Why are the seismic and subsidence issues being ignored by NGOs and media? That is for them to answer. Whatever the reason the ongoing silence it is putting us all at immediate danger of an unlivable radioactively contaminated environment.
This is the latest in the extensive evidence on earthquakes caused by deep coal mining …
- Original Article
- Published:
On the strong earthquakes induced by deep coal mining under thick strata-a case study
Geomechanics and Geophysics for Geo-Energy and Geo-Resources volume 7, Article number: 97 (2021) Cite this article
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Abstract
Different from the shallow coal seam, in deep mining, the dynamic response of overlying rock has changed significantly due to the high in-situ stresses and complex geological conditions. The frequent occurrence of strong mine earthquakes seriously restricts the safe and efficient mining of deep coal resources. This paper investigates the distribution and evolution of strong mining earthquakes during the process of deep coal seam mining in Dongtan coal mine of China by means of the microseismic monitoring and surface subsidence monitoring technologies. Results show that strong mine earthquakes occurring in the 1st square of the single goaf in each working face take the largest proportion. Most of the mine earthquakes are basically concentrated in the lower hard rock layer in the early mining stage. As the working face advances, mine earthquakes primarily rise straightly to the far-field hard layers. In the early stage of coal mining, the frequency of earthquakes is significantly high. After the mine earthquake goes into the higher hard strata, the frequency of strong mine earthquakes in lower layers decreases. The strong mine earthquake occurs with higher probability when the surface subsidence rate changes rapidly. When multiple layers of hard rock exist, the overburden fracture behaviors become complicated. A large energy mine earthquake in far-field overlying hard strata during deep coal mining is generally caused by the coordinated fracture of multi-strata, which can be reflected by the waveform of mine earthquakes.
Article highlights
- The distribution and evolution of strong mine earthquakes during the process of deep coal seam mining are investigated.
- As the working face advances, mine earthquakes primarily rise straightly from low field hard strata to the far field.
- The strong mine earthquake wave characteristics and surface subsidence behaviors when the earthquake occurs are also investigated.
Keep Cumbrian Coal in the Hole 
Reblogged this on RADIATION FREE LAKELAND.
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WE should welcome the fact that at long last the full implications of climate change are being recognised – it has taken a long time and the deniers are much the same interests that want to see more nuclear.
The main thing now is to make sure that ‘they’ don’t use climate as an excuse for yet more nuclear by making out that it is ‘green’.
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It has been obvious for a long while (since Tony Blair’s Govnt Dept of Energy and Climate Change) that nuclear is being promoted off the back of climate – climate activists who have been “demanding” action without equally vehement calls to scrap nuclear have opened the door to this ..https://www.iaea.org/newscenter/news/key-role-for-nuclear-power-in-climate-change-urged-by-youth-activists-at-cop26-event
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https://www.voanews.com/a/russian-coal-mine-accident-leaves-workers-dead-injured/6327372.html
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The awful fire and tragic loss of life in Russia is in a methane rich coking coal mine which is highly mechanised and producing around the same amount of coal each year (5 million tonnes) as that planned by the new Cumbria coal mine (over 3 million tonnes)
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