Natural Gas Drilling and Eathquakes

Many beleive that the increase in seismic activity in Arkansas is in direct correlation with natural gas drilling. According to Steve Horton, an earthquake specialist at the University of Memphis earthquake research, 90% of the earthquakes that have happened since 2009 have occurred within 6km of natural gas drilling. However many scientist are not convinced, such as Chi-Yuen Wnag, Professor at Berkley, whose research includes the interaction of water and earthquakes. There could be a correlation between the increased eathquake activity in Arkansas and drilling, but it appears that more research is needed in past and future eathquake activity in areas where drilling has occurred and is now halted.