ANALISIS DATA MAGNETIK DI SEKITAR DANAU LINAU, LAPANGAN PANASBUMI LAHENDONG, SULAWESI UTARA ANALYSIS OF MAGNETIC DATA IN AROUND LINAU LAKE, LAHENDONG GEOTHERMAL FIELD, NORTH SULAWESI
FAIZAL, IRFAN MOCHAMAD AGUS, Ari Setiawan
2014 | Skripsi | FMIPALinau Lake is located in the Lahendong geothermal field area, Tomohon, North Sulawesi. Linau Lake area there are several geothermal manifestations such as fumaroles and hot water. Measurement of magnetic method aims to determine subsurface conditions in the area of Linau Lake. The measurement of magnetic method has been done for 4 days, measurement space of 20 meters, and using the PPM Geotron G-5 and PPM Geomteric G-856. Measurement of magnetic methods has been done in three areas with amount of stations are 87 stations. Area 1 (west) has 45 stations, area 2 (north) has 22 stations, and area 3 (east) has 20 stations. Data processing started by correcting IGRF and diurnal variation to achieve total magnetic filed anomaly. Then, upward continuation to height 25 meters above ground level. The result of upward continuation is regional anomaly. The residual anomaly is get by subtracting the total magnetic anomaly and regional anomaly. Data Interpretation has been done qualitatively and quantitatively. Qualitative interpretation has been done by analyzing the residual anomaly map. Quantitative Interpretation has been done by residual anomaly modeling using Geosoft program. The result of qualitative interpretation is location of the objects that causes anomalous based on the residual anomaly map. The result of quantitative interpretation are models of the subsurface and the value of suspetibilties. The result of modeling and the value of suspetibilties (k) which calculated in the SI for each areas are area 1 (error 6.881%) has tuff (0.0000005), andesite (0.000012), basaltic (0.000032), and microdiorite (0.000051). Area 2 (error 1.458%) has tuff (0.000002), andesite (0.0000053), basaltic (0.00003), and microdiorite (0.000025). Area 3 (error 5.24%) are tuff (0.00001), andesite (0.0008), basaltic (0.00006), and microdiorite (0.000001).
Kata Kunci : Linau Lake, Geothermal, Lahendong, Magnetic Method, Suseptibility.