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Sliding in the Farmington Siding Landslide Complex, Davis County, Utah

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Sliding in the Farmington Siding Landslide Complex, Davis County, Utah Hylland, Lowe LIQUEFACTION CHARACTERISTICS,CHARACTERISTICS, TIMING,TIMING, ANDAND HAZARDHAZARD POTENTIALPOTENTIAL OFOF LIQUEFACTION-INDUCEDLIQUEFACTION-INDUCED LANDSLIDINGLANDSLIDING ININ THETHE FARMINGTONFARMINGTON SIDINGSIDING LANDSLIDELANDSLIDE COMPLEX,COMPLEX, DAVISDAVIS COUNTY,COUNTY, UTAHUTAH by Michael D. Hylland and Mike Lowe - INDUCED LANDSLIDING, FARMINGTON SIDING LANDSLIDE COMPLEX, DAVIS COUNTY, UTAH UGS Special Study 95 UTAH COUNTY, SIDING LANDSLIDE COMPLEX, DAVIS INDUCED LANDSLIDING, FARMINGTON Aerial view looking northwest along Interstate 15, showing hummocky landslide terrain on northern part of Farmington Siding landslide complex. Backhoe trench excavated on a hummock sideslope within the Farmington Siding landslide complex, with the Wasatch Range Trench exposure of liquefied sand and in the background. Block of organic soil incorporated into disrupted silt interbed. landslide deposits during landsliding. SPECIAL STUDY 95 1998 UTAH GEOLOGICAL SURVEY a division of Utah Department of Natural Resources CHARACTERISTICS, TIMING, AND HAZARD POTENTIAL OF LIQUEFACTION-INDUCED LANDSLIDING IN THE FARMINGTON SIDING LANDSLIDE COMPLEX, DAVIS COUNTY, UTAH by Michael D. Hylland and Mike Lowe Research supported by the U.S. Geological Survey (USGS), Department of the Interior, under USGS award number 1434-94-G-2498. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. Government. SPECIAL STUDY 95 1998 UTAH GEOLOGICAL SURVEY a division of Utah Department of Natural Resources CONTENTS Abstract . 1 Introduction . 2 Previous Work . 2 Geology and Geomorphology . 3 Trench Descriptions . 4 Trench FST1 . 5 Trench FST2 . 7 Trench FST3 . 7 Trench FST4 . 7 Trench FST5 . 11 Slope-Failure Modes and Extent of Internal Deformation . 11 Geotechnical Properties . 11 Geomorphology . 14 Structure . 14 Landslide Timing . 16 Geomorphic Expression of Landslide Features . 16 Great Salt Lake Shorelines . 16 Soil-Profile Development . 16 Radiocarbon Ages . 17 Episodes of Landsliding . 19 Geologic/Hydrologic Conditions During Landsliding . 20 Seismic Considerations . 20 Earthquake Magnitude-Distance Relations . 21 Peak Ground Accelerations and Critical Accelerations . 21 Liquefaction Severity Index . 23 Estimated Newmark Landslide Displacements . 24 Fault-Zone Paleoseismicity . 26 Hazard Potential . 27 Conclusions and Recommendations . 28 Acknowledgments . 29 References . 30 Appendix A: Descriptions of Trench Units . 34 Appendix B: Radiocarbon Analyses and Calibrations . 38 ILLUSTRATIONS Figure 1. Location of the Farmington Siding landslide complex . 2 Figure 2. Simplified geologic map of the Farmington Siding landslide complex . 3 Figure 3. Pleistocene lacustrine deposits of Lake Bonneville . 4 Figure 4. Hummocky landslide terrain on northern part of Farmington Siding landslide complex . 4 Figure 5. Locations of trenches excavated on the Farmington Siding landslide complex . 5 Figure 6. Trench FST1, excavated on a hummock sideslope . 6 Figure 7. Log of trench FST1 . 6 Figure 8. Trench FST2, excavated on the landslide scarp . 8 Figure 9. Log of trench FST2 . 8 Figure 10. Trench FST3, excavated between two high points on a large hummock . 9 Figure 11. Log of trench FST3 . 9 Figure 12. Liquefied sand injected along fault plane in trench FST3 . 9 Figure 13. Trench FST4, excavated on a hummock sideslope . 10 Figure 14. Log of trench FST4 . 10 Figure 15. Shallow ground water in test pit C of composite trench FST5 . 12 Figure 16. Log of trench FST5.
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