I would like to put forward an idea that came to me after reading Hiroshi Yamamoto's ICCF-12 paper entitled "An Explanation of Earthquakes by the BlackLight Process and Hydrogen Fusion." Yamamoto suggests that injecting water into wells in Japan and the US might have been triggering earthquakes through the production of hydrinos and the subsequent formation of helium (through a process that is not very clear, but might involve a diproton).
More recently in the US state of Oklahoma, which has seen a fracking boom, the number of earthquakes has been very high. There is a clear relationship between these earthquakes and the injection of fracking wastewater back into the ground, hence they are thought to be manmade. Another interesting detail is that the ratio of 3He/4He in the earth's atmosphere is 100 times lower than in the visible universe, meaning that we have much more 4He here on earth. I would like to take Yamomoto's suggestion and modify it, by proposing that when the water is injected into the ground, it induces alpha decay in alpha emitters in the soil to a significant extent. These form helium gas along cracks in the rock, and the gas leads to an expansion that creates stress and triggers the earthquakes. Eric
