“Shaking Up the Fracking Debate” gives the impression that earthquakes near hydraulic fracturing wells are due to earthquakes at distant locations (C&EN, July 15, page 8).
That may be true for some locations, but in Denver we had a deep well at the Rocky Mountain Arsenal in the early 1960s. After that well was put into use, earthquakes happened in the Denver area. Property damage occurred, but no one was killed. The epicenter of those quakes was determined to be the well at the Rocky Mountain Arsenal. The well was shut down in 1966, and all the quakes subsided and have since disappeared. Distant earthquakes or not, the well at the Rocky Mountain Arsenal was responsible for the quakes.
Let us be sure to hold accountable the oil companies that engage in fracking for the earthquakes that they cause—like the one that hit Prague, Okla., and leveled 14 homes in an otherwise seismically quiet area.
Perhaps we should rethink how fracking will provide safe and abundant energy. It may not be as safe as we would like it to be.
Robert T. Anselmi
The method uses an underground ventilated control center wherein computer-controlled horizontal drilling is used in multiple directions. The center can be located in the middle of an underground shale deposit. Drilling operations can be conducted for distances of up to a mile or more. Unlike with fracking, pressurized water, hazardous chemicals, and solid proppants are not used. After mining operations are complete, the drilled-out spaces are not abandoned. Waste material from aboveground is transported and placed in the cylindrical spaces. It is envisioned that the waste material will become a source of methane and other valuable chemicals for years into the future.
Leander F. Aulisio