USGS on Man-Made Earthquakes
July 22, 2013 | USGS
"The number of earthquakes has increased dramatically over the past few years within the central and eastern United States. [...] This increase in earthquakes prompts two important questions: Are they natural, or man-made?" Quoted from the USGS blog post.
Oklahoma Earthquake Swarm Continues
October 23, 2013 | USGS
"Since January 2009, more than 200 magnitude 3.0 or greater earthquakes have rattled Central Oklahoma, marking a significant rise in the frequency of these seismic events. [...] The analysis suggests that a contributing factor to the increase in earthquakes triggers may be from activities such as wastewater disposal." Quoted from the USGS press release.
Waste Injection Tremors Triggered by Distant Earthquakes?
July 17, 2013 | Columbia University
"Large earthquakes from distant parts of the globe are setting off tremors around waste-fluid injection wells in the central United States..." Quoted from the Columbia University press release.