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2016. 3. 25. Anomalous Seismic Velocity Drop in Iron and Biotite Rich Amphibolite to Granulite Facies Transitional Rocks from Deccan Volcanic Covered 1993 Killari 2016. 7. 1. They are associated with a mean P-wave velocity of 6.02 km/s (range 5.82-6.22 km/s) conforming to granitic upper crust, but in contrast have a high mean density of 2.91 g/cm 3 (range 2.75-3.08 g/cm 3 ), which characterise mid to lower crust. Within the H2020-funded Smart Exploration project existing legacy seismic data acquired in the Ludvika Mines are analysed in order to delineate the deposits in depth. Here we present a velocity model derived using first-break traveltime tomography, which represent the near-surface materials at high resolution and can be directly used for refraction static calculations or incorporation and for depth imaging algorithm. Computations using ITRF2000, NUVEL-1A and GSR models demonstrate that the average velocity for the central India has a value of ~54 mm/yr towards N050 . 2000. 7. 1. Analysis of the refracted arrivals on a seismic reflection profile recorded along the wall of a tunnel at an iron mine near Thabazimbi, South Africa, shows variations in P-wave velocity in dolomite away from the de-stressed zone that vary between 4.4 and 7.2 km/s, though values greater than 5.8 km/s predominate along most of the profile. 2015. 8. 10. seismic survey with relatively sparse source-receiver geometry was used to detect the presence of a possible intrusive package within 2km depth range. The modelling results demonstrates that seismic reflection method using 10m geophones and 20m shot spacing can be used to image deposit within the depth of 2km. The 2007. 8. 30. velocity as per the current DGMS standard is 5 mm/s. In complying with such a low statutory limit, coal mines located close to surface structures are struggling for their survival. Other conditions being similar, non-coal mines are in a better position because frequencies are relatively high for which permissible levels are also high. 2015. 6. 3. Section 1 Mining industry in India • Large listed state owned mining companies, integrated private mining-metal companies, and independent holdings. SOMC dominate: 72% by value produced but differ by sector (92% in coal, 31% in iron ore). • A large part of the industry is fragmented (573 coal, 553 metallic, 1523 non-metallic mines) 2014. 7. 16. · 1990: Attenuation and velocity measurements on sands with theoretical considerations of contact radius effects on it: Application of the absorption of seismic waves in hydrocarbon exploration, Industry consortium on “Attenuation of Seismic Waves”: DGMK-Project 386, DGMK, Hamburg. 2019. 8. 15. Unexpectedly low seismic velocities of CaSiO3 perovskite in deeply subducted oceanic crust can explain the properties of anomalous continent-sized regions in Earth’s lower mantle.
Anomalous Seismic Velocity Drop in Iron and Biotite Rich
Anomalous Seismic Velocity Drop in Iron and Biotite Rich
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Seismic velocities of CaSiO 3 perovskite can explain LLSVPs