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<br /> additi,~naL e=fort should comprise the Lollowing three goals: <br /> 1. Improve knowledge of the tectonics of the Rio Grande <br /> Rift south of San Luis Valley to place the faulting <br /> in perspective relative to the main Rio Grande Rift. <br /> This knowledge will aid in assessing whether this <br /> portion of the rift is anomalous, what typical Rift <br /> earthquakes look Like in terms of magnitude, ssperity <br /> size, stress drop, moment etc. <br />2 <br />I <br />f th <br />k <br />l <br />d <br />f <br />lt <br />i <br />h <br />l <br />h <br /> . <br />mprove <br />now <br />e <br />ge o <br />e <br />au <br />scarp morp <br />o <br />o,~y <br />n t <br />e <br /> San Luis segment of the Sangre de Cristo foul=. At the <br /> present time too little is known about the fa»Lt scarps <br /> in the vicinity of the project. This knowledge will <br />' help to determine a) whether the entire segment tends <br /> to rupture at once or whether smaller segment:; rupture <br /> at different times (few Large magnitude event:; or many <br /> smaller magnitude events), b) whether scarp ages can <br /> be more accurately determined and c) whether scarp <br /> heights measured by Kirkham and Rogers are accurate, or <br /> are influenced by thousands of years of erosion. <br /> 3. Perform a semi-Markhov probability analysis s)~ecifically <br /> for the Sangre de Cristo fault using data fron 1 and 2 <br /> above. <br /> I suggest that the first step be to review published data <br /> related to these three goals. There has been a significant amount <br /> of information published on Rio Grande Rift seismicit}' and <br /> tectonics that I have been unable to review in this slcort period <br /> of time. I am also aware of several theses at the University <br /> of Arizona and Colorado School of Mines that bear dirE~ctly <br /> on the tectonics and Quaternary faulting in San Luis l'a11ey. If <br /> this step provides adequate information for an earthgL~ake hazard <br /> analysis,an analysis will be performed and a report prepared. <br /> If the available literature does not deal with tFe <br /> Quaternary fault geomorphology in sufficient detail tc assess <br /> the possibilities outlined above, I shall recommend a one week <br /> field phase to acquire the necessary information. <br /> <br />11 <br />