TINJAUAN ANALISIS GAYA BERAT TERHADAP BENTUKAN STRUKTUR BAWAH PERMUKAAN DI LEMBAR MEDAN, SUMATERA UTARA

D.A Nainggolan (Pusat Survei Geologi)

Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
Vol. 17 No. 4 (2007): Jurnal Sumber Daya Geologi

Regionally, tectonics of the Medan Quadrangle is occupied by mountainous and back-arc basin zones. Mountainous zone occupies the southwestern of the quadrangles, and is situated in the northwestern part of Kabanjahe, having Bouguer anomaly ranges from -70 to 0 mgals. Zone of back-arc basin occupying more than 50% of the area extends to the east into the Malacca Strait, having Bouguer anomaly ranges from 0 until +20 mgals. The qualitative and quantitative of Bouguer and residual anomalies represent numerous shapes of anticlinal and synclinal structure including faulting system having direction of northwest - southeast. Keywords : mountainous, back-arc basin, Malacca Strait, subsurface structure, Bouguer anomaly