Map of the Day: What do San Francisco and Oklahoma City Have in Common?

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Here is today’s mystery map. Can you guess what it is?

This map comes from a team of researchers writing in Seismological Research Letters, and it shows the 2017 earthquake risk in various parts of the country. You probably aren’t surprised to see either California or Seattle in dark orange. If you’re familiar with the New Madrid fault, you’re not surprised by the blotch on the border of Arkansas and Tennessee. But Oklahoma City?

Yep. It’s all because of fracking:

Most of the induced earthquake activity in the central and eastern United States (CEUS) is caused by deep wastewater disposal. Injected wastewater causes pressure changes that can weaken (unclamp) a fault and therefore bring it closer to failure. Seismicity rates in Oklahoma increased exponentially beginning in 2009.

….In Oklahoma, during 2016, a 13 February [magnitude] 5.1 earthquake near Fairview, a 3 September magnitude 5.8 earthquake near Pawnee, and a 7 November magnitude 5.0 earthquake near Cushing caused damaging ground shaking. These damaging events are thought to be the result of  wastewater injection, and the potential for future large earthquakes causes concern to officials responsible for public safety and welfare.

That magnitude 5.8 earthquake in Pawnee is the largest ever recorded in Oklahoma. However, thanks partly to reduced demand for oil and partly to new regulations, the earthquake risk in Oklahoma has decreased a bit in the past year. For now, though, it’s still pretty high. I knew all about the seismic danger from fracking before I read this, but I didn’t realize that, for now anyway, Oklahoma City is literally as earthquake prone as San Francisco.

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DEMOCRACY DOES NOT EXIST...

without free and fair elections, a vigorous free press, and engaged citizens to reclaim power from those who abuse it.

In this election year unlike any other—against a backdrop of a pandemic, an economic crisis, racial reckoning, and so much daily bluster—Mother Jones' journalism is driven by one simple question: Will America move closer to, or further from, justice and equity in the years to come?

If you're able to, please join us in this mission with a donation today. Our reporting right now is focused on voting rights and election security, corruption, disinformation, racial and gender equity, and the climate crisis. We can’t do it without the support of readers like you, and we need to give it everything we've got between now and November. Thank you.

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