INTERPRETASI BAWAH PERMUKAAN PULAU LEMBATA DENGAN MODEL 3D MENGGUNAKAN METODE GRAVITASI

Bergita Linong, Jehunias L Tanesib, Jonshon Tarigan, Laura Anastasi Seseragi Lapono

Abstract


A research had been done in Lembata Island by using gravity method. The aims of this research are to know the underground surface structure of Lembata Island and also to compare the previous research that used 2D. The data used in this research are free air gravity anomaly data by Sandwell and Smith on 2015. The data are reduced with atmosphere correction, simple bouger correction and curvature correction to get the result of complete bouger anomaly. Complete bouger anomaly is the combination of residual anomaly and regional anomaly so that the separation to the both anomalies is done with the up continuous method at the height of 3 Km. The result of up continuous process is used to the modelling by using Grablox and Bloxer programs. The next is doing the interpretation of the modelling result. The result of gravity field anomaly interpretation shows that Lembata Island has positive anomaly with the result over 0 mgl until 190 mgal. While the result of three dimensions shows that Lembata area has eight rocks type namely sandstone, limestone, dolomite, granite, andesite, diorite, basalt and gabbros. Lembata area also has Caesar at the depth of 4 Km and the depths of 6 Km. The basement rocks of this area is basalt. The comparison result of two dimensions and three dimensions is on the two dimensions only has andesite, granite, diorite and basalt rock.

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