The seismic moment of the 1994 Northridge (LA) earthquake was 2×10^10 N-m. The s

The seismic moment of the 1994 Northridge (LA) earthquake was 2×10^10 N-m. The slip appears to have been 1.5 meters. How big was the fault area that slipped? Please help me understand how to get the area and explain how I can give my answer in km^2
The formula for a seismic moment is: Mo=μ

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