TEMPERATURE VERSUS DEPTH GRADIENT MODELLING IN THE FLORES ISLAND, EAST NUSA TENGGARA

• Main Author: Irania Aradat, Nerjisya
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/57931
• Institution: Institut Teknologi Bandung

Flores Island, East Nusa Tenggara is included in the eastern part of Indonesia which has quite complex tectonic conditions. One of the consequences of the tectonic events that occurred was the discovery of a subduction zone in the Sunda Arc which extends from the western part of the island of Sumatra to the southern part of the island of Java and Nusa Tenggara. This incident caused a series of volcanoes, especially in the Flores Island area. The number of volcanoes scattered in the area causes the emergence of geothermal potential. Geothermal potential in the subduction zone occurs because it is influenced by the flow of heat originating from the friction of the two plates. In addition, the distribution of heat flow can also be used to estimate the temperature inside the Earth, assisted by several parameters such as thermal conductivity and radioactive heat. In this final project research produces a geothermic gradient by using the solution method of the 4-layer model of the geothermic equation on the cross-sectional line B'-B, the cross-section passes through the Flores Sea, Flores Island and Savu Sea, East Nusa Tenggara which has been divided into 12 section. Based on the results of the processing shows that the temperature distribution in the study area varies greatly and depends on the geological conditions. The highest temperature distribution is in an active volcanic area, namely in the Flores area on section 6 due to the influence of partial melting which is at a depth of 70 km and is under the volcano. In addition, the factors that influence it are also the values of the three parameters are higher than other areas, the value of heat flow is around 42 m/Wm2, the value of thermal conductivity in each layer is around 2,7-3,2 W/m°C and radioactive heat is around 0,65-2,8 ?Wm3at a depth of 70,5 km. The higher the temperature, the value of radioactive heat and the distribution of heat flow will also be higher and will decrease with increasing depth, but on the contrary, the thermal conductivity is higher and the pressure increases and the depth increases, the value will increase.