| dc.description.abstract | Research area "X" is a volcanic area with an interesting of volcanic features in particular
the form of caldera structures due to repetition of volcanic eruptions since thousands of
years ago. The structure of caldera forms a continuous pattern which change due to
endogenous and exogenous forces over time. This study is conducted to see the pattern of
caldera’s continuity at the subsurface (laterally and vertically) as information that can be
used for geothermal exploration, volcanological study as well as seismicity study. In this
study, three-dimensional gravity inversion and Euler deconvolution methods were used to
obtain the density, position, and depth of the anomaly. On the inversion processing we first
run a synthetic data to test the algorithm used in the Grablox software and also to see the
response of the inversion result. The inversion algorithm used in this study are Singular
Value Decomposition and Occam. Based on the results of data processing and modelling,
there are two continuous structures of caldera wall at a depth of 160 to 890 meters which
are shown by a circular structure with a density value of 2.53 g/cc as the first caldera and
another circular structure with a density value of 2.97 g/cc as the second caldera. It is
interpreted that both caldera consist of the same basaltic andesite lithology. | en_US |
