MODELLING SUBSURFACE STRUCTURE BASED ON MAGNETIK DATA TO IDENTIFY THE PRESENCE OF MAAR LAKE: CASE STUDY OF SETUPATOK RESERVOIR AREA, CIREBON DISTRICT
Maar lakes are formed from a series of small-scale eruptions, which occur when magma rises to the surface. Subsequently, the magma comes into contact with the groundwater surface and produces phreatomagmatic explosions in the subsurface. Understanding the subsurface structure of maar lakes can be...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/86075 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Maar lakes are formed from a series of small-scale eruptions, which occur when
magma rises to the surface. Subsequently, the magma comes into contact with the
groundwater surface and produces phreatomagmatic explosions in the subsurface.
Understanding the subsurface structure of maar lakes can be done, one of which
is through the use of magnetic methods to model the subsurface structure. This
research uses magnetic methods to obtain a subsurface structure model. Before
modelling is done, the magnetic data is corrected first. This correction consists of
diurnal correction and IGRF correction. Then, forward modelling was carried out
with the help of Oasis Montaj software. In this study, the susceptibility value used
has a value range of 0.000166 cm³/g - 0.005940 cm³/g. Modelling was done by
making three passes with a magnetic method error range of 8.905 nT - 13.006 nT.
From the modelling that has been done, the resulting subsurface structure is in
accordance with the geological conditions. Based on these results, the research
location identified a maar lake, which is buried by the rock unit of Careme Young
Volcanic Products. |
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