Animation of equakes in Okla. & parts of adjoining states, 2004-16. Size of dots and volumes are proportional to equake strengths. #okquake pic.twitter.com/5qmgZKqKs5

— USGS in Oklahoma (@USGS_Oklahoma) July 20, 2017

Come for the startling earthquake data in OK and TX due to hydraulic fracturing a.k.a. “fracking,” stay for the groovy sound effects. https://t.co/K1VzuMII75

— Charlie Vogel (@teleskiguy) July 20, 2017