IDENTIFICATION OF THE MAGNETIC COERSIVITY SPECTRUM ON THE DIGITIZATION SAMPLE OF THE TENGGER VOLCANIC ASH COMPLEX, EAST JAVA USING PROGRAM MAX UNMIX
Indonesia is known as a volcanic country because Indonesia is located in the Pacific Ring of the fire zone so there are many volcanoes. One of the volcanic areas in Indonesia is the Tengger Volcanic Complex located in East Java. Inside the Tengger Volcanic Complex, there is Mount Bromo and mounta...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/63713 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Indonesia is known as a volcanic country because Indonesia is located in the
Pacific Ring of the fire zone so there are many volcanoes. One of the volcanic
areas in Indonesia is the Tengger Volcanic Complex located in East Java.
Inside the Tengger Volcanic Complex, there is Mount Bromo and mountains or
hills that are no longer active, such as Segarawedi and Widodaren. Volcanic
ash produced from the eruption of the Bromo volcano and the tuff layers in
Segarawedi and Widodaren have rocks that have magnetic properties.
Magnetic minerals are measured to obtain their magnetic properties and also
the coercivity of the rock. One method to get the rock coercivity value is by
unmixing method. The digitization method is useful for literature-based
research if the research sample is not available. The MAX UnMix program was
used in this study to carry out the unmixing process of sample data. Based on
the results of unmixing the Bromo volcanic ash sample and the Segarawedi and
Widodaren tuff samples, the coercivity data for each magnetic component
ranged from 0.81 mT - 202.29 mT. Based on the unmixing results, 3 components
were obtained in each sample of Bromo volcanic ash, Segarawedi tuff sample,
and Widodaren tuff. It is known that component 1 is the component with the
highest coercivity value compared to component 2 and component 3. In
components 2 and 3 there is a big difference between the Bromo volcanic ash
sample and the Segarawedi tuff and Widodaren tuff samples. The results of
unmixing samples of Segarawedi tuff and Widodaren tuff have uniform
coercivity values, while for Bromo volcanic ash samples have various coercivity
values. This was caused by the injection of new magma during the Bromo
eruption in 2010. |
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