Research Article| January 01, 1979 Review of Geophysical Approaches to the Detection of Karst ROY J. GREENFIELD ROY J. GREENFIELD Roy J. Greenfield is with the Department of Geosciences, The Pennsylvania State University, University Park, Pa. 16802. Search for other works by this author on: GSW Google Scholar Environmental & Engineering Geoscience (1979) xvi (3): 393–408. https://doi.org/10.2113/gseegeosci.xvi.3.393 Article history first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation ROY J. GREENFIELD; Review of Geophysical Approaches to the Detection of Karst. Environmental & Engineering Geoscience 1979;; xvi (3): 393–408. doi: https://doi.org/10.2113/gseegeosci.xvi.3.393 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyEnvironmental & Engineering Geoscience Search Advanced Search Abstract Geophysical methods have been used for many years to detect subsurface voids and fractures. These techniques include seismic reflection, seismic refraction, seismic surface waves, gravity, D.C. electrical resistivity, electromagnetic radar, heat flow, cross bore hole methods, and various remote sensing methods.This paper describes the various geophysical principles. In actual application geophysical surveys give results which are either successful, unsuccessful or ambiguous. Examples of geophysical surveys will be shown. Why these surveys were successful in locating voids in some cases while in others they were not will be discussed. In particular, results will be given to show the size of geophysical field anomalies that result from cavities and compare these to the normal level of ‘geologic noise’ that is present due to normal variations of subsurface physical properties. One particular result from field studies is that in some cases anomalies have been observed which are much larger than can be explained by the size of the void or fracture. An explanation for the anamolies is that the properties of the soil and rock surrounding the void are charged by anomalous drainage through the void. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.