Subsurface Structure Interpretation of Southern Flank of Tangkuban Parahu Based on Gravity Method

• Main Author: ABDULLAH (NIM: 22315017), HASDI
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/22395
• Institution: Institut Teknologi Bandung

Tangkuban Parahu is one of strato type volcano which grows in the eastern of Sunda <br /> <br /> <br /> <br /> Caldera. Based on the pattern, the eruption is grouped in three phases. The explosive <br /> <br /> <br /> <br /> phase that produces pyroclastic and lava, The effusive phase produces many lava flows <br /> <br /> <br /> <br /> composed of basaltic andesite, now the volcano is growth phase small explosive, <br /> <br /> <br /> <br /> interspersed phreatic sometimes. Therefore, this volcano is interesting to be studied <br /> <br /> <br /> <br /> related it’s geological phenomenon. A subsurface geological research is essential to <br /> <br /> <br /> <br /> know the description of subsurface structures such as rocks, fracture, and groundwater <br /> <br /> <br /> <br /> encouraging phreatic eruption. Geophysical research use gravity method assessed <br /> <br /> <br /> <br /> effectively and efficiently, to know density of subsurface rock can make up Tangkuban <br /> <br /> <br /> <br /> Parahu based on gravity anomalies on the surface, so the subsurface geological <br /> <br /> <br /> <br /> condition can be prediction by rock density which is known. The research aims to get <br /> <br /> <br /> <br /> Bouguer anomalies map, regional anomalies map and residual anomalies map, and <br /> <br /> <br /> <br /> subsurface geologycal modelling. There are thirty five gravity observation data of <br /> <br /> <br /> <br /> direct acquisition in the field with random pattern spread, from peak to Southern Flank <br /> <br /> <br /> <br /> the dominant spread of data toward the Southern Flank. Regional and Residual <br /> <br /> <br /> <br /> anomalies separation using the 2D fast fourier transform lowpass filter method. The <br /> <br /> <br /> <br /> quantitative interpretation of subsurface geological by forward modelling. This <br /> <br /> <br /> <br /> investigation gives better understanding on the subsurface structure of Southern Flank <br /> <br /> <br /> <br /> of Tangkuban Parahu Volcano, there are two normal faults, based on cross section A <br /> <br /> <br /> <br /> to B and C to D, comonly, there are two units of rock make up Tangkuban Parahu, <br /> <br /> <br /> <br /> Consits of old volcano product and young volcano product.