The 5.6-magnitude earthquake that struck Oklahoma Saturday was not only one of the strongest in state history, it was one of the first that insurance companies linked directly with hydrofracking and wastewater injection — an association that could lead to complications for quake coverage for homeowners and liability policies for oil and gas companies.The quake hit just after 7AM near Pawnee, Oklahoma and was followed by massive aftershocks throughout the day measuring as much as magnitude 3.6. Though there was just one injury over the weekend, the tremor tied with a 2011 quake near Prague as the strongest in Oklahoma history.