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A detailed forensic analysis of field fractures of Eccentrically Braced Frames (EBFs) is presented. These fractures, which occurred during the February 22, 2011 Christchurch, New Zealand earthquake are the first field fractures observed in EBFs worldwide. Material from the fractured frames, including the fracture surfaces were obtained as part of this study. Thus, detailed assessments could be made of the various factors that contributed to the observed failures. The study encompasses frame simulations of the constructed frames, continuum finite element simulation of the details and material tests to establish fracture toughness of the material. The data from these tests and simulations is synthesized to ascertain the relative effects of various factors (frame design, detailing, material properties, and ground motion intensities) and to propose strategies for mitigating future occurrences.