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<br />~ ~ f) Based on detailed fault scarp mapping of the Sangre <br /> de Cristo fault segments in San Luis Valley, I <br /> estimate Chat there is approximately a 25% chance <br /> that the recurrence interval for fault ruptures on the <br /> San Luis Segment is less than 10,000 years, a 50% <br />' chance that it is less than 20,000 years, a ;'S% <br /> chance that it is less than 40,000 years and a <br /> 99+% chance that it is less than 100,000year::. <br /> g) Age dating of soils in Rito Seco Creek by Kirkham and <br />' Rogers (1981) places the last fault rupture on the <br /> San Luis segment at between 1,940 and 4,715 years <br /> ago. A semi-Markhov analysis using these data suggests <br />I that the probability that a similar earthquake will <br /> occur on this segment in the next 100 years is Low <br /> (between 0.6 percent and 12 percent). <br /> h) A magnitude 6.8 to 7.0 earthquake on the San Luis <br />' fault segment would likely produce ground shaking <br /> at the mine site of from 60 to 70 percent of gravity. <br />I To lessen the risk of damage to mine facilities, con- <br /> struction should avoid placing facilities astride active <br />i fault features (those which can be seen to offset Holocene <br />t deposits). To every extent possible, facilities should be <br /> placed on the foot wall block of the San Luis fault segment. <br /> <br />t <br /> <br /> <br /> <br /> <br /> <br />17 <br /> <br />