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#Known seismicity  Microseismicity has been observed at Rotokawa since the start of deep injection in 2005 \cite{Sherburn_2015} and at Ngatamariki since injection operations began in 2012 \cite{Sherburn&Bourguignon_2013}. Some of this activity is accounted for by background, natural seismicity associated with the geothermal fields' location within the tectonically dynamic TVZ. However, a much larger part of the microseismicity at Ngatamariki and Rotokawa is due to changes in the reservoir associated with deep fluid injection. Critically stressed and favourably oriented fractures within and adjacent to the geothermal resource can be activated by both pressure changes induced by power plant operations as well as thermal contraction of the hot reservoir rocks as the cooler condensate and brine is injected \cite{Sherburn_2015}. At Rotokawa and Ngatamariki, pressure draw down through most of the reservoir suggests that thermal contraction may be the dominant source of microseismicity in areas not immediately adjacent to injection wells, which are subject to localized pressure increases on the scale necessary to generate microearthquakes \cite{Sherburn_2015}.  At Rotokawa, the largest portion of microseismiciy since 2012 has been located in the southeast portion of the field as discussed in \cite{Sherburn_2015}, within the polygon shown in \ref{Figure2}. Much of this seismicity is likely related to the Central Field Fault which divides the injection and production areas at Rotokawa and acts as a barrier to cross-strike movement of reservoir fluids \cite{Sherburn_2015}.