A Song for Oklahoma
USGS Earthquake simulation testing team is onsite below verifying my theory…
The gas does not ignite at first because the concentration of gas in air >15% by volume
Once the gas is diluted down to between 5-15% by volume in air the spark will ignite/detonate the mixture.
Air concentration at the bottom of gravity disposal wells will be too high so the underground detonations will occur away from the bottom of the disposal well when the air has had a chance to mix with enough natural gas for ignition/detonation to occur (5-15% Natural gas in air by volume).