THE USE OF TRI-GEOPHYSICAL METHODS FOR CONCEALED KARST CAVITIES LOCATION NEAR HAQLANYIAH TOWN

Abstract

The main objective of the present work is to find, locate and delineate some
subsurface morphological structures at area near Haqlanyiah town lying in the
western part of Iraq, either as an isolated karst cavity features or as buried channel
features by using three different geophysical methods, representing by
electromagnetic conducting method, VLF-Radiohm electromagnetic resistivity
method and electrical resistivity method with horizontal profiling using wenner
array. The study area accupies an area (100x300m) and the survey was carried out
along thirty one traverses with (10m) separation and (10m) grid interval. The
elaborated field data were subjected to the process of analysis, a great coincidence
between method results is obtained, then the results show a presence of two
anomalous zones in which its characteristic features gave an indication of a presence
two possible elongated concealed channels trending in two different directions as in
E-W and NW-SE