Here’s a quick review of developments related to the fast-expanding
extraction of natural gas using hydraulic fracturing, otherwise known as
fracking, that point to a route forward amid concerns about everything from earthquakes to water pollution.
As soon as I heard about the 5.6-magnitude earthquake
amid a cluster of recent lesser tremors in Oklahoma, I figured the
potential relationship of some earthquakes to drilling would emerge.
There are hints that some fracking operations in Oklahoma and elsewhere have induced minor earthquakes, although there’s no apparent connection between human activities and the bigger Oklahoma quakes in recent days.
The
clearest connection between drilling and significant seismic activity
is not related to the fracturing of rock to liberate gas. It’s from
instances where waste fluids — for example, the water used in fracking —
are injected deep into the earth. In a piece for Oilprice.com, John
C.K. Daly reviews the research, dating back many decades, on how deep-injection wells can trigger modest earthquakes.
Read more @ N.Y.Times
Read more @ N.Y.Times
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