An automatic procedure of grouping the events was applied based on their locations (a plane) and the consistency of their acceptable fault plane solutions (plane orientation similar to the spatial plane and similar slip directions).
Of the 470 events within the group the automatic algorithm included 115 events within 15 groups. For each of these 115 events we thus have a proposed unique fault plane.
These groups define a compliceted set of fractures with defined strikes and dips. These are indentified with known fracture and rift zone directions on the surface.