Sifat-Sifat Fisika Batuan Pulau Biak dan Pulau Supiori, Irian Jaya


  • W.H Simamora



The stratigraphical units of Biak, Irian Jaya Quadrangle, scale 1:250.000 consist of the Tertiary volkanic and sedimentary rocks, the pre-Tertiary metamorphics and recent alluvial. The studied area is in Biak and Supiori Islands, Irian Jaya bounded by longitudes 135°45' - 136°23'E and latitudes 0°36' - 1°36'S. Thirty six rock samples from investigated area have been collected and analyzed in a laboratory. The physical characteristics of samples analyzed include density (?), porosity (ô), magnetic susceptibility (?), and velocity of seismic wave ( Vp and Vs ). The result shows that the value of densities are within the range of 1.86 - 2.60 gr/cc, permeability -6 2.31 - 35.27%, magnetic susceptibilities are whitin 2,2 - 32,23 x 10 cgs emu The value of wave velocities (Vp) are around 2.2 - 5.4 km/sec, and Vs are within 1.1 - 3.1 km/sec. The result of rock samples analysed in area indicates that density distribution of less than 2.0 gr/cc and permeability distribution of > 20% may have high degree of water saturation.


Keywords : Rock physical, density, porosity, magnetic susceptibility, velocity of seismic wave


Download data is not yet available.


Heryanto, R., 1990. Kerentanan Magnetik Awal dan NRM Batuan, seminar KBK Jurusan. Fisika FMIPA, ITB.

Hoshino, K., 1978. Physical Properties density and porosity, In: Untung, M. and Sato, Y. Gravity and Geological Studies in Jawa, pp. 145-158, The Geological Survey of Indonesia.

Masria M., Ratman N., Suwitodirjo K., 1981, Geologi Lembar Biak, skala 1:250.000, Pusat Penelitian dan Pengembangan Geologi

Untung, M. dan Akil, G.S., 1978. Physical Properties Seismic wave velocities, In : Untung, M. and Sato Y. (ed.) Gravity and Geological Studies in Jawa, pp. 158-160, The Geological Survey of Indonesia.