Karst
The Geosciences Division of the Mines and Geosciences Bureau, Regional Office No. XI has recently completed the ground penetrating radar survey (GPR) of parts of Shrine Hills and Brgy. Langub on October 19-23, 2015. This activity is in line with the current program of the MGB under the karst subsidence mapping and assessment which aims to identify portions of the country which is susceptible to sinkhole collapse and other ground subsidence within karst terrain. The GPR equipment is designed to image the subsurface and locate solution cavities underground that is not visible on the surface as these grounds may be prone to collapse.