Fracking and Quaking

According to this study it seems as if fracking induced seismic activity is very rare, but does happen sometimes.In the study 77 earthquakes (we would call them tremors as they were hardly felt by people if felt at all), which were closely related spatially and temporally to active hydraulic fracturing operations, were identified in Poland Township, Mahoning County, Ohio. I'm no seismologist, but just by reading the abstract, it seems as if the seismic activity was directly induced by the fracking itself. The study also mentions another earthquake sequence that occurred 18 km to the northwest which was correlated with wastewater injection instead of hydraulic fracturing.And the source is credible; not just some wacko greenies writing nonsense on the net. Edited by Pressie, : Added part in brackets and last sentence

We find the same in the traditional coal mining areas in my country. That gas is a result of what happened in mining relatively shallow coal in underground operations. As hydraulic fracturing has never been done on commercial scale in my country, it means that fracking is not to blame for it.It also happens in areas where deep gold was mined (>2000 m). Deep gold mining has resulted in a lot of tremors. There the coal is found a few hundred meters above, but the coal was never mined.Any mining activity would result in more seismic activity.At the same time most people also have to realise that explosions by dynamite in any underground mining operation register as seismic activity on the instruments used by seismologists.Edited by Pressie, : No reason given.Edited by Pressie, : No reason given.