Two of the most devastating earthquakes in the San Francisco Bay area occured in 1906 along the San Andreas fault and in 1909 in the Santa Cruz Mountains near Loma Prieta peak. The 1906 and 1909 earthquakes measured 8.3 and 6.9 on the Richter scale, respectively. How much greater was the intensity of the 1906 earthquake compared to the 1989 earthquake? (Round your answer to two decimal places.)

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