The induced seismicity has been known for over 100 years from earthquakes induced by water reservoirs and mining activity. Especially the mining provides a great insight into triggering and seismicity of faults due to redistribution of stresses as the monitoring network allows 3D distribution of receivers. Since late 1970s new observations of seismicity induced by fluid injections attracted attention, first geothermal projects (hot dry rocks later renamed as enhanced geothermal systems, because rocks are not really dry) and more recently hydraulic fracturing of oil and gas reservoirs. It is instrumental to see how the evolution of opinions on physics of seismicity induced by fluid injections evolved especially in the light of errors assumed by seismologists analyzing the data. A message from this evolution I will try to convey is to use as many measurements as possible while assessing errors of processing carefully before making interpretations.


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