Investigating underground cavities is vital due to their potential for
subsidence and total collapse. One of the proven geophysical methods for
locating underground cavities at a shallow depth is ground penetrating radar
(GPR). GPR uses contrasting dielectric permittivity, resistivity, and
magnetic permeability to map the subsurface. The aim of this research is to
prove that GPR can be applied to detect underground cavities in the Japan
Cave of Taman Hutan Raya Djuanda, in Bandung, Indonesia. Forward modeling
was performed first using three representative synthetic models before field
data were acquired. The data acquisition was then conducted using a 100 MHz
GPR shielded antenna with three lines of 80 m and one additional line 10 m
long. The result showed a region of different reflection amplitude, which
was proven to be the air-filled cavities.
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