Pemodelan 3D Kondisi Bawah Permukaan Berdasarkan Data Gaya Berat Lautan Pasir Tengger

Permana, Raditya Yudha (2020) Pemodelan 3D Kondisi Bawah Permukaan Berdasarkan Data Gaya Berat Lautan Pasir Tengger. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Gunung Bromo terbentuk akibat aktivitas magmatisme pada periode pasca pembentukan Kaldera Lautan pasir yang terbentuk akibat erupsi eksplosif yang terjadi pada Gunung Cemorolawang. Seiring berjalannya waktu, kaldera Lautan pasir terisi dengan endapan abu piroklastik dan pasir, sehingga diperlukan metode geofisika untuk mengetahui kondisi di bawah permukaan. Salah satu metode geofisika yang bagus untuk mengetahui kondisi bawah permukaan adalah metode gaya berat. Metode ini melihat adanya anomali gaya berat akibat adanya kontras densitas batuan di bawah permukaan. Data mentah gaya berat dilakukan proses reduksi dan didapatkan nilai anomali bouguer lengkap. Anomali bouguer kemudian dipisahkan menjadi anomali residual untuk selanjutnya digunakan dalam pemodelan inversi secara 3D. Dari pola anomali Boguer dan hasil pemodelan 3D kemudian dilakukan interpretasi. Berdasarkan pola anomali Bouguer terdapat area dengan nilai anomali tinggi dan rendah. Anomali tinggi berada di sekitar bagian tepi kaldera Lautan pasir diduga merupakan batuan basalt. Sedangkan pola anomali rendah diperkirakan merupakan endapan piroklastik hasil erupsi Gunung Cemoro Lawang yang menutupi hampir keseluruhan area kaldera. Hasil pemodelan inversi 3D metode gaya berat menunjukkan adanya batuan basalt yang terlihat pada bagian tepi area pengukuran atau dalam hal ini kaldera Lautan pasir. Kemudian terdapat aliran lava basal yang muncul ke permukaan pada daerah tenggara area pengukuran. =================================================================================== Mount Bromo was formed due to the activity of magmatism in the post-caldera formation Sea of sand formed by explosive eruptions that occurred on Cemorolawang Mountain. Over time, the Tenger sand sea filled with pyroclastic ash and sand deposits, so that the geophysical method is needed to determine the structure beneath the surface. One of the geophysical method to delineate subsurface structures is the gravity method. This method measures off gravity anomaly due to rock density contrast below the surface. The raw gravity data is carried out in the reduction process and a complete bouguer anomaly value is obtained. The bouguer anomaly is then separated into a residual anomaly for later use in 3D modeling inversion. From Boguer's anomaly pattern and the results of 3D modeling, interpretation is done. Based on the Bouguer anomaly pattern there are areas with high and low anomaly values. High anomaly around the edge of the caldera Sand sea is thought to be basalt rock. While the low anomaly pattern is estimated to be pyroclastic deposits eruption of Mount Cemoro Lawang which covered almost the entire caldera area. The 3D inversion modeling results the gravity method shows the presence of basalt rocks which are visible on the edge of the measurement area or in this case the Tengger sand sea. Then there is a basalt lava flow that appears to the surface in the southeast area of the measurement area.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: gaya berat, kaldera Lautan pasir, pemodelan 3D, SVD, gravity, Tengger sand sea, 3D modelling, SVD
Subjects: T Technology > TN Mining engineering. Metallurgy > TN269 Prospecting--Geophysical methods
Divisions: Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User: Raditya Yudha Permana
Date Deposited: 26 Aug 2020 08:01
Last Modified: 26 Aug 2020 08:01
URI: http://repository.its.ac.id/id/eprint/78757

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