Pemodelan Struktur Bawah Permukaan Gunung Buring, Malang, Jawa Timur Menggunakan Metode Gaya Berat

Rahmatillah, Hilda Uns. (2026) Pemodelan Struktur Bawah Permukaan Gunung Buring, Malang, Jawa Timur Menggunakan Metode Gaya Berat. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Daerah Buring di Malang, Jawa Timur merupakan salah satu morfologi vulkanik yang sebelumnya diinterpretasikan sebagai pusat atau bekas kawah vulkanik berdasarkan karakteristik morfologi permukaannya. Namun, hingga saat ini informasi mengenai struktur bawah permukaan wilayah tersebut masih terbatas sehingga mekanisme pembentukannya belum dapat dipahami secara menyeluruh. Penelitian ini bertujuan memodelkan struktur bawah permukaan Buring menggunakan metode gaya berat melalui pemodelan 2,5D dan inversi 3D untuk mengevaluasi karakter geologi yang mendasari morfologi tersebut. Data gaya berat diperoleh dari 100 titik pengukuran yang terdiri atas dua lintasan saling berpotongan dan beberapa titik grid. Pemrosesan data meliputi koreksi gaya berat untuk memperoleh nilai anomali yang representatif, penentuan densitas reduksi menggunakan pendekatan Nettleton, perhitungan Complete Bouguer Anomaly (CBA), pemisahan anomali regional-residual untuk mengidentifikasi anomali lokal, serta pemodelan 2,5D dan 3D guna menginterpretasikan geometri struktur bawah permukaan. Model 2,5D dan 3D mengindikasikan keberadaan tubuh intrusi dangkal dengan geometri menyerupai inclined sill. Berdasarkan karakteristik geometri, distribusi densitas, serta keterkaitannya dengan morfologi permukaan, hasil penelitian mengindikasikan bahwa morfologi Buring lebih sesuai diinterpretasikan sebagai morfologi berkubah (dome) yang terbentuk akibat intrusi magma dangkal dibandingkan sebagai tubuh gunung api sebagaimana interpretasi sebelumnya.
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Buring in Malang, East Java, is a volcanic landform that was previously interpreted as a volcanic center or former crater based on its surface morphological characteristics. However, information regarding the subsurface structure of this area remains limited, so the mechanism of its formation has not yet been fully understood. This study aims to model the subsurface structure of Buring using gravity methods through 2.5D modeling and 3D inversion to evaluate the geological characteristics underlying this morphology. Gravity data were obtained from 100 measurement points consisting of two intersecting transects and several grid points. Data processing included gravity correction to obtain representative anomaly values, determination of reduced density using the Nettleton approach, calculation of the Complete Bouguer Anomaly (CBA), separation of regional and residual anomalies to identify local anomalies, as well as 2.5D and 3D modeling to interpret the geometry of the subsurface structure. The 2.5D and 3D models indicate the presence of a shallow intrusive body with a geometry resembling an inclined sill. Based on geometric characteristics, density distribution, and their relationship to surface morphology, the research results indicate that the Buring morphology is better interpreted as a dome formed by a shallow magma intrusion rather than as a volcanic body, as previously interpreted.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Buring, Gaya Berat, Pemodelan 2,5D-3D, Buring, Gravity, 2,5D-3D Modeling
Subjects:	Q Science > QB Astronomy > QB336 Gravity anomalies Q Science > QC Physics > QC111 Density and specific gravity Q Science > QE Geology > QE601 Geology, Structural
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User:	Hilda Uns. Rahmatillah
Date Deposited:	24 Jul 2026 04:03
Last Modified:	24 Jul 2026 04:03
URI:	http://repository.its.ac.id/id/eprint/136800

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