Vertical deformation ground leveling was conducted annually in Mutnovksy during 2004-2013 using a network of well markers. Three types of deformation areas with different transient vertical deformation regimes were identified on the basis of these measurements. The first type of deformation area is located in the central part of the Dachny site, where significant positive vertical deformation (2-5 mm/year) was observed. The second type of deformation area is located in North reinjection site, where some positive vertical deformations (6 – 7 mm/year) took place during 2006 – 2008, while there was no significant vertical deformation observed during 2003-2006, and negative vertical deformations (5-8 mm/year) occurred during 2009-2010. Finally, the third type of vertical deformations is located on Verkhne-Mutnovsky site, where significant subsidence has been taking since 2008 at a rate of 6 – 18 mm/year. Coupled fluid flow and geomechanical simulations with the TOUGH-FLAC simulator were performed using a previously developed TOUGH2 model (Kiryukhin, 2013). THM modeling reasonably explains relative vertical movements during exploitation of the Mutnovsky geothermal field, if considering division of the field by Main Fault into two compartments with different properties for the foot block of the Main Fault.

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