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Earthquake Below is a CO-OEM map displaying historical epicenters. ., ____ ..'1"-.--:' . "":l..... - '~ !IIo: II~ ::..... .. ... ... ~ ~c.. ...,j-,j Q ~ .~.. .~~.;~ Mi.. ~~__-_., This map does not display many occurrences within the planning area and does not provide much detail or accuracy in terms oflocation. However, the Planning Team was able to document 5 earthquakes within the planning area within a 123-year period (1870-1993) using a different, but non-reproducible CO-OEM map: · Cheyenne County, East of Kit Carson, S. of 40, between 1962-1993; 2.0-2.9 · Elbert County, south of Elizabeth, between 1962-1993; 3.0-3.9 · Kit Carson County, SE of Burlington, between 1962-1993; 3.0-3.9 · Lincoln County, near Lincoln/Crowley County line); between 1870-1961 · Weld County, east of Kersey, between 1962-1993; 3.0-3.9 (Source: Earthquakes and Related Hazards in Colorado, 1993 CO-OEJvf map) Based upon this data, a recurrence interval of one earthquake every 25 years can be estimated. While that is a moderately frequent recurrence interval, no earthquake within the planning area was greater than 3.9, and there is no record of damage associated with any of these events. The CGS describes northeastern Colorado as a region of minor earthquake activity --- essentially "aseismic." The USGS seismic mapping center delineates northeastern Colorado as a region of minor ground shaking potential --- less than the force of an automobile turning a corner that tumbles a stack of papers on the rear seat. The risk of a maj or/devastating earthquake in the planning area is minimal. Landslide Northeastern Colorado is a relatively flat area with great expanses of open space between communities. The open space is dotted with farms and ranches. While there are hills and gulleys, most Planning Team members mused about where a landslide could even occur. The Planning Team investigated landslides however, because of the following CO-OEM map. 20