Earthquakes are increasingly being linked to drilling activities, whether it is for gas or oil, or for the disposal of waste materials.
- - 1726 - [April 21, 2015] - Los Angeles Daily News - Earthquakes, Alicia Chang, The Associated Press - "Oil, gas drilling triggers earthquakes in over a dozen areas in the US"
- "More than a dozen areas in the United States have been shaken in recent years by small earthquakes triggered by oil and gas drilling, a government report released Thursday found.
The man-made quakes jolted once stable regions in eight states, including parts of Alabama, Arkansas, Colorado, Kansas, New Mexico, Ohio, Oklahoma and Texas, according to researchers at the U.S. Geological Survey.
Experts said the spike in seismic activity is mainly caused by the oil and gas industry injecting wastewater deep underground, which can activate dormant faults. A few instances stem from hydraulic fracturing, in which large volumes of water, sand and chemicals are pumped into rock formations to free oil or gas."
- - 1746 - [April 2015] - abc NEWS, Seth Borenstein AP Science Writer - "Study Links Swarm of Quakes in Texas to Natural Gas Drilling"
- " With real-time monitors, scientists have linked a swarm of small earthquakes west of Fort Worth, Texas, to nearby natural gas wells and wastewater injection.
In 84 days from November 2013 to January 2014, the area around Azle, Texas, shook with 27 magnitude 2 or greater earthquakes, while scientists at Southern Methodist University and the U.S. Geological Survey monitored the shaking. It's an area that had no recorded quakes for 150 years on faults that "have been inactive for hundreds of millions of years," said SMU geophysicist Matthew Hornbach.
When the volume of injections decreased significantly, so did the shaking."
- - 1747 - [April 21, 2015] - abc NEWS, TIM TALLEY Associated Press - "Oklahoma Geology Group Links Earthquakes to Oil Waste Wells"
- " The Oklahoma Geological Survey said Tuesday it is "very likely" that most of the state's recent earthquakes were triggered by the subsurface injection of wastewater from oil and natural gas drilling operations.
Geologists have been studying the cause of hundreds of earthquakes that have shaken the homes and the nerves of residents in central and north-central Oklahoma, where the pace of oil and gas drilling has accelerated in recent years.
A statement released by state geologist Richard D. Andrews and Dr. Austen Holland, state seismologist, said the rate of earthquakes and geographical trends around major oil and gas drilling operations that produce large amounts of wastewater indicate the earthquakes "are very unlikely to represent a naturally occurring process.""
- - 1748 - [April 21, 2015] - abc NEWS, Evan Simon - "Oklahoma Admits Oil and Gas Industry Responsible for Dramatic Rise in Earthquakes"
- " For the first time in the state's history, Oklahoma’s state government officially recognized the long held scientific consensus linking the disposal of oil and gas wastewater with the record number of earthquakes plaguing it in recent years.
On Tuesday, the Oklahoma Geological Survey released a statement declaring it was “very likely that the majority of recent earthquakes, particularly those in central and north-central Oklahoma, are triggered by the injection of produced water in disposal wells.” "