TULSA, Okla. – Oklahoma 4.0 earthquakes are up significantly this year, but the total rate of earthquakes decreases.
Oklahoma has six quakes of at least magnitude 4.0 halfway through this year, that is one more than last year. But the general rate of earthquakes has dropped, with 96 earthquakes of magnitude 3.0 or higher, to June 30, compared with 144 at this point last year and 302 at the end of 2017, the Tulsa World reported. A magnitude 4.6 in April in the vicinity of Perry was one of the 12 largest in state history.
Scientists are largely of earthquakes on non-mapped faults that were activated in 2014 due to waste water injection, said state seismologist Jake Walter. Scientists are investigating the specific mechanisms by which the state of the current seismic activity is triggered, he said. Wastewater can lead to the first earthquake, but quakes itself can lead to more earthquakes.
“So in some ways the waste water injection has led to a new paradigm that defies how we would categorize the main shock and aftershocks, if this is a bug had crept in a more natural environment,” he said.
Walter said that Oklahoma’s seismic risk seems to be on the latest risk forecast brought to you by the U. S. Geological Survey in March. The agency calculated Oklahoma’s short-term risk levels to compare with the active regions in California. The chance of earthquake damage in high-risk areas of Oklahoma this year ranges from 1 percent to 14 percent, “much higher” than most parts of the US.
Information: Tulsa World, http://www.tulsaworld.com