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F.ARTiISUAF.E CONSIDERATIONS <br />Creede is located in an area designated as <br />Zone 1 on the seismic risk map prepared by the ESSA/ <br />Coast and Geodetic Survey, issued in January 1969. Gen- <br />erally, earthquakes in Zone 1 areas are relatively small <br />in magnitude and infrequent. A literature search indi- <br />cated that no major earthquakes have been recorded within <br />recent history in the vicinity of Creede. However, sev- <br />eral small tremors have been felt in the area. The <br />largesL of these probably induced a ground acceleration <br />of Less than S percent gravity, based on reported damage. <br />For this study, we analyzed the stability of <br />tlir embankment for a static condition with no horizontal <br />loitding and for a pseudostatic horizontal loading condi- <br />tion of 10 percent gravity. Stability under this as- <br />rinmed loading condition should be indicative of stability <br />with any earthquake which is likely to occur at the site. <br />kE.Sltl.TS OF ANALYSES <br />For the static condition, our analyses indi- <br />'"t.e that the embankment has a minimum factor of safety <br />of 1.42. The circular arc representing this condition <br />f" "Ito`''" graphically on Plate ?. For the pseudostatic <br />OAMas C Moame <br />