The range of 60-70 decibels sound pressure level is about as loud as normal conversation in 1 meter distance. The distance from the ears to the sound source is very important to the value of the SPL. Scroll down to related links and look at Table of Sound Pressure Levels.
1 Primarily, during the fracking process:  [Earthquakes] were caused by fluid injection during hydraulic fracturing in proximity to pre-existing faults.. 2  Secondarily, via the disposal of fracking wastewater via underground injection.
Don't let Big Oil and Gas frack our public lands. Fracking pollutes our air and drinking water, hurts communities, worsens climate change, and is linked to earthquakes. It is unacceptable that the oil and gas industry profits off fracking at our expense. Itâs time to say no to fracking, and yes to clean, renewable energy.