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Maumere at the north coast of Flores Island has experienced not only large earthquakes but also tsunamis. The earthquake sources in this area include thrust faults (north of the island, Timor Trough, and Sawu Basin), strike-slip fault at the west of the island, and Australian Plate subduction-related movements. In this paper, we reviewed all tectonic aspects and studies on a previous large earthquake. A thorough study of all possible sources and probability seismic hazard analysis indicated that events caused by the Flores back arc thrust has the highest possible effect to the ground attenuation in Maumere.