Imaging of karst cave using ground penetrating radar and electrical resistivity tomography: a case study in Shandong, China

Abstract A denudation-dissolution hilly area about 20km southeast of Jinan city, Shandong Province, China is characterized by karst features. The upper part the covered quaternary Holocene flood and slope deposits, lower bedrock Ordovician limestone, which a moderately weathered massive structure with developed joints fissured fractures, solution grooves can be seen locally. local government to better serve surrounding residents facilities, here planned for substation, later security construction, electrical resistivity tomography (ERT) method ground penetrating radar (GPR) were used investigate underground caves. aim joint use two methods describe characteristics landform, 160 MHz shielding antenna was employed in GPR survey, while frequency limits scope depth electromagnetic waves reach. However, it provides lot shallow stratigraphic information, well represents boundary between overburden development karst. ERT further makes up defects method, two-dimensional imaging distribution carried out, also helps identify combination geophysical accurately delineate karst, proves that has good application value landform detection, applied similar geological survey.