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FIGURE E.2 Graph shows b values for two different microearthquake populations during a hydraulic fracture treatment. The b values vary from about 1 for reactivated tectonic microseismic events and 2 for microseismicity associated with the hydraulic fracture injection. The hydraulic fracture microseismic magnitudes are typically very small (less than M 0), hence the lack of larger microseismic events on this b value example. SOURCE: From Wessels et al. (2011).

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