NURVANINGSIH, DINA (2023) ANALISIS POLA STRUKTUR GEOLOGI DAN KONFIGURASI BAWAH PERMUKAAN CEKUNGAN JAWA TENGAH BAGIAN SELATAN BERDASARKAN METODE GRAVITASI. Other thesis, UPN "Veteran" Yogyajarta.
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Abstract
vi
ABSTRAK
ANALISIS POLA STRUKTUR GEOLOGI DAN KONFIGURASI BAWAH
PERMUKAAN CEKUNGAN JAWA TENGAH BAGIAN SELATAN
BERDASARKAN METODE GRAVITASI
Oleh:
Dina Nurvaningsih
115.190.022
Indonesia terletak di daerah konvergensi antara Lempeng Pasifik yang bergerak ke
barat, Lempeng Hindia-Australia yang bergerak ke utara dan Lempeng Eurasia yang
bergerak ke selatan mengakibatkan peningkatan zona seismisitas, bergesernya jalur
tumbukan dan mengaktifkan gunungapi yang mempengaruhi pembentukan struktur
regional, serta pembentukan cekungan sedimen. Indonesia memiliki 128 cekungan sedimen
dimana 54 cekungan sudah dilakukan eksplorasi dan sisanya belum di eksplorasi salah
satunya yaitu cekungan yang ada di Jawa Tengah bagian selatan. Penelitian ini difokuskan
untuk mengetahui pola struktur dan konfigurasi bawah permukaan di cekungan Jawa
Tengah bagian selatan menggunakan metode Gravitasi. Penelitian dilakukan di daerah
Jawa Tengah bagian selatan meliputi daerah Kebumen, Karangsambung, Kulonprogo,
Yogyakarta, dan Bayat dengan luasan 45 x 160 km2 menggunakan data hasil digitasi peta
Anomali Bouguer Lengkap. Proses digitasi dilakukan dengan cara menggambar kembali
peta Anomali Bouguer Lengkap sehingga didapatkan data berupa koordinat X dan Y, serta
nilai Anomali Bouguer Lengkap. Data Anomali Bouguer Lengkap dilakukan pemisahan
anomali menggunakan Bandpass filter karena dapat meloloskan rentang frekuensi tertentu
sesuai dengan kebutuhan. Kemudian untuk memperkuat batas anomali, dilakukan analisis
derivative yaitu Total Horizontal Derivative, Tilt Derivative, dan Second Vertical
Derivative. Selanjutnya dilakukan pemodelan 2,5 dimensi dengan data kedalaman
berdasarkan perhitungan analisis spektrum. Berdasarkan hasil penelitian, didapatkan nilai
Anomali Bouguer Lengkap pada daerah penelitian dengan rentang 389,0 mGal sampai
1232,3 mGal sedangkan nilai anomali regional sebesar -233,8 mGal sampai 217,1 mGal.
Pada anomali regional diindikasikan terdapat adanya 9 sesar dengan arah relatif baratdaya-
tenggara dan baratlaut-tenggara di daerah penelitian, hal tersebut juga didukung dengan
respon yang muncul pada analisis derivative. Dari hasil pemodelan 2,5D didapatkan
informasi bahwa terdapat tiga cekungan pada daerah penelitian yaitu cekungan di
Wonosari-Bayat, cekungan di Yogyakarta, dan cekungan di Kebumen yang di alasi oleh
batuan Pra-Tersier dan diisi oleh sedimen Tersier dengan masing-masing kedalaman 4,6
km, 5,5 km, dan 6 km.
Kata kunci : Cekungan, Gravitasi, Jawa Tengah Selatan, Struktur
vii
ABSTRACT
ANALYSIS OF GEOLOGICAL STRUCTURAL PATTERNS AND
SUBSURFACE CONFIGURATIONS OF THE SOUTHERN PART OF THE
CENTRAL JAVA BASIN BASED ON THE GRAVITY METHOD
Dina Nurvaningsih
115.190.022
Indonesia is located in the convergence area between the westward-moving Pacific
Plate, northward-moving Indian-Australian Plate and southward-moving Eurasian Plate
resulting high seismicity zone, shifting collision paths and active volcanic, which also
affects the formation of regional structures, as well as the formation of sedimentary basins.
Indonesia has 128 sedimentary basins, where 54 basins have been explored and vice versa
for the others, actually one of the pure basin is located at Central Java. Then this research
is focused on knowing the pattern of subsurface structure and configuration in the southern
Central Java basin using the Gravity method. The research is conducted in the southern part
of Central Java including Kebumen, Karangsambung, Kulonprogo, Yogyakarta, and Bayat
with an area of 45 x 160 km2 using data from the Complete Bouguer Anomaly map
digitization. The digitization process is carried out by redrawing the Complete Bouguer
Anomaly map to obtain data in the form of X and Y coordinates, and ABL values. Complete
Anomaly Bouguer data is separated using a Bandpass filter because it can pass frequency
ranges according to the needs. Then to strengthen the boundary of the anomaly, derivative
analysis is carried out, namely Total Horizontal Derivative, Tilt Derivative, and Second
Vertical Derivative. Furthermore, 2.5-dimensional modeling is carried out with depth data
based on spectrum analysis calculations. Based on the results of the study, the Complete
Bouguer Anomaly value in the research area is obtained in the range from 389.0 mGal to
1232.3 mGal while the regional anomaly value is between -233.8 and 217.1 mGal. The
regional anomaly indicates the presence of 9 faults with a relative direction of southwest-
southeast and northwest-southeast in the study area, this is also supported by the response
that appears in the derivative analysis. From the results of 2.5D modeling, it is found that
there are three basins in the research area, namely the Wonosari-Bayat basin, the
Yogyakarta basin, and the Kebumen basin, which are underlain by Pre-Tertiary rocks and
filled by Tertiary sediments with depths of 4.6 km, 5.5 km, and 6 km respectively.
Keywords : Basin, Fault, Gravity, South Central Java, Structure
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Basin, Fault, Gravity, South Central Java, Structure |
| Subjects: | Q Science > QE Geology |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Geography |
| Depositing User: | Eko Yuli |
| Date Deposited: | 04 Oct 2023 08:02 |
| Last Modified: | 04 Oct 2023 08:02 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/37812 |
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