Oklahoma's earthquakes, 2007 to 2016, by year: 41 consecutive hot spots, 3 new ones, and not one intensifying or persistent.

Emerging hot spot analysis puts points into a space-time cube, runs a hot spot test in every bin, and reads each location's series with the Mann-Kendall trend test. The labels follow fixed rules, so they depend on the cube you build: change the time step from years to quarters and most of the same busy places read no pattern detected.