Geologists say pre-existing wastewater in the Arbuckle may have triggered the Saturday earthquake.
Officials with the Oklahoma Geological Survey said that this earthquake struck during a time when injection well activity had been reduced and seismic activity was down. But, the 5.6 magnitude earthquake didn’t come as a huge shock to geologists on Saturday.
The OGS says shaking can occur months or even years after the wastewater was injected, and the state can expect some aftershocks over the next few weeks. Any further seismic activity related to this past Saturday isn’t expected to reach the level of Saturday’s event, put it still considered possible.
The OGS has a website where you can report seismic activity. If you feel it, go to https://earthquake.usgs.gov/data/dyfi/. This helps the Survey track activity in the state.