The city of Karachi, Pakistan (population 14 million), sits close to a plate boundary and within reach of earthquakes on numerous tectonically active structures surrounding the city. One can draw parallels—geologic as well as demographic—with another megacity for which seismic hazard is known to be high: Los Angeles, California (figure 1). Yet with a short historical record, limited instrumental seismic data, and little geological or geodetic constraint on slip rates, seismic hazard in Karachi is poorly characterized. In this report we present a critical review of the historical record as well as an overview of potential earthquake sources...

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