I think you are confused about what causes earthquakes from fracking. They're not caused by the initial fracturing of the crust, they are caused by wastewater disposal wells, which is exactly the kind of solution you are proposing.

https://www.usgs.gov/faqs/does-fracking-cause-earthquakes

>In Oklahoma, which has the most induced earthquakes in the United States, 2% of earthquakes can be linked to hydraulic fracturing operations. Given the high rate of seismicity in Oklahoma, this means that there are still many earthquakes induced by hydraulic fracturing. The remaining earthquakes are induced by wastewater disposal.

So only 2% of the earthquakes are from the actual fracking, 98% are from wastewater disposal. If waste disposal can trigger that many earthquakes in a relatively inactive zone like Oklahoma, imagine the problems it would cause in a state like California where the majority of the population lives within 30 miles of a fault zone.