Hurricane Sandy was not rated on the Richter scale. That scale is for earthquakes, not hurricanes. Hurricane Sandy was a category 3 in the Saffir-Simpson scale, but had weakened to a category 1 by the time it reached the United States..
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Hurricane Katrina was a Category 5 hurricane on the Saffir-Simpson scale, not the Richter scale. The Richter scale measures the magnitude of earthquakes, not hurricanes.
Hurricane Katrina was a Category 5 hurricane when it made landfall in the United States on August 29, 2005. The Saffir-Simpson Hurricane Wind Scale is used to categorize hurricanes based on their sustained wind speeds, not the Richter scale which measures earthquake magnitudes.
Hurricane Sandy was a Category 3 hurricane before making landfall. When Sandy made landfall in New Jersey, the intensity was similar to a Category 1.
Hurricane Sandy peaked as a category 3 hurricane just before making landfall in Cuba. When Sandy made landfall in New Jersey, it was a Category 1.
Like all hurricanes, it was a 12 on the Beaufort Scale. That is as high as the scale goes.