none 10.1144/GSL.QJEG.1991.024.04.05 Geological Society of London Geological Society of London 1881 30019445 469754 2024111903323300139 10.1144 2024-11-19T13:27:17Z 2007-11-13T22:12:32Z 13 Quarterly Journal of Engineering Geology QJEGH 0481-2085 05 16 2007 11 1991 24 4 Alvin K. Benson Brigham Young University, Department of Geology and Geophysics, 359C ESC, Provo, UT 84602, USA Nathan Brett Mustoe Brigham Young University, Department of Geology and Geophysics, 359C ESC, Provo, UT 84602, USA Abstract Planning and development along the Wasatch front must compensate for the geological hazards associated with faulting. Studies show that future ruptures will probably occur along already existing zones of weakness. Although any surface faults can be detected by surficial geological mapping others have no visible expression and can only be located by subsurface investigations. Geophysical methods, such as seismic refraction, gravity, magnetic, and radar can be integrated with geotechnical engineering methods such as drilling and trenching to obtain a better understanding of the subsurface geology at a specific site. Seismic refraction, gravity and magnetic surveys conducted near Provo, Utah along the Wasatch Mountain front have helped delineate shallow, concealed faulting. The reduced, modelled gravity and magnetic data typically correlate well with the refraction depth sections generated using the General Reciprocal Method (GRM). Field observations coupled with the geophysical data facilitated the identification of a number of probable faults along Rock Canyon Road, allowing an estimate to be made of the magnitude and direction of throw on the fault. A normal fault associated with a prominent north–south scarp near Rock Canyon Road was chosen for a case study. This fault scarp was later trenched by the Utah Geological and Mineral Survey (UGMS) and provided a direct comparison with the geophysical data sets. As all the data sets at this site correlate well with the subsurface geology, confidence is increased in interpreting other parts of the line. The characteristics of subsurface deformation can be used to gain a better understanding of the potential for surface rupture at a site and thereby in planning and site development and in devising remedial measures to mitigate the effects of earthquakes in populated areas. 06 07 2022 11 1991 375 387 10.1144/GSL.QJEG.1991.024.04.05 https://doi.org/10.15223/policy-002 10.1144/GSL.QJEG.1991.024.04.05 https://www.lyellcollection.org/doi/10.1144/GSL.QJEG.1991.024.04.05 https://www.lyellcollection.org/doi/pdf/10.1144/GSL.QJEG.1991.024.04.05 https://geoscienceworld.org/qjegh/article-lookup?doi=10.1144/GSL.QJEG.1991.024.04.05 Benson A. K. & Baer J. L. 1987. Close Order Gravity Surveys: A Means of Fault Delineation in Valley Fill Sediments. Proceedings of the 23rd Symposium on Engineering Geology and Soils Engineering 219–240. Benson A. K. & Mustoe N. B. 1989. Seismic and Gravity Surveys as Tools in Delineating Subsurface Geology and Assessing Some Geologic Hazards . Proceedings of the 25th Symposium on Engineering Geology and Geotechnical Engineering 25–30. Cluff L. S. Brogan G. E. & Glass C. E. 1973. Wasatch Fault Southern Portion: Woodward-Lundgren and Associates Oakland California . Report prepared for Utah Geological and Mineral Survey Salt Lake City Utah. Introduction to Geophysical Prospecting, Dobrin, M. B. 471 1988 Dobrin, M. B. & , Savit, C. H. 1988. Introduction to Geophysical Prospecting, McGraw-Hill, New York, 471–492, 644–645. Gori P. L. & Hays W. W. (eds) 1987. Earthquake Hazards Along the Wasatch Front Utah . U.S. Geological Survey Open File Report 87–154. Gori P. L. & Hays W. W. (eds) 1988. Assessment of Regional Earthquake Hazards and Risk Along the Wasatch Front Utah Volume III . U.S. Geological Survey Open File Report 88–680. Interpretation Theory In Applied Geophysics: Grant, F. S. 282 1965 Grant, F. S. & , West, G. F. 1965. Interpretation Theory In Applied Geophysics: McGraw-Hill, New York, 282–287. Special Publication 5. Map scale is 1:24,000. Geologic Map of the Y Mountain Area, East of Provo, Utah and cross sections of the Y Mountain. Hintze, L. F. 1978 Hintze, L. F. 1978. Geologic Map of the Y Mountain Area, East of Provo, Utah and cross sections of the Y Mountain. Brigham Young University Geology Studies, Special Publication 5. Map scale is 1:24,000. Special Publication 7, Geologic History of Utah: Hintze, L. F. 7 1988 Hintze, L. F. 1988, Geologic History of Utah: Brigham Young University Geology Special Publication 7, 7–10, 29–32, 77–89. Map scale is 1: 50,000. Preliminary Surficial Geologic Map of the Wasatch Fault Zone, Eastern Part of Utah Valley, Utah Country, and Parts of Salt Lake and Juab Counties, Utah, Machette, M. N. 1989 Machette, M. N. 1989. Preliminary Surficial Geologic Map of the Wasatch Fault Zone, Eastern Part of Utah Valley, Utah Country, and Parts of Salt Lake and Juab Counties, Utah, USGS Misc. Field Studies Map and Pamphlet MF-2109. Map scale is 1: 50,000. 10.1190/1.9781560802426.ch4 Principles of Applied Geophysics: Parasnis, D. S. 70 1962 Parasnis, D. S. 1962. Principles of Applied Geophysics: Methuen, London, 70–71. 10.2172/4409605 Redpath B. B. 1973. Seismic Refraction Exploration for Engineering Site Investigations: U.S. Army Engineer Waterways Experiment Station Explosive Excavation Research Laboratory Technical Report E-73–4. 10.1190/1.1440356 10.3133/ofr81229 Swan F. H. III Schwartz D. P. & Cluff L. S. 1980 Recurrence of Surface Faulting and Moderate to Large Magnitude Earthquakes on the Wasatch Fault Zone at the Kaysville and Hobble Creek Sites Utah . U.S. Geological Survey Open-File Report 80-801 227–275. 10.1190/1.1438687 Applied Geophysics. Telford, W. M., 16 1985 Telford, W. M., , Geldart, L. P., , Keys, D. A. & , Sheriff, R. E. 1985. Applied Geophysics. Cambridge University Press, 16–30, 51–84, 147–181 passim.