NUGROHO, MUHAMMAD ABDULLAH (2024) PENDUGAAN BATUAN DASAR SITUS LIYANGAN MENGGUNAKAN METODE RESISTIVITAS PADA DAERAH DUSUN LIYANGAN, DESA PURBASARI, NGADIREJO, TEMANGGUNG, JAWA TENGAH. Other thesis, UPN Veteran Yogyajarta.
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Abstract
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ABSTRAK
PENDUGAAN BATUAN DASAR SITUS LIYANGAN
MENGGUNAKAN METODE RESISTIVITAS PADA DAERAH
DUSUN LIYANGAN, DESA PURBASARI, NGADIREJO,
TEMANGGUNG, JAWA TENGAH
Muhammad Abdullah Nugroho
115.190.023
Situs Liyangan berada pada lereng bawah Gunung Sindoro yang secara
administratif berada di Desa Purbasari, Kecamatan Ngadirejo, Kabupaten Temanggung,
Jawa Tengah. Secara geologis, Situs Liyangan berada pada Fasies Medial Sindoro
didominasi oleh endapan klastika gunungapi seperti endapan aliran piroklastik dan endapan
jatuhan piroklastik sehingga aktivitas vulkanik sangat mempengaruhi perubahan bentuk
hingga terkuburnya situs seperti saat ini. Oleh karena itu, dilakukan analisis dengan metode
geolistrik untuk menggambarkan kondisi bawah permukaan sebagai upaya pemeliharaan
bangunan bersejarah yang erat kaitannya dengan masa Mataram Hindu.
Penelitian ini menggunakan 9 lintasan geolistrik mapping konfigurasi dipole-
dipole yang terdiri atas 4 lintasan berarah timur laut – barat daya dan 5 lintasan berarah
tenggara – barat laut dengan panjang lintasan bervariasi 100 m, 120 m, 200 m, 240 m
dengan spasi elektroda 10 m dan beberapa di antaranya 5 m. Waktu pengambilan data
dilakukan selama 3 hari pada tanggal 16 - 18 Juni 2022 dengan instrumen Ambrogeo
Mangusta System Multichannel. Pendugaan batuan dasar Situs Liyangan ini dilakukan
berdasarkan analisis sebaran nilai resistivitas melalui interpretasi penampang 2D, korelasi
seluruh lintasan, dan pemodelan 3D resistivitas terhadap kedalaman.
Hasil penelitian menunjukkan nilai resistivitas berkisar antara 93,9 Ω.m - 12.019
Ω.m yang secara umum terdiri atas material vulkanik G. Sindoro yang diinterpretasikan ke
dalam 3 lapisan yakni pasir, breksi laharik pada nilai resistivitas 93,9 Ω.m – 751 Ω.m di
kedalaman 0,8 – 8,5 m, lapisan litologi breksi vulkanik pada nilai resistivitas 751 Ω.m –
3.005 Ω.m di kedalaman 4,3 – 13,5 m, dan lava andesit pada nilai resistivitas 3.005 Ω.m –
12.019 Ω.m di kedalaman 8,5 – 19,6 m. Adapun dugaan batuan dasar situs berada pada
kedalaman 0,8 hingga 8,5 m dengan rentang nilai resistivitas 3.005 Ω.m – 6.010 Ω.m yang
diduga merupakan batuan andesit yang erat kaitannya dengan sistem pemujaan dan
pertanian sebagai pondasi talud dan teras lahan.
Kata Kunci: dipole-dipole, resistivitas, Gunung Sindoro, Situs Liyangan
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ABSTRACT
ESTIMATION OF BEDROCK OF LIYANGAN SITE USING
RESISTIVITY METHOD IN THE AREA OF LIYANGAN,
PURBASARI VILLAGE, NGADIREJO, TEMANGGUNG,
CENTRAL JAVA
Muhammad Abdullah Nugroho
115.190.023
The Liyangan site is located on the lower slopes of Mount Sindoro which is
administratively located in Purbasari Village, Ngadirejo District, Temanggung
Regency, Central Java. Geologically, the Liyangan Site is in the Sindoro Medial
Facies dominated by volcanic clastic deposits such as pyroclastic flow deposits and
pyroclastic fall deposits so that volcanic activity greatly affects the shape change
until the site is buried as it is today. Therefore, geoelectric analysis was conducted
to describe the subsurface conditions as an effort to maintain historical buildings
that are closely related to the Hindu Mataram period.
This study used 9 geoelectric mapping with dipole-dipole configuration
consisting of 4 in northeast - southwest direction and 5 in southeast - northwest
direction with varying line lengths of 100 m, 120 m, 200 m, 240 m with electrode
spacing of 10 m and some of them are 5 m. Data collection time was carried out for
3 days on June 16-18, 2022 with the Ambrogeo Mangusta System Multichannel
instrument. The estimation of the bedrock of the Liyangan Site was carried out
based on the analysis of distribution of resistivity values through 2D cross-section
interpretation, correlation of all lines, and 3D modeling of resistivity to depth.
The results showed resistivity values ranging from 93.9 Ω.m - 12,019 Ω.m
which generally consists of volcanic material of Mount Sindoro which is interpreted
into 3 layers namely sand, laharic breccia at a resistivity value of 93.9 Ohm. m -
751 Ω.m at a depth of 0.8 - 8.5 m, volcanic breccia lithology layer at a resistivity
value of 751 Ω.m - 3,005 Ω.m at a depth of 4.3 - 13.5 m, and andesite lava at a
resistivity value of 3,005 Ω.m - 12,019 Ω.m at a depth of 8.5 - 19.6m. The suspected
bedrock of the site is at a depth of 0.8 to 8.5 m with a resistivity value range of
3,005 Ω.m - 6,010 Ω.m which is thought to be an andesite rock that is closely related
to the cult and agricultural system as the base of the talud and terrace land.
Keywords: dipole-dipole, resistivity, Mount Sindoro, Liyangan Site
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | dipole-dipole, resistivity, Mount Sindoro, Liyangan Site |
| Subjects: | Q Science > QE Geology |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | Eko Yuli |
| Date Deposited: | 10 Jan 2024 02:58 |
| Last Modified: | 10 Jan 2024 02:58 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/38618 |
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