Which earthquakes are you referring to specifically? From what I can find, it isn’t the fact that the oil is gone that triggers the quakes so much as it is the process of the removal itself. It is believed that fracking causes earthquakes near drilling sites, which is one reason why there is a movement to ban the recovery process in the UK. Also, geothermal drilling causes quakes because the drillers are basically creating little quakes by fracturing rock. This is basically what an earthquake is: the release of built up energy by fracturing, faulting, or folding. If, in the process of drilling a large existing fracture is intersected, a bigger earthquake could be triggered if their is already a significant amount of pressure present.
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