More than 230 earthquakes of magnitude 3 or above have occurred in a state since 2014, compared with an average of one a year before 2008. Frequent seismic activity has raised questions and some researchers have found that since 2014, in order to prevent toxic waste water from drilling and hydraulic fracturing in oil production from polluting surface water, start injecting this waste water into the impervious layers of underground rocks, which is likely to be the key cause of the earthquake.
 The injection of waste water into the rock water layer will reduce the friction between faults, making it easier to slide, thus inducing earthquakes can best support the above conjecture.