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What was the magnitude of the initial shock of the Haiti earthquake?

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The initial shock registered a moment magnitude of 7.0. In context, the main shock was followed by two aftershocks of magnitudes 5.9 and 5.5. More aftershocks occurred in the following days, including another one of magnitude 5.9 that struck on January 20 at Petit Goâve, a town some 35 miles (55 km) west of Port-au-Prince.