On february 17th 2014, the Oklahoma Geological Survey (OGS), which conducts research and education on the states geology and mineral resources, have released a position statement on the subject of earthquakes swarms in the state of Oklahoma as a result of Unconventional Gas Extraction and Exploration (UGEE) practices.
In the position statement, the OGS confirms recent data found on the subject and outlines future monitoring programs that look to understand better anthropogenic seismicity in the state over the future.
In regards to current data, the statement confirms:
– Since earthquake monitoring began in Oklahoma 40 years ago, there were on average
50 earthquakes per year.
– Since the arrival of unconventional shale gas extraction in 2009-2014, earthquake activity
for the five year period is 40x stronger than previous 30 years combined.
– Seismicity of recent ‘felt’ earthquakes is greater now than over the last 100 years.
– Seismic activity, both historical and recent occur cross major geological paleo-structures.
In relation to the link between UGEE and earthquakes:
– Acknowledgement that scientists confirm that earthquakes are related to subfurface withdrawl and the waste management practice of fluid injection wells.
– Despite the fact that shallow saltwater injection wells are used in Oklahoma, the earthquakes experienced are located far deeper underground.
– There may be a correlation in time and space between earthquakes and fracking wastewater injection wells located within 8km from one another.
To read the position statement in full, including information on future plans for study and research, click here.
To read recent, scientific peer reviewed studies relating earthquake swarms to fracking waste water fluid injection wells, click here.