Oklahoma never used to be known for its earthquakes. Before 2009, the state had roughly two quakes of magnitude three and above each year.In 2015, this tally rocketed to more than 900, though it’s calmed since, falling to 304 last year.
Source
https://www.theverge.com/2018/2/14/17011396/ai-earthquake-detection-oklahoma-neural-network
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