Active faults and seismic hazards to infrastructure at Great Sand Dunes National Monument and Preserve: Final report, version 2.0
McCalpin JP and GEO-HAZ Consulting, Inc.. 2006. Active faults and seismic hazards to infrastructure at Great Sand Dunes National Monument and Preserve: Final report, version 2.0. Crestone Science Center, Inc.
This report is the final report for 2 seismic hazard studies conducted at GRSA between June 2002 and Dec. 2005. For the first study (Cooperative Ecosystem Studies Unit, CESU COOPERATIVE AGREEMENT No. CA-1200-99-007 grant to Crestone Science Center/Utah State University), a preliminary report was issued on Nov. 30, 2003 covering the trenching investigations of 2002 and 2003. At that time most of the radio carbon and luminescence age dates had not yet been processed, so the ages of paleoearthquakes were estimated mainly from stratigraphic relationships. This final report contains 9 new radiocarbon dates and 5 new luminescence age estimates, and a revised interpretation of paleoearthquake timing.The second study (SEPAS, Project GRSA 59921 ) aimed at collecting additional dating information, and describing the specific seismic hazards to GRSA infrastructure from surface fault rupture, ground shaking, liquefaction, and shaking-induced landslides.The specific hazards were analyzed from geologic mapping data originally collected between 1978 and 1980 (McCalpin, 1981, 1982) updated by additional observations from 1991 to 1992 (hydrology of Medano Creek; McCalpin, 1991, 1992a, 1992b) and 2002 to 2005.