This special section of Geophysics is a consequence of a very successful SEG workshop titled Microseismicity: Beyond dots in a box. The workshop was held 22 October 2010, following the SEG Annual Meeting that was held in Denver. More than 120 people attended the meeting, and nine oral papers and 22 posters were presented.

Small microseismic events, or acoustic emissions, occur naturally and a result of anthropogenic influences in reservoirs. Sudden stress release leads to elastic rock failure, which serves as an effective seismic source. These microearthquakes may be the result of production or hydraulic stimulation, but they also may...

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