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The Water Cooler
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Another quake?
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<blockquote data-quote="Perplexed" data-source="post: 4211165" data-attributes="member: 7157"><p>Because fracking is a relatively recent phenomenon, so there’s no data back beyond the past 50 years or so. But if you look at oil production in OK, you can see a roughly similar situation in this graph:</p><p></p><p>[ATTACH=full]450481[/ATTACH]</p><p></p><p></p><p>Basically, the number of earthquakes about magnitude of 3.5 to 4 doubled in the years starting around 2009, with year-to-year frequencies going up as well (red bars). The black stars indicate quakes with a magnitude of 4 or greater; there are three such from the late 1800s to about 1960, and a cluster starting around 2009. The graph doesn’t show the 1997 earthquake in Pontotoc County with a magnitude of 4.5, though. It also doesn’t show well that since 2011, there have been at least 16 quakes with a magnitude of 4.5 or greater, compared to four quakes from about 1880 to 1997.</p></blockquote><p></p>
[QUOTE="Perplexed, post: 4211165, member: 7157"] Because fracking is a relatively recent phenomenon, so there’s no data back beyond the past 50 years or so. But if you look at oil production in OK, you can see a roughly similar situation in this graph: [ATTACH type="full" alt="IMG_6597.jpeg"]450481[/ATTACH] Basically, the number of earthquakes about magnitude of 3.5 to 4 doubled in the years starting around 2009, with year-to-year frequencies going up as well (red bars). The black stars indicate quakes with a magnitude of 4 or greater; there are three such from the late 1800s to about 1960, and a cluster starting around 2009. The graph doesn’t show the 1997 earthquake in Pontotoc County with a magnitude of 4.5, though. It also doesn’t show well that since 2011, there have been at least 16 quakes with a magnitude of 4.5 or greater, compared to four quakes from about 1880 to 1997. [/QUOTE]
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