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| | Abstract | | In three-dimensional forward modeling of gravity exploration, the subsurface structure is often discretized by cuboid. But cuboid is not effective for more complicated shapes of anomalous bodies. Therefore three-dimensional forward modeling program of the gravity exploration using the hexahedral element was developed. This program can calculate gravity anomaly by using coordinate transformation and Gauss-Legendre quadrature. Using this program, the models of geological structure of fault, volcano, and caldera were calculated. As an example of the simulation of the three-dimensional subsurface structure, a gravity simulation of Aso caldera was done. The program was confirmed to show accuracy behavior by comparing the measured gravity exploration data and the calculation result by the model. |
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