Analisis Persebaran Volcaniclastic Deposits Gunung Arjuno Berdasarkan Anomali Gravitasi Satelit

Pinandita, Dhaneswara (2021) Analisis Persebaran Volcaniclastic Deposits Gunung Arjuno Berdasarkan Anomali Gravitasi Satelit. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Volcaniclastic deposits adalah rombakan ulang material piroklastik yang kemudian ter-transportasi menuruni badan gunung. Dari hal tersebut, penelitian ini bertujuan untuk mengetahui persebaran, ketebalan dan volume volcaniclastic deposits Gunung Arjuno dengan metode gravitasi satelit yang di validasi data geologi. Untuk mendapatkan tujuan, pertama-tama data gravitasi satelit di tentukan densitas rata-ratanya dengan metode nettleton yang memiliki hasil 1.9838 gr/cm3, hal ini divalidasi survei geologi lapangan dengan tephra sebagai material dominan. Nilai densitas rata-rata digunakan untuk input data pengolahan anomali bouger lengkap (ABL). Setelah ABL didapatkan, dilakukan analisis spektrum yang bertujuan untuk mengetahui kedalaman anomali residual dan regional sehingga bisa dilakukan pemisahan. Kedalaman yang digunakan pada model densitas adalah 300m, melalui trial and error agar model yang didapatkan menampilkan resolusi volcaniclastic deposits yang paling baik. Setelah itu, dilakukan analisis persebaran volcaniclastic deposits dengan mempertimbangkan nilai densitas yang didapat dari model dan divalidasi survei geologi. Model awal densitas memiliki dimensi 6.048 m x 6.529 m x 300 m dengan volume 11,7 km3 , dan rentang densitas 3 gr/cc3 - 1 gr/cc3 karena jenis batuan di lapangan adalah batuan vulkanik. Volcaniclastic deposits memiliki kombinasi proses transportasi mass-flow dan traction yang mengakibatkan tercampurnya fragmen seperti, fragmen lithic andesit basaltik dan fragmen juvenile pumice dengan vesikuler berukuran <1 mm. Karena volcaniclastic deposits didominasi material unconsolidated, maka nilai densitas yang dipilih dari model untuk dibuat volume dan persebaranya adalah 1 gr/cc3-1,5 gr/cc3. Volume volcaniclastic deposits adalah 2,356 km3 terhitung dari 20,136% volume total model, yang persebaranya dibatasi oleh ring-fracture dan mengalir ke arah timur laut melewati celah diantara tubuh tua Gunung Arjuno dan Tubuh Gunung Ringgit. ====================================================================================================== Volcaniclastic deposits are reshuffled pyroclastic materials which are then transported down the mountain body. From this, this study aims to determine the distribution, thickness and volume of volcaniclastic deposits in Mount Arjuno using the satellite gravity method validated by geological data. To get the goal, first of all the satellite gravity data is determined by the average density using the nettleton method which has a result of 1.9838 gr/cm3, this is validated by a field geological survey with tephra as the dominant material. The average density value is used to input data for processing complete Bouger anomaly (ABL). After the ABL is obtained, a spectrum analysis is carried out which aims to determine the depth of the residual and regional anomalies so that separation can be done. The depth used in the density model is 300m, through trial and error so that the obtained model displays the best resolution of volcaniclastic deposits. After that, an analysis of the distribution of volcaniclastic deposits was carried out by considering the density value obtained from the model and validated by the geological survey. The initial density model has dimensions of 6,048 m x 6,529 m x 300 m with a volume of 11.7 km3, and a density range of 3 gr/cc3 - 1 gr/cc3 because the rock type in the field is volcanic rock. Volcaniclastic deposits have a combination of mass-flow transport and traction processes that result in the mixing of fragments such as basaltic andesite lithic fragments and juvenile pumice fragments with vesicular size <1 mm. Because volcaniclastic deposits are dominated by unconsolidated materials, the density value chosen from the model for volume and distribution is 1 gr/cc3-1.5 gr/cc3. The volume of volcaniclastic deposits is 2,356 km3 accounting for 20.136% of the total model volume, whose distribution is limited by the ring-fracture and flows northeastward through the gap between the old body of Mount Arjuno and the Body of Mount Ringgit.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Densitas, Volcaniclastic Deposits, Persebaran, Volumetrik Density, Volcaniclastic Deposits, Distribution, Volumetric
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Q Science > QB Astronomy > QB336 Gravity anomalies
Q Science > QC Physics > QC111 Density and specific gravity
Q Science > QE Geology > QE571 Sedimentation and deposition. Sediment transport. Erosion.
Divisions: Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User: Dhaneswara Pinandita
Date Deposited: 30 Aug 2021 08:59
Last Modified: 30 Aug 2021 08:59
URI: https://repository.its.ac.id/id/eprint/89674

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