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Table 1 Summary of possible triggers for Mqs1, 2, and 3

From: Triggering processes of microseismic events associated with water injection in Okuaizu Geothermal Field, Japan

  Mqs1 Mqs2 Mqs3
Location Periphery of fracture zone Periphery of fracture zone Inside fracture zone
Period During injection During injection After injection stopped
Diffusion process Yes Yes Yes
Water flow model Yes Yes Unclear
Other possible triggering factors   Pressure fluctuation due to changes in injection rate Phase transition of water (liquid to gas)