<![CDATA[Bouguer and free air gravity anomalies of the Banda Sea and Seram Island are divided into southren, central and northern parts. Gravity analyses based on land measurement combined with ftee air anomaly data of the sea produce crust structure model which close related to rock composition and tectonic position. Crust structure at Banda Sea is mainly composed of basaltic crust of Banda Sea as a base and folded occurrence, collision with granitic crust border (Australian continent fragment ?). Banda Sea basaltic crust is underlying volcanic sediment Banda Island, while granitic crust is underlying Pre-Tertiary sediment rock at Seram Island. Collision which happened since early Pliocene of two different crust has caused many things such as material from many sources in Seram Island mad melange rock and thrust fault that appeared in the surface. Tectonic intensity has also caused some granitic crust borders to get fragmentation which reduces value of the anomaly. Further-more, it appears volcanic rock of Banda Sea has caused gravity tectonic toward equilibrium process basaltic crust. This geodynamic crust model has an implication to geological Potency product, both in economic or disaster risk.Keywords: gravity, tectonic, evolution, geological potency]]>
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