OKLAHOMA CITY - While Oklahoma has seen a steady decrease in earthquakes over the past couple of years, they're still happening and geologists want to know why. 

The U.S. Geological Survey said the epicenter of Sunday's 3.7 quake near Danforth and Air Depot was followed by a smaller one in the same area as other clusters in Edmond this year including a 4.2 quake back in August.

Overnight Saturday, there were also four earthquakes in the Taloga/Seiling area. 

In Monday's meeting, Oklahoma Geological Survey and Oklahoma Corporation Commission will discuss operations near both of these clusters and see if they can come up with a cause/solution.

The cause for the quakes is unknown because there are currently no wastewater injection wells in the area.

OGS told News 9 the shaking could be a pressure increase from injections farther away or a delayed effect of past wastewater activity.