· Given that we know the length of the rock core ( L ), the seismic velocity is given by: V = L Δ t In practice, the user may control whether they are measuring P-wave or S-wave velocities by specifying the direction of elastic deformation within the source transducer.

 · The seismic velocity anisotropy is larger within in the shaly facies (AvP = 23 per cent, AvS = 32 per cent) compared to the sandy facies (AvP = 9 per cent, AvS = 12 per …

Metadata. Time-lapse passive seismic velocity tomography was conducted utilizing data from three underground longwall coal mines to produce a better understanding of the processes that lead to ground failure in mines, especially large, violent failures, such as bumps. Two of the datasets, US Western I and US Western II, were collected at bump ...

 · Rockburst is a typical dynamic disaster in underground coal mines which its occurrences relate to the mechanical quality of coal seam and surrounding rock mass and also the condition of stress distribution. The main aim of this paper is to study the potential of rockburst in a longwall coal mine by using of passive seismic velocity tomography and …

@article{osti_6034871, title = {Latest trends in seismic coal field exploration}, author = {Arnetzl, H H}, abstractNote = {The basic principles of seismic surveying are briefly outlined. In West Germany two steps are usual in the seismic exploration procedure: a reconnaissance exploration applying two-dimensional seismic reflection line surveys, and …

· Seismic velocity tomography can be implemented to infer stress distribution at mines and determine when a dangerous situation is developing. Three different methods …

 · The maximum value of P-wave velocity is up to 5700 m/s, while the maximum positive anomalies of velocity and velocity gradient are 0.23 and 0.21, respectively, which …

 · The maximum value of P-wave velocity is up to 5700 m/s, while the maximum positive anomalies of velocity and velocity gradient are 0.23 and 0.21, respectively, which indicates that the areas mentioned above were at a middle seismic hazard risk at present stage and in the further mining period, due to the rupture or movement of overburden …

 · Abstract. Mining operation, especially underground coal mining, always has the remarkable risks of ground control. Passive seismic velocity tomography based on …

 · Bio-diversity. The first and direct impact of mining operations in forested areas is the eviction of forests which alters the food availabilities and wildlife habitat. Kumar and Pandey (2013) 62 noticed that in some of the coal mines, the forest cover is completely lost to the mining enterprises.

 · THE COAL MINES REGULATIONS, 1957 S.R.O.3419 dated the 24th October, 1957 – In exercise of the powers conferred by section 57 of the Mines Act, 1952 (35 of 1952) and in supersession of the Indian Coal Mines ... They extend to the whole of India. (3) They shall apply to every coal mine. 2. Definitions – In these regulations, unless there is ...

 · Coal burst refers to the sudden, rapid, and violent release of elastic deformation energy accumulated in coal or coal measure rocks triggered by coal mining, thus causing strong vibration, casualties, equipment destruction, roadway failure, and dust explosion [1, 2].In China, as recent years have witnessed a rising mining depth and mining intensity, …

 · Microseismic effects during the transmission of seismic waves in coal and rock mass associated with mining operation were studied by on-site blasting tests and microseismic monitoring in LW704 of Southern Colliery, Australia, by using spread velocities, amplitudes and frequency contents as the main analysis parameters.

 · Seafloor bathymetry and island topography in the eastern Indian Ocean. The Sunda Trench is marked by a white line. The yellow dashed lines mark the fracture zones, which have a N9°E azimuth (F2–F8) and have been reactivated as left-lateral strike-slip faults [Deplus et al., 1998; Carton et al., 2014].The earthquake sequence in 2012 is …

 · Coal demand in the country is yet to peak as the Economic Survey 2021-22 projects coal demand in the range of 1.3-1.5 billion tonnes by 2030, an increase of 63 percent from the current demand. Thus, as of now, there is no scenario of energy transition away from coal affecting any stakeholders involved in coal mining.

 · The active and passive seismic velocity tomograms were simultaneously applied on the longwall mining panels at the Yima Yuejin coal mine, Henan Province, China, and …

Time-lapse passive seismic velocity tomography was conducted utilizing data from three underground longwall coal mines to produce a better understanding of the processes that lead to ground failure in mines, especially large, violent failures, such as bumps.

 · The Ministry of Coal has the overall responsibility of determining policies and strategies in respect of exploration and development of coal and lignite reserves, sanctioning of important projects of high value and for deciding all related issues. Under the administrative control of the Ministry, these key functions are exercised through the ...

 · Time-lapse passive seismic velocity tomography was conducted utilizing data from three underground longwall coal mines to produce a better understanding of the …

 · In the Fig. 5 b, we show the estimated average seismic velocity changes from the coda waves and the total seismic energy for events stronger than 10 4 J ( M = 1.2) per day. For interpretation, we divide the …

 · Seismic Velocities of Rocks and Various Materials. Material. P-wave (m/s) S-wave (m/s) Air. 343. N/A. Water. 1450 - 1500.

2  · The IMS seismic system is designed primarily for use in the mining environment. The seismic system is tailored to meet the specific monitoring requirements and objectives of any mining operation. Applications deep-level hard rock gold and platinum mines coal mines base-metal mines kimberlite (diamond) mines Mining Environments

 · and shear modulii increase faster than the density. In seismic exploration there are many empirical relationships between velocity and depth of burial and geologic age. The relationship between intrinsic rock properties such as porosity, fracture content, fluid content and density and velocity underlie the empirical relationships mentioned above.

 · Seismic velocity tomography has been widely used to infer high stress distributions in underground coal mines. For instance, Hosseini et al. ( 2012, 2013 ) used passive seismic velocity tomography to evince the stress state around a longwall mining panel, found that high-velocity regions matched regions under high-abutment stress, and …

 · Underground coal mining (down to {approx}0.75 km depth) in the contiguous Wasatch Plateau (WP) and Book Cliffs (BC) mining districts of east-central Utah induces abundant seismicity that is monitored by the University of Utah regional seismic network.

 · Table 5.3a. Rock densities and porosities. being in g/cm and or 0.23 when is in m/s or ft/s, respectively. The rule is valid for the major sedimentary rock types, but not for evaporites or carbonaceous rocks (coal, lignite). When a porous rock is saturated with a fluid, its density is given by the equation.

Total Seismic provides an extensive range of geophysical and project delivery services to the Coal industry. We have expertise in surface and airborne geophysical surveys and all stages of seismic, passive seismic and non-seismic data workflows. We work hard to help you achieve the best value geophysical data in a controlled and productive ...

 · Figure 1. Synthetic seismic reflection from cyclic coal seams. Acoustic properties of coal from lab measurement Qiuliang Yao *, De-hua Han, University of Houston Summary Ultrasonic velocities, densities and porosities for a set of coal and surrounding silty coal, silty shale, and shaly coal samples were measured in laboratory. The pressure effect,

 · seismic velocity tomography, classified as "active" and "passive" based on the type of source used (luxbacher, 2008), has been applied in various fields including …

 · Coal. 2200 - 2700. 1000 - 1400. Salt. 4500 - 5500. 2500 - 3100. Anhydrites. 4000 - 5500. 2200 - 3100. Limestones. 3500 - 6000. 2000 - 3300. Dolomites. 3500 - …

 · Seismic velocity tomography can be implemented to infer stress distribution at mines and determine when a dangerous situation is developing. Three different methods …

The Coal Mine Information System (CMIS) is a repository for historical coal mining information in Indiana. It was developed through a cooperative agreement between the Indiana Geological Survey and the Indiana Department of Natural Resources, Division of Reclamation. In addition to historical documents, prepared maps and reports, the CMIS …