal extraction, and to identify the influence features of the mine workings flooding regime on the general hydrodynamic settings around the flooded mines. As a result of geofiltration modeling the forecast cartographic scheme of groundwater table level position at the final stage of mine workings flooding was obtained. To take into account the influence of surface subsidence over the mine workings on flooding zones distribution, the values of maximum possible vertical surface displacements over the mine workings contours were calculated, based on geological and surveying data. The relief mathematical model was developed with given expected vertical deformations using the GIS-techniques and the original DEM of the territory.The result of the radar satellites images processing is a cartographic model that demonstrates the intensity of uplift movements of the earth surface. Areas of distribution of large-amplitude movements (10-20 mm/year) were determines. As a result, an updated scheme of the forecasted flooded zones was developed.

Relaxation of the south flank after the 7.2-magnitude Kalapana earthquake, Kilauea Volcano, Hawaii

1994 ◽  
Vol 84 (1) ◽  
pp. 133-141
Author(s):  
John J. Dvorak ◽  
Fred W. Klein ◽  
Donald A. Swanson
Keyword(s):  
Rift Zone ◽  
Vertical Surface ◽  
Kilauea Volcano ◽  
Adjacent Segment ◽  
The South ◽  
Surface Displacements ◽  
Kīlauea Volcano ◽  
Parkfield Earthquake ◽  
Largest Aftershock ◽  
Large Earthquakes

Abstract An M = 7.2 earthquake on 29 November 1975 caused the south flank of Kilauea Volcano, Hawaii, to move seaward several meters: a catastrophic release of compression of the south flank caused by earlier injections of magma into the adjacent segment of a rift zone. The focal mechanisms of the mainshock, the largest foreshock, and the largest aftershock suggest seaward movement of the upper block. The rate of aftershocks decreased in a familiar hyperbolic decay, reaching the pre-1975 rate of seismicity by the mid-1980s. Repeated rift-zone intrusions and eruptions after 1975, which occurred within 25 km of the summit area, compressed the adjacent portion of the south flank, apparently masking continued seaward displacement of the south flank. This is evident along a trilateration line that continued to extend, suggesting seaward displacement, immediately after the M = 7.2 earthquake, but then was compressed during a series of intrusions and eruptions that began in September 1977. Farther to the east, trilateration measurements show that the portion of the south flank above the aftershock zone, but beyond the area of compression caused by the rift-zone intrusions and eruptions, continued to move seaward at a decreasing rate until the mid-1980s, mimicking the decay in aftershock rate. Along the same portion of the south flank, the pattern of vertical surface displacements can be explained by continued seaward movement of the south flank and development of two eruptive fissures along the east rift zone, each of which extended from a depth of ∼3 km to the surface. The aftershock rate and continued seaward movement of the south flank are reminiscent of crustal response to other large earthquakes, such as the 1966 M = 6 Parkfield earthquake and the 1983 M = 6.5 Coalinga earthquake.

The effect of multiple splay fault rupture on tsunamis

2020 ◽  
Author(s):  
Iris van Zelst ◽  
Leonhard Rannabauer ◽  
Alice-Agnes Gabriel ◽  
Ylona van Dinther
Keyword(s):  
Vertical Surface ◽  
Tsunami Hazard ◽  
Fault Rupture ◽  
Geophysical Research ◽  
Large Wave ◽  
Surface Displacements ◽  
Seismic Cycles ◽  
Splay Faults ◽  
Splay Fault ◽  
The Waves

<p>Earthquake rupture on splay faults in subduction zones could pose a significant tsunami hazard, as they could accommodate more vertical displacement and are situated closer to the coast. To better understand this tsunami hazard, we model splay fault rupture dynamics and tsunami propagation and inundation constrained by a geodynamic seismic cycle (SC) model; building on work presented in Van Zelst et al. (2019). This two-dimensional modelling framework considers geodynamics, seismic cycles, dynamic ruptures, and tsunamis together for the first time. The SC model provides six blind splay fault geometries, self-consistent stress and strength conditions, and heterogeneous material properties in the domain. We find that all six splay faults are activated when the megathrust ruptures. The largest splay fault closest to the nucleation region ruptures immediately when the main rupture front passes the branching point. The other splay faults are activated through dynamic stress transfer from the main megathrust rupture or reflected waves from the surface. Splay fault rupture results in distinct peaks in the vertical surface displacements with a smaller wavelength and larger amplitudes. The effect of the vertical surface displacements also translates into the resulting tsunami, which consists of one large wave for the megathrust-only model and seven waves for the model including splay faults. Here, six of the waves can be attributed to the splay faults and the seventh wave results from the shallow tip of the megathrust. The waves from the rupture including splay faults have larger amplitudes and result in two episodes of coastal flooding. The first episode is due to the large wave caused by rupture on the largest splay fault nearest to the coast. The second flooding episode results from the combination and interference of the waves caused by the rest of the splay faults and the shallow megathrust tip. In contrast, the tsunami caused by rupture on only the megathrust has only one episode of flooding. Our results suggest that larger-than-expected tsunamis could be attributed to rupture on large splay faults. When multiple smaller splay faults rupture their effect on the tsunami might be hard to distinguish from a pure megathrust rupture. Considering the significant effects splay fault rupture can have on a tsunami, it is important to understand splay fault activation and to consider them in hazard assessment.</p><p>References:</p><p>Van Zelst, I., Wollherr, S., Madden, E. H. , Gabriel, A.-A., and Van Dinther, Y. (2019). Modeling megathrust earthquakes across scales: one-way coupling from geodynamics and seismic cycles to dynamic rupture. Journal of Geophysical Research: Solid Earth, 124, https://doi.org/10.1029/2019JB017539</p><p></p>

INFLUENCE OF PARAMETERS OF THE ROUGHLY DISPERSED DUST GAS MIXTURES AT THE TIME OF THEIR BURN-OUT IN MINE WORKINGS OF COAL MINES

Ugol ◽  
2018 ◽  
pp. 44-49 ◽  
Author(s):  
S.V. Cherdantsev ◽  
◽  
Kh.U. Lee ◽  
Yu.M. Filatov ◽  
P.A. Shlapakov ◽  
...  
Keyword(s):  
Coal Mines ◽  
Gas Mixtures ◽  
Burn Out ◽  
Mine Workings

Ukraine coal shortages risk winter crisis

2015 ◽  
Keyword(s):  
Coal Mines ◽  
Heating Power ◽  
Coal Extraction ◽  
Energy Problem ◽  
Content Type ◽  
Power Stations ◽  
The Government

Subject Kyiv's next energy problem. Significance Although Ukraine and Russia have agreed a new so-called 'winter package' gas deal until March 2016, Kyiv faces another energy problem. With so many of Ukraine's coal mines lying in war-ravaged Donbas, the nation's coal extraction has fallen significantly and the government is facing shortages. Impacts If Ukraine's heating power stations enter winter with inadequate reserves of coal, this will create a season of power cuts. Unprecedented energy economising may accelerate, which could lead to increased public discontent. The coal industry's inefficiency will keep the issue of privatisation on the government's agenda, but economic woes will hinder this.

scholarly journals Dependence of gas emission from the sources undermined by stope mine workings on the rocks displacement parameters

2018 ◽  
Vol 60 ◽  
pp. 00019
Author(s):  
Mykhailo Filatiev ◽  
Elvira Filatieva ◽  
Mykola Antoshchenko
Keyword(s):  
Main Roof ◽  
Earth Surface ◽  
Gas Emission ◽  
Gas Drainage ◽  
The Earth ◽  
Coal Deposits ◽  
Maximum Subsidence ◽  
Mine Workings ◽  
First Time ◽  
Positive Results

The parameters are established in the work of the stope mine workings and rocks displacement, which correspond to the maxima of gas emission into the gas drainage boreholes. The angular and linear parameters of the crustal movement and rocks displacement have been calculated with the use of empirical dependences. These parameters correspond to the maxima of gas emission into the gas drainage boreholes. The obtained positive results for determining the possible areas of maximum gas emission allow us to recommend the empirical dependences for calculating the angles of maximum subsidence and complete displacements at the stage of stope works development, as well as the dimensions of the stope mine workings, at which the processes of rocks displacement reach the earth surface. The established relations between the gas drainage boreholes location and the rocks displacement zones with discontinuity make it possible to design the optimal schemes of draining-out of gases from the gas-and-coal deposits. For the first time, three independent methods have been used to determine the changes in dimensions of rocks displacement zones with discontinuity after the primary main roof squeezing until the formation of stable upper boundaries of these zones.

Sign in / Sign up

Export Citation Format

Share Document