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All Journal IJOG : Indonesian Journal on Geoscience Jurnal AKAL: Abdimas dan Kearifan Lokal Petro : Jurnal Ilmiah Teknik Perminyakan Journal of Geoscience Engineering and Energy (JOGEE) JURNAL ABDI MASYARAKAT INDONESIA (JAMIN) Jurnal Eksakta Kebumian Scientific Contribution Oil and Gas
Imam Setiaji Ronoatmojo
Program Studi Teknik Geologi, Fakultas Teknologi Kebumian Dan Energi, Universitas Trisakti
Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Physics Public Health Social Sciences Transportation Other

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Journal : Journal of Geoscience Engineering and Energy (JOGEE)

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ANALISIS KESTABILAN LERENG BERDASARKAN METODE ROCK MASS RATING PADA PT. INDOCEMENT TUNGGAL PRAKARSA Tbk, KABUPATEN BOGOR, PROVINSI JAWA BARAT: ANALYSIS OF SLOPE STABILITY BASED ON THE ROCK MASS RATING METHOD AT PT. INDOCEMENT TUNGGAL PRAKARSA Tbk, BOGOR DISTRICT, WEST JAVA PROVINCE Hadi Taqiuddin, Akrom; Ronoatmojo, Imam Setiaji
Journal of Geoscience Engineering and Energy VOLUME 5, NOMOR 1, FEBRUARI 2024
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/jogee.v5i1.18941

Abstract

Weathering and the geological structure of the area affect slope stability. PT. Indocement Tunggal Prakarsa Tbk, Citeureup District, Bogor Regency, West Java Province, is the subject of this research. By calculating the safety factor value based on the Rock Mass Rating (RMR) using the Spencer method using Rocscience Slide 6.0 software, researchers hope to ensure slope stability. In fact, based on the slope stability analysis, it has a safety factor value of 0.900, so it is not in accordance with the Minister of Energy and Mineral Resources regulation 1827/K/30/MEM/2018. Based on this, recommendations for slope analysis of the research area have been made with a safety factor value of 1.232 in accordance with applicable regulations.
ANALISIS BALIK LERENG LOWWALL PADA “BLOK X” KABUPATEN TANAH BUMBU, PROVINSI KALIMANTAN SELATAN: BACK ANALYSIS OF LOWWALL SLOPES IN "BLOCK X" DISTRICT TANAH BUMBU, SOUTH KALIMANTAN PROVINCE Putri, Al Zahra; Imam Setiaji Ronoatmojo; Wijaya, Budi
Journal of Geoscience Engineering and Energy VOLUME 5, NOMOR 1, FEBRUARI 2024
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/jogee.v5i1.19236

Abstract

Coal mining companies usually apply the open pit mining method in carrying out coal mining. Mining activities always have risks that cannot be avoided and unpredictable, one of which is a landslide in the mining area. Therefore, it is very necessary to control the risks of mining activities. One of them is like designing a slope design in the mine which is included in geotechnical aspects. And in the geotechnical aspect, it has a reverse analysis method that is very useful to determine the cause of avalanches in the area.
HUBUNGAN KEKUATAN LAPIS TANAH DASAR DENGAN METODE CBR TERHADAP INDEKS PLASTISITAS TANAH DAERAH SITU GADUNG KECAMATAN PAGEDANGAN KABUPATEN TANGERANG: RELATIONSHIP OF SUBGRADE SOILS USING CBR METHOD TOSOIL PLASTICITY INDEX IN SITU GADUNG AREAPAGEDANGAN TANGERANG DISTRICT Novela, Adita; Ronoatmojo, Imam Setiaji; Yuda, Himmes Fitra
Journal of Geoscience Engineering and Energy (JOGEE) VOLUME 5, NOMOR 2, AGUSTUS 2024
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/azgtmr80

Abstract

Tanah yang sering mengalami masalah dalam pembangunan konstruksi geologi rekayasa adalah tanah lempung. Kerusakan jalan yang selama ini sering dijumpai dikarenakan tidak tersedianya data California Bearing Ratio (CBR) serta konsistensi tanah. Tujuan dari penelitian ini adalah, mengetahui nilai CBR dengan alat DCP, meninjai evaluasi kekuatan lapis tanah dasar, menentukan batas konsistensi tanah, dan menginterpretasikan korelasi berdasarkan data CBR dan Plasticity Index (PI). Metode penelitian dilakukan dengan CBR dengan alat DCP, pengambilan sampel tanah, serta pengukuran indeks plastisitas tanah langsung. Pada daerah penelitian ini diketahui memiliki tingkat konsistensi plastisitas tanah yang tinggi, kohesi, dan tanah lempung dengan nilai PL sebesar 28,85% - 48%. Kemudian didapat nilai indeks plastisitas (PI) daerah penelitian yang memiliki nilai 25,15%-36,82%. Maka hasil PI ini mempunyai tingkat indeks plastis yang tinggi, tanah yang kohesif serta tipe tanah atau jenis yang lempung sehingga buruk untuk konstruksi di atasnya karena potensi swelling lempung. Kemudian untuk data CBR daerah penelitian didapat sebesar 5,05-5,55% dengan soil type lempung termasuk zona yang buruk/rendah.  The soil that often experiences problems in the construction of engineering geological construction is clay soil. Road damage that has often been encountered is due to the unavailability of California Bearing Ratio (CBR) data and soil consistency. The purpose of this research is to determine the CBR value using the DCP tool, review the evaluation of the strength of the subgrade layer, determine the soil consistency limit, and interpret correlation based on CBR and Plasticity Index data. The research method was carried out using CBR with a DCP tool, taking soil samples, and directly measuring the soil plasticity index. This research area is known to have a high level of consistent soil plasticity, cohesion, and clay soil with a PL value of 28,85% - 48%. Then the plasticity index (PI) value for the research area was obtained which had a value of 25,15% -36.82%. Therefor this plasticity index has high plasticity, cohesive properties and a clay type of soil so it is bad for construction on it because of the potential for clay swelling. Then the CBR data for the research area was found to be 5.05-5.55% with a clay soil type including poor/low zones.
PENGARUH BEBAN GEMPA BERDASARKAN PUSGEN 2017 DAN STANDAR NASIONAL INDONESIA DI TEBING CITATAH 125: EFFECT OF EARTHQUAKE LOADS BASED ON PUSGEN 2017 AND INDONESIAN NATIONAL STANDARDS ON CITATAH 125 CLIFFS Ardikasa, Gentala; Ronoatmojo, Imam Setiaji
Journal of Geoscience Engineering and Energy (JOGEE) VOLUME 5, NOMOR 2, AGUSTUS 2024
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/w4bam255

Abstract

Tebing Citatah merupakan suatu kawasan wisata dan olahraga panjat tebing yang berada di kawasan Kabupaten Bandung Barat, Tebing Citatah terletak di Pamucatan dan disekitarnya terdapat sesar Cimandiri yang terbentang dengan arah NE-SW dari Padalarang ke Pelabuhan Ratu sepanjang 100 km. Karena didapatkan daerah penelitian yang berada di sekitar segmen sesar Cimandiri, maka perlu dilakukan analisis pengaruh beban gempa yang dikorelasikan terhadap Standar Nasional Indonesia (SNI) untuk ketentuan nilai Peak Ground Acceleration (PGA) dan selanjutnya akan diambil nilai PGA dari ketentuan PUSGEN 2017. Analisis lereng menggunakan metode Bishop dengan kriteria Generalized Hoek-Brown dan Mohr-Couloumb, dimana material properties kriteria Generalized Hoek-Brown terdapat Uniaxial Compressive Strength (UCS), Geological Strength Index (GSI), nilai konstanta mi, dan Disturbance Factor (D) yang cocok digunakan untuk lereng yang berupa batuan, sedangkan material properties untuk kriteria Mohr-Couloumb berisi kohesi dan sudut geser dalam yang cocok digunakan untuk lereng yang berupa tanah seperti material timbunan. Nilai FK yang didapatkan pada kondisi tanpa beban gempa sebesar 5,513 yang dikategorikan aman berdasarkan SNI8460:2017, sedangkan pada kondisi setengah beban gempa FK didapatkan sebesar 4,010 yang dikategorikan aman, dan untuk kondisi beban gempa penuh didapatkan FK sebesar 3,153 yang dikategorikan aman. Citatah Cliff is a tourist and sports rock climbing area located in the West Bandung Regency area. Citatah Cliff is located in Pamucatan and around it there is the Cimandiri fault which stretches in a NE-SW direction from Padalarang to Pelabuhan Ratu for 100 km. Because the research area was found to be around the Cimandiri fault segment, it is necessary to analyze the influence of earthquake loads which are correlated with the Indonesian National Standard (SNI) for the Peak Ground Acceleration (PGA) value provisions and then the PGA value will be taken from the 2017 PUSGEN provisions. Slope analysis using the Bishop method with Generalized Hoek-Brown and Mohr-Couloumb criteria, where the material properties of the Generalized Hoek-Brown criteria include Uniaxial Compressive Strength (UCS), Geological Strength Index (GSI), mi constant value, and Disturbance Factor (D) which are suitable for use for rock slopes, while the material properties for the Mohr-Coulomb criteria contain cohesion and internal shear angles which are suitable for use on soil slopes such as embankment material. The FK value obtained in conditions without earthquake load was 5,513 which was categorized as safe based on SNI8460:2017, while in half earthquake load conditions the FK was obtained at 4,010 which was categorized as safe, and for full earthquake load conditions the FK was obtained at 3,153 which was categorized as safe.
ANALISIS KESTABILAN LERENG TAMBANG DENGAN ASPEK PEMODELAN AIR TANAH  PADA PIT X, PT JHONLIN BARATAMA, DESA SERONGGA,KABUPATEN TANAH BUMBU, PROVINSI KALIMANTAN SELATAN: MINE SLOPE STABILITY ANALYSIS WITH GROUNDWATER MODELINGASPECTS IN PIT X, PT JHONLIN BARATAMA, SERONGGA VILLAGE,TANAH BUMBU DISTRICT, SOUTH KALIMANTAN PROVINCE Sinulingga, Asya Sridah; Ronoatmojo, Imam Setiaji
Journal of Geoscience Engineering and Energy (JOGEE) VOLUME 5, NOMOR 2, AGUSTUS 2024
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/sn9w0p22

Abstract

Air tanah yang mengisi ruang pori pada batuan atau tanah pada tubuh lereng dapat menyebabkan terjadinya pengurangan kuat geser batuan. Lokasi penelitian termasuk dalam wilayah Cekungan Barito. Data primer berupa data elevasi muka air tanah dan konduktivitas hidrolik material timbunan. Perhitungan repose angle berdasarkan perhitungan pada perubahan elevasi menggunakan hukum trigono metri. Pengolahan data menggunakan bantuan software Geostudio 2022 analisis SEEP/W untuk pemodelan air tanah dan SLOPE/W untuk analisis kestabilan lereng. Nilai konduktivitas hidrolik diketahui melalui metode lapangan slug test. Hasil slug test menunjukkan bahwa konduktivitas hidrolik pada material timbunan sebesar 4,2052 × 10-6 m/s. Hasil analisis kestabilan lereng berupa nilai Faktor Keamanan menunjukkan bahwa kondisi air tanah pada lereng timbunan daerah penelitian mendekati jenuh. Groundwater that fills pore spaces in rocks or soil on slopes can cause a reduction in the shear strength of rocks. The research location is included in the Barito Basin area. Primary data consists of data on groundwater level elevation and hydraulic conductivity of embankment material. Repose angle calculations are based on calculations of elevation changes using the laws of trigonometry. Data processing uses Geostudio 2022 software, SEEP/W analysis for groundwater modeling and SLOPE/W for slope stability analysis. The hydraulic conductivity value is determined through the field slug test method. The slug test results show that the hydraulic conductivity of the embankment material is 4.2052 × 10-6 m/s. The results of the slope stability analysis in the form of Safety Factor values ​​show that the groundwater conditions on the embankment slopes in the research area are approaching saturation. 
GROUTING MERUPAKAN CARA PERBAIKAN YANG TEPAT PADA DASAR PONDASI RIVERBED BENDUNGAN SADAWARNA, SUBANG, JAWA BARAT: GROUTING IS THE RIGHT WAY TO REPAIR THE RIVERBED FOUNDATION OF THE SADAWARNA DAM, SUBANG, WEST JAVA Rachmayanti, Zarah; Ronoatmojo, Imam Setiaji; Fitra Yuda, Himmes
Journal of Geoscience Engineering and Energy VOLUME 6, NOMOR 1, FEBRUARI 2025
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/jogee.v6i1.22157

Abstract

Dibangunan Bendungan, terdapat beberapa konstruksi yaitu main dam, riverbed, spillway, saddle dam dan masih banyak lagi. Dibagian riverbed yaitu fondasi bagian dari sungai atau aliran air yang tertahan di belakang bendungan. Dasar sungai juga berfungsi untuk menyalurkan air ketika air mengalir melalui spillway atau saluran pelepasan. Hal tersebut guna memenuhi persyaratan yang mengacu pada pedoman keamanan bendungan dari Kementerian PUPR. Evaluasi geologi teknik yang rinci perlu diberikan pada kondisi dasar fondasi, khususnya pada struktur saddle dam. Grouting menjadi salah satu teknik yang digunakan untuk memperbaiki dan meningkatkan efisiensi dasar fondasi guna memastikan keamanan dan stabilitas bangunan. Maka dari itu, fondasi bendungan wajib kedap air untuk mencegah rembesan atau kebocoran. Salah satu cara untuk mem perbaiki kerusakan yang disebabkan oleh deformasi struktur tanah atau batuan adalah dengan melakukan perbaikan fondasi dengan grouting. Pada umumnya kondisi tanah/batuan yang memiliki bidang diskontinuitas di bawah permukaan akibat kekar. Kondisi demikian akan menyebabkan nilai permeabilitas pada tanah /batuan tersebut menjadi tinggi. Hal ini akan menimbulkan kebocoran yang dapat mengakibatkan terjadinya kerusakan bendungan. Perbaikan yang perlu dilakukan  adalah dengan mengurangi rembesan air sehingga angka koefisien permeabilitas nya (nilai Lugeon) menjadi kecil. Untuk perbaikan fondasi tersebut dapat ditangani dengan menggunakan teknik injeksi semen (grouting) yang dilakukan pada bagian paling buruk kelas batuannya dan paling tinggi angka koefisien permeabilitasnya (nilai lugeon). In the dam building, there are several constructions, including main dam, riverbed, spillway, saddle dam and others. The riverbed section is the foundation of the part of the river or water flow that is blocked behind the dam. The riverbed also functions to channel water when the water flows through a spillway or release channel. This is to fulfill the requirements that refer to the dam safety guidelines from the Ministry of PUPR. A detailed engineering geological evaluation needs to be given to the basic condition of the foundation, especially the saddle dam structure. Grouting is one of the techniques used to repair and increase the efficiency of the foundation base to ensure the safety and stability of the dam. Therefore, the dam foundation must be watertight to prevent seepage or leaks. One way to repair damage caused by deformation of soil or rock structures is to repair the foundation with grouting. In general, soil/rock conditions have areas of discontinuity below the surface due to joints. Such conditions will cause the permeability value of the soil/rock to be high. This will cause leaks which can result in dam damage. Improvements that need to be made are to reduce water seepage so that the permeability coefficient (Lugeon value) becomes small. Foundation repairs can be handled using cement injection techniques (grouting) which are carried out on the parts with the worst rock class and the highest permeability coefficient (lugeon value).
STUDI PERBANDINGAN KESTABILAN LERENG DENGAN VARIASI KEMIRINGAN LERENG PADA LAPANGAN “X” DAERAH LAHAT, SUMATRA SELATAN: COMPARATIVE STUDY OF SLOPE STABILITY WITH SLOPE VARIATIONS IN FIELD “X” LAHAT, SOUTH SUMATRA Koro, Margaretha Inggrid Wuno; Ronoatmojo, Imam Setiaji
Journal of Geoscience Engineering and Energy VOLUME 6, NOMOR 1, FEBRUARI 2025
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/jogee.v6i1.22244

Abstract

PT Berkah Daya Sukses merupakan salah satu perusahaan tambang batubara yang berada di Kabupaten Lahat, Sumatra Selatan. Analisis kestabilan lereng ini penting dilakukan di daerah pertambangan karena berkaitan dengan pendapatan dan juga keselamatan dari pekerja yang berada di kawasan tersebut. Dilakukan perhitungan Faktor Keamanan dengan menggunakan software Slide 6.0 dengan membuat dua pemodelan antara litologi yang sudah terkena deformasi atau memiliki dip (real di lapangan) dan litologi yang belum terkena deformasi (asumsi) dengan lima kemiringan yang berbeda  mulai dari kemiringan 55o, kemiringan 50o, kemiringan 45o, kemiringan 40o, dan kemiringan 35o untuk mengetahui pengaruh dip terhadap kestabilan lereng. Diperoleh hasil faktor keamanan untuk litologi yang memiliki dip yaitu 0,902; 0,989; 1,116; 1,204; dan 1,298 dan untuk litologi datar yaitu 1,022; 1,157; 1,221; 1,273; dan 1,315. Dari perhitungan yang telah dilakukan menunjukkan bahwa kemiringan litologi ini cukup berpengaruh terhadap kestabilan lereng pada daerah penelitian hal ini ditunjukkan dengan angka faktor keamanan pada litologi datar lebih stabil daripada litologi dengan dip hal ini disebabkan oleh lereng yang litologinya mempunyai dip menghasilkan intensitas rembesan yang lebih banyak dibandingkan dengan lereng yang tidak memiliki dip (litologi datar). Berbedanya intensitas rembesan pada dua pemodelan ini karena pada litologi dengan dip adanya kontak antar pada setiap lapisan yang dapat menjadi jalan keluarnya air sedangkan pada litologi datar air cenderung menyebar lebih merata dan terarah sehingga kemungkinan untuk terjadi rembesan lebih sedikit. Rembesan yang terjadi ini akan meningkatkan tekanan pori serta mempengaruhi gaya geser sehingga kestabilan lereng pada litologi dengan dip lebih tidak stabil. PT Berkah Daya Sukses is one of the coal mining companies located in Lahat Regency, South Sumatra. This slope stability analysis is important to carry out in mining areas because it is related to income and also the safety of workers in the area. The calculation of the Safety Factor was carried out using Slide 6.0 software by making two models between lithology that has been affected by deformation or has a dip (real in the field) and lithology that has not been affected by deformation (assumption) with five different slopes starting from slope 55o, slope 50o, slope 45o, slope 40o and slope 35o to determine the effect of dip on slope stability. The results of the safety factor for lithology that have a dip of 0.902 were obtained; 0,989; 1,116; 1,204; and 1,298 and for flat lithology, which is 1,022; 1,157; 1,221; 1,273; and 1,315. From the calculations that have been carried out, it is shown that the slope of this lithology is quite influential on the stability of the slope in the study area, this is shown by the number of safety factors in flat lithology is more stable than lithology with dip, this is due to slopes whose lithology has dip, resulting in more seepage intensity compared to slopes that do not have dip (flat lithology). The difference in seepage intensity in these two modeling is because in lithology with dip there is contact between each layer which can be the outlet of water, while in flat lithology water tends to spread more evenly and directionally so that there is less possibility of seepage. This seepage will increase the pore pressure and affect the shear force so that the slope stability in lithology with dips is more unstable.
MENENTUKAN NILAI KELAS BATUAN BERDASARKAN STRUKTUR KEKAR SEBAGAI DASAR EVALUASI GEOLOGI TEKNIK PADA PONDASI SADDLE DAM BENDUNGAN SADAWARNA: DETERMINING ROCK CLASS VALUES BASED ON FRACTURE STRUCTURE AS A BASIS FOR ENGINEERING GEOLOGY EVALUATION ON THE SADDLE DAM FOUNDATION OF THE SADAWARNA DAM Akmalia Putri, Deyana; Ronoatmojo, Imam Setiaji; Pramudito, Harry
Journal of Geoscience Engineering and Energy VOLUME 6, NOMOR 2, AGUSTUS 2025
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/

Abstract

Bendungan Sadawarna yang berlokasi di Desa Sadawarna akan dilakukan analisis kestabilan batuan dasar sebagai penopang tapak dan tubuh bendungan. Selain itu, penelitian mendalam juga diperlukan untuk menganalisis kestabilan tanah akibat rembesan air guna memastikan tingkat keamanan bendungan. Analisis geoteknik dilakukan dengan memperhitungkan nilai Rock Quality Designation, yang kemudian dikorelasikan antara titik-titik bor untuk memberikan gambaran jenis batuan di bawah permukaan. Jenis batuan sangat dipengaruhi oleh struktur rekahan, karena kerapatan rekahan akan tercermin dalam nilai RQD. Hasil evaluasi geoteknik menunjukkan bahwa tanah dasar bendungan pelana didominasi oleh batuan dengan kelas CM hingga CL. Sementara itu, batulempung hitam memiliki kelas batuan D, sehingga perlu dikupas dan dilakukan perbaikan dengan beton gigi bermutu K 175. Sadawarna Dam is located in Sadawarna Village. An analysis of the stability of the bedrock as support for the site and body of the dam will be carried out. Apart from that, in-depth research is also needed to analyze the stability of the soil due to water seepage to ensure the safety level of the dam. Geotechnical analysis is carried out by calculating the Rock Quality Designation value, which is then correlated between drill points to provide an overview of the rock types below the surface. The type of rock is greatly influenced by the fracture structure, because the fracture density will be reflected in the RQD value. The results of the geotechnical evaluation show that the base soil of the saddle dam is dominated by rocks with classes CM to CL. Meanwhile, black mudstone has rock class D, so it needs to be peeled and repaired with K 175 quality dental concrete.
Co-Authors Abdul Hamid Abdurrachman Asseggaf Akmalia Putri, Deyana Andry Prima Andy Livsey Ardikasa, Gentala Arkhandiaz Shalimar Bani Nugroho Barona Belladesta Benyamin Benyamin Bronto Sutopo Budi Wijaya Cahaya Rosyidan Cahyaningratri P.R. Cahyaningratri Prima Riyandhani Dedi Sunjaya Dwi Saputra, Zanuar Erick Estrada Dolok Saribu Erick Estrada Dolok Saribu Fadilah, Muhammad Irfan Faruq Daniswara Filipus Armando Armando Ginting Firman Herdiansyah Fitra Yuda, Himmes Hadi Taqiuddin, Akrom Harry Pramudito Harry Pramudito, Harry Heru P Sanusi Himmes Fitra Yuda Kefi Rahmadio Koro, Margaretha Inggrid Wuno Meirawaty, Mira Mira Meirawaty Mohammad Apriniyadi Muhammad Burhannudinnur Muhammad Irfan Fadilah Muhammad Naufa Syafrun Muhammad Taufiq Fathaddin, Muhammad Taufiq Muhammad Yusril Ihza Mahendra Triany Novela, Adita Novi Triany premjit singh singh Putri, Al Zahra Rachmayanti, Zarah Rahmadio, Kefi Rosiyanti Sinaga Rosmalia Dita Nugraheni Rosmalia Dita Nugraheni Samsol Sinaga, Rosiyanti Sinulingga, Asya Sridah Syavitri, Dewi Yarra Sutadiwiria Yeftamikha Yeftamikha Yuda, Himmes Fitra Zanuar Dwi Saputra Zefanya Gian Aginta Kembaren Zefanya Gian Aginta Kembaren Zefanya Gian Aginta Kembaren Zefanya Gian Aginta Kembaren, Zefanya Gian Aginta Kembaren