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| | Abstract | | The horizontal gravity gradient stack (HGGS), is proposed for the assessment of surface density, and the method is applied with the filtering the horizontal gravity gradient data (Data). The comparison between the HGGS filtered acquired Data and the equivalent calculated response of DEM based surface layer is analyzed for calculation of the surface average density by the moving window correlation (MWC) methods. Its application to the actually acquired Data around the Ogiri geothermal plant in the western Japan is analyzed, and its results fit adequately well for the existing hydrothermal alteration zones as the low surface density area, and the possible prominent distributions of intrusions and lava as the high surface density area. |
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