The Associated Press reports that "earthquakes used to be almost unheard of on the vast stretches of prairie that unfold across Texas, Kansas and Oklahoma."
"But in recent years, temblors have become commonplace. Oklahoma recorded nearly 150 of them between January and the start of May. Most were too weak to cause serious damage or endanger lives. Yet they’ve rattled nerves and raised suspicions that the shaking might be connected to the oil and gas drilling method known as hydraulic fracturing, especially the wells in which the industry disposes of its wastewater."
"Now after years of being harangued by anxious residents, governments in all three states are finally confronting the issue, reviewing scientific data, holding public discussions and considering new regulations."