Two reasons. First, the frequency and intensity of Oklahoma earthquakes have grown dramatically in the last few years. In both the northwest and the central part of the state these increases are directly tied to the injection wells required for fracking. Increasingly damage to both private and public property is a concern.
Second, the frequency and intensity of Oklahoma earthquakes is occurring closer and closer to the Cushing hub. This pipeline node and tank farm on any one day stores more than 50 million barrels of oil. Any damage to the Cushing hub infrastructure could severely impact the petro-chemical plants and refineries that are concentrated along the Gulf of Mexico from Texas to Alabama. As such, Oklahoma earthquakes are potentially man-made disasters that could have a negative impact on our national security because they potentially threaten our oil-based economy.
In my opinion the Oklahoma Corporation Commission is taking a first step, unprecedented in this state, to attempt to limit earthquakes caused by a by-product of the fracking process. It still remains to be seen, however, whether their efforts will succeed.
For a more detailed discussion of this subject, see http://www.homelandsecuritynewswire.com/dr20160524-update-on-earthquakes-newest-results-from-oklahoma-commission-look-encouraging