article_snippet.sent: Man-made quakes jolted once stable regions in eight states, including parts of Alabama, Arkansas, Colorado, Kansas, New Mexico, Ohio, Oklahoma and Texas.
article_snippet.sent: Oklahoma lately has been rocked by more magnitude-3 quakes than California, the most seismically active of the Lower 48 states, Petersen said.
article_snippet.sent: Oklahoma was not on scientists' radar until recently when Oklahoma experienced a spate of quakes, the largest registering a magnitude-5.6 in 2011.
article_snippet.sent: Recently, man-made quakes jolted once stable regions in eight states, including parts of Alabama, Arkansas, Colorado, Kansas, New Mexico, Ohio, Oklahoma and Texas .
article_snippet.sent: Earlier this week, the Oklahoma Geological Survey acknowledged that the Oklahoma Geological Survey is very likely most of the recent shaking is from wastewater disposal.
highlights_snippet.sent: Man-made quakes have hit once stable regions in central and eastern US .
  
highlights_snippet.sent: Man-made quakes include Arkansas, Colorado, Kansas, Ohio, Oklahoma and Texas .
  