Abstract
Gravity anomaly data is used in modelling the Lawu volcano fault. The fault modelling uses a total of 10,126 data points for free air anomaly GGMplus 2013 from http://ddfe.curtin.edu.au/ with a north-south direction with a grid of ± 200 meters. Separation of regional and residual anomalies using a moving average filter and Modelling using the forward modelling method. The modelling results show the distribution of rock densities of 2.52 gr/cm3 and 2.25 gr/cm3, which are composed of tuff and breccia with lava insertion, andesite lava with a density of 2.48 gr/cm3 and 2.9 gr/cm3, tuff lapilli, and pumice stone with a density of 2.35 g/cm3 and the last is andesite and basalt rocks with a density of 2.94 g/cm3. The modelling results also show two faults, namely the Sidoramping-Lawu normal fault and the Cemorosewu fault. From the type of rock and the location of the fault, it can be seen that Mount Lawu is an area highly vulnerable to landslides.
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