Kusuma, Dionisius Alfa Amori Kusuma (2021) Identifikasi Litologi Penimbun Situs Kumitir dengan Menggunakan Metode Ground Penetrating Radar. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Situs Kumitir merupakan peninggalan yang ditemukan dalam kondisi tertimbun sedalam ±3 meter dan berlokasi tidak jauh dari Pegunungan Arjuno-Welirang. Situs Kumitir berada di wilayah morfologi kipas aluvial yang tersusun oleh batuan piroklastik dan singkapan lapisan abu vulkanik. Hal tersebut membuat situs perlu diteliti lebih lanjut untuk mengetahui litologi perkerasan tanah dasar situs dan batas lapisan yang menimbun situs. Salah satu metode geofisika yang dapat diterapkan adalah metode Ground Penetrating Radar (GPR). Penelitian dilakukan dengan menggunakan metode GPR untuk menjawab dugaan dan faktor yang mempengaruhi penetrasi kedalaman, litologi penimbun serta kelurusan litologi di wilayah Situs Kumitir. Metode GPR mampu mendeteksi suatu litologi melalui konfigurasi gelombang refleksi. Gelombang refleksi dapat menghasilkan pola gelombang elektromagnetik yang berperan dalam melakukan interpretasi litologi. Penelitian dilakukan dengan menggunakan 21 lintasan dengan jarak yang berbeda. Pengolahan data dilakukan dengan melakukan pemodelan 2 dimensi dan 2,5 dimensi. Pengolahan data menghasilkan kedalaman 3 – 5 meter dengan time windows 50 ns dan 6 meter dengan time windows 100 ns. Pengolahan data menghasilkan pola gelombang elektromagnetik dengan jenis pola berlapis, bergelombang, hummocky dan khaotis. Interpretasi data GPR dilakukan bersama dengan data pengikat berupa data bor dan data stratigrafi wilayah. Hasil interpretasi menghasilkan identifikasi litologi dengan kandungan batuan pasir, pasir lempungan maupun campuran pasir – konglomerat sebagai hasil endapan lahar yang menimbun Situs Kumitir. Selain itu, terdapat litologi lanau – lempung yang diidentifikasi sebagai batuan permukaan zaman Kerajaan Majapahit. Berdasarkan litologi tersebut, didapatkan adanya kenaikan litologi dan penipisan endapan lahar dengan arah barat daya – timur laut.
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Kumitir site is a relic that found and buried as deep as ±3 meters and located not far from the Arjuno-Welirang Mountains. The Kumitir site located in the morphology of an alluvial fan, composed of pyroclastic rocks and volcanic ash outcrops. It makes the site need to be investigated further to determine the lithology of the site's ground pavement and the boundary layer that buried the site. One of the geophysical methods that can be applied is the Ground Penetrating Radar (GPR) method. This study was conducted using the GPR method to answer the alleged penetration depth and the factors that influence it, the hoarded lithology and the straightness of the lithology in the Kumitir site. GPR method can detect lithology through a configuration of the reflected wave. Reflection waves can generate electromagnetic wave patterns which play a role in lithology interpretation. The study was conducted using 21 tracks with different distances. Data processing done by data of 2-dimensional model and 2.5-dimensional model. Data processing produces a depth of 3-5 meters with time windows of 50 ns and 6 meters with time windows of 100 ns. Data processing produces electromagnetic wave patterns of layered, wavy, hummocky and chaotic. The interpretation of GPR data is carried out together with supporting data in the form of log data and regional stratigraphy data. The results of the interpretation resulted in the identification of lithology with the sandstone content, clay sand or a mixture of sand – conglomerate as a result of lahar deposits that buried the Kumitir Site. In addition, there is a silt-clay lithology identified as a surface rock during the era of the Majapahit Kingdom. Based on the lithology, it was found that there is an increasing lithology and thinning of lava deposits in the direction of southwest-northeast.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | Ground Penetrating Radar, Lahar, Litologi, Situs Kumitir, Kumitir Site, Lava, Lithology |
| Subjects: | C Auxiliary Sciences of History > CC Archaeology Q Science > QE Geology > QE471 Sedimentary rocks. Sedimentology Q Science > QE Geology > QE538.5 Seismic waves. Elastic waves T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7872 Electromagnetic Devices |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis |
| Depositing User: | Dionisius Alfa Amori Kusuma |
| Date Deposited: | 30 Aug 2021 02:25 |
| Last Modified: | 30 Aug 2021 02:25 |
| URI: | http://repository.its.ac.id/id/eprint/90334 |
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