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The link between oil drilling and the California earthquakes was discovered in San Ardu. | News

 


California has a lot of oil exploration and many earthquakes. These two things were thought to be unrelated.

When scientists discovered that oil operations caused earthquakes in Texas, Oklahoma and elsewhere, they could not find any such link in California.

Now, two seismologists who have studied seismic activity near oil fields in San Ardu in southern Monterey County say that pumping wastewater into the ground is likely to cause small earthquakes for decades.

Their work was funded by the US Department of Energy and published November 11 in the academic journal Seismological Research Letters. The authors are Thomas HW Goebel of Memphis University and Manoochehr Shirzaei of Virginia Tech.

They chose San Ardu because the oil fields are located only 22 miles from the San Andreas fault, and local oil operators pump waste fluids into the ground near seismically active faults.

After analyzing data from 40 years of drilling in San Ardo, they found a high degree of correlation between fluid injection and earthquakes. According to the pattern that emerged, 1735 seismic events occurred in the study area in clusters near injection wells. In other words, while California is prone to earthquakes, it is very unlikely that the tremors that have been recorded would have occurred where they did not have the additional pressure on tectonic faults.

Earthquakes from industrial fluid injection tend to be small and harmless, but they are sometimes powerful enough to destroy buildings and wells.

Without shutting down the oil fields, there are ways to reduce the likelihood of man-made earthquakes. Researchers Goebel and Shirzaei offer three measures: reducing the amount of wasted fluid, injecting further away from some geological formations, and avoiding deep tectonic faults.

To read more about this discovery, see this article written by a researcher in regular English.

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