Laserfiche WebLink
<br />CONCLUSIONS AN!1 RECOMMENDATIONS <br />1 <br /> Co nclusions drawn from this study are as follow: <br /> a) The San Luis fault segment of the Sangre de Cristo fault <br /> zone displays the same historical seismicity, struct- <br /> ural style and tectonic history as the rest of the <br />' Rio Grande Rift. Hence, there is good reason to <br /> expect that this segment of the rift will behave the <br /> same as adjacent segments to the north and s~~uth. <br /> b) The Sangre de Cristo fault displays less single event <br />' fault segmentation than faults of the central and <br /> southern rift. This may result from the increased <br /> uplift in this area relative to the central and south- <br /> ern portions of the rift; it may also be the result <br /> of inadequate studies of single event fault segment- <br />' ation. Although segmentation has not been adequately <br /> studied in San Luis Valley, there is good suE~port for <br /> single event surface ruptures in the past extending <br /> for 25 to 50 km. <br />' c) Based on studies in other portions of the Rio Grande <br /> Rift (for example, Machette, 1986) a reasonable depth <br /> limit for fault rupture is approximately 12 km. <br /> d) Detailed investigations of fault scarp morphology <br /> indicate that weathering since the last surface <br />' rupture has enhanced the size of the most recent fault <br /> scarps as much as 15 percent. A reasonable e~timate~of <br /> the maximum single event displacement in futc.re earth- <br /> quakes based on corrected scarp heights is 2.0 m. <br />' This seems to be consistent with results frort. detailed <br /> studies of scarps north and south of the San Luis fault <br /> segment. <br /> e) Using the above information on potential fault rupture <br /> length, depth and displacement, a moment magnitude <br /> ML= 6.8 to 7.0 is probably the maximum earthquake that <br /> can be expected on the San Luis segment in the future. <br /> <br /> <br />16 <br /> <br />