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On 4/18/2008 at , a magnitude 5.4 (5.1 MB, 4.8 MS, 5.4 MW, 5.2 MW, Depth: 8.9 mi, Class: Moderate, Intensity: VI - VII) earthquake occurred 373.2 miles away from the city center On 6/10/1987 at , a magnitude 5.1 (4.9 MB, 4.4 MS, 4.6 MS, 5.1 LG) earthquake occurred 358.4 miles away from Des Moines center On 7/9/1975 at , a magnitude 4.6 (4.6 MB, Class: Light, Intensity: IV - V) earthquake occurred 307.0 miles away from the city center On 9/26/1990 at , a magnitude 5.0 (4.7 MB, 4.8 LG, 5.0 LG, Depth: 7.7 mi) earthquake occurred 375.9 miles away from the city center On 6/28/2004 at , a magnitude 4.2 (4.0 MB, 4.2 MW, Depth: 6.2 mi) earthquake occurred 244.6 miles away from Des Moines center On 7/16/2004 at , a magnitude 3.5 (3.5 MW, 3.3 LG, Depth: 3.1 mi, Class: Light, Intensity: II - III) earthquake occurred 120.4 miles away from the city center The number of natural disasters in Polk County (13) is near the US average (13).