Influence of pore-pressure on the event-size distribution of induced earthquakes

摘要: [1] During an Enhanced Geothermal System (EGS) experiment, fluid is injected at high pressure into crystalline rock, to enhance its permeability and thus create a reservoir from which geothermal heat can be extracted. The fracturing of the basement caused by these pore-pressures associated with microseismicity. However, relationship between magnitudes induced seismic events applied injection rates, pore-pressure, unknown. Here we show how pore-pressure linked frequency–magnitude distribution, described slope, theb-value. We evaluate dataset EGS in Basel, Switzerland compare observed event-size distribution outcome minimalistic model evolution that relates event-sizes differential stressσD. observe decrease b-values increasing distance point likely pore-pressure. This leads increase probability large magnitude event time.