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###EQCORRSCAN  ##Clustering  Match filter detection techniques are computationally expensive when applied across large datasets. The expense is multiplied as more earthquakes are added to the list of desired detectors (referred to by Barrett and Beroza as the design set) \cite{Barrett_2014}. At the same time, it is important that the design set effectively represent the variety of sources present in a given study area or risk missing what might be important seismicity. To address this, we use acombination of a  hierarchical clustering technique with to create groups of similar events. These groups are then represented by  a series of subspace detectors. The maximum size of the design set of earthquakes for this study is roughly 700 events, representing the entire catalog for Ngatamariki/Rotokawa for the study period. To reduce that number to a manageable size, we cluster the events based upon event-event cross correlation coefficients.  ##Subspace Detection