And the Earth moves.
On Monday, the U.S. Geological Survey published for the first time an earthquake hazard map covering both natural and "induced" quakes. The map and an accompanying report indicate that parts of the central United States now face a ground-shaking hazard equal to the famously unstable terrain of California.
Some 7 million people live in places vulnerable to these induced tremors, the USGS concluded. The list of places at highest risk of man-made earthquakes includes Oklahoma, Kansas, Texas, Arkansas, Colorado, New Mexico, Ohio and Alabama. There are also states with wastewater-disposal wells but no record of recent natural earthquakes -- suggesting that the practice of injecting wastewater deep into the Earth can be done more safely in some places than in others.
The report, based on recent seismic activity, is just a one-year hazard assessment. In effect, the scientists have said that what has happened in the recent past with induced earthquakes will likely happen in the near future -- hardly a radical finding. The goal is to help communicate the risks to the general public. Past USGS hazard maps didn't include man-made events.
With a few exceptions, locations in the nation's central and eastern regions are not generally thought of as seismically unstable. But, Blanpied said, “Pretty much everywhere has faults. The nation was built over a billion years, and lots and lots of faults are left over from the construction process.”
Полная версия: https://www.washingtonpost.com/news/speaking-of-science/wp/2016/03/28/new-seismic-hazard-map-includes-fracking-related-quakes-for-the-first-time/?wpisrc=al_alert-hse