By Edward McAllister NEW YORK (Reuters) - Colorado regulators said on Thursday that the disposal of oil and gas wastewater at a well in Weld County likely caused a series of small earthquakes this year, in another sign that a U.S. drilling boom is contributing to higher seismic activity. The issue of wastewater disposal disturbing underground faultlines has become a national issue in the United States where drilling and wastewater disposal have increased sharply in recent years. The Colorado Oil and Gas Conservation Commission (COGCC) halted activity at a wastewater disposal site owned by NGL Water Solutions DJ LLC on June 23, after a 3.2 magnitude quake on May 31 was followed by other smaller tremblers in the area. COGCC is investigating whether the company exceeded permitted injection volumes.
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