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Piter Lepong
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Journal : Geosains Kutai Basin

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UJI DATA KONFIGURASI METODE RESISTIVITAS (KONFIGURASI WINNER, DIPOLE-DIPOLE, POLE-DIPOLE) BERDASARKAN PENGUKURAN LAPANGAN DAN UJI LABORATORIUM Muhammad Dayattullah; Supriyanto Supriyanto; Piter Lepong; Aditya Rinaldi
JURNAL GEOSAINS KUTAI BASIN Vol 1 No 2 (2018)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v1i2.285

Abstract

Geoelectric Resistivity is one of the geophysical methods that utilize different electrical properties in the earth in the form of resistance type in rocks. In this research, was measurements on Kadrie Oening Street at Pulau Balang formation and measurement of laboratory scale resistivity at Electronic and Instrumentation Laboratory. From the field measurements, three configurations are used: Wenner Alpha, Dipole-Dipole and Pole-Dipole. From the three configurations, sandstone resistivity value between 11.93 W.m to 33.61 W.m, clay ranged between 3.86 W.m to 10.82 W.m, siltstone range between 4.80 W.m to 9.72 W.m, coal ranged between 83.88 W.m to 216.47 W.m. The resistivity data inversion shows that the Wenner Alpha and Dipole-Dipole configurations are more compatible with field conditions in displaying the slope of the coating than the Pole-Dipole configuration.
Analisis Spasial Ordinary Kriging Persebaran Emas Berdasarkan Data Geokimia Permukaan Awak Mas, Sulawesi Selatan Ani Amalia; Piter Lepong; Adrianus Inu Natalisanto
JURNAL GEOSAINS KUTAI BASIN Vol 5 No 2 (2022)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v5i2.798

Abstract

Kadar emas dapat diketahui dari hasil pengujian laboratorium dan atau dengan dilakukannya prediksi dengan teknik interpolasi Ordinary Kriging. Tujuan penelitian ini adalah untuk estimasi penyebaran kadar emas di Awak Mas Project menggunakan data sekunder dari hasil channel dan sampling data permukaan. Tahapan yang dilakukan adalah dengan memilih model semivariogram terbaik diantara semivariogram Spherical, Eksponensial, dan Gaussian dan menafsirkan pola penyebaran mineral emas menggunakan metode geostatistik ordinary kriging berdasarkan data sampling channel mineralisasi emas permukaan. Langkah pertama dalam pengolahan data adalah membuat semivariogram menggunakan software SGEMS dengan nilai nugget, sill, dan range masing-masing sebesar 0,01, 0,1, dan 600. Kemudian diinterpolasi menggunakan ketiga model untuk mendapatkan model terbaik berdasarkan nilai RMSE terkecil, model yang didapatkan adalah model Gaussian. Hasil dari penelitian ini adalah pola penyebaran mineral emas permukaan banyak ditemukan pada daerah barat laut (NW) dan barat daya (SW) yang dipengaruhi oleh struktur geologi
Analisis Kestabilan Lereng Terhadap Getaran Tanah (Ground Vibration) Akibat Aktivitas Blasting di Pit 10 PT. Alamjaya Bara Pratama Desa Jembayan Risky Maulana; Djayus Djayus; Piter Lepong
JURNAL GEOSAINS KUTAI BASIN Vol 3 No 2 (2020)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v3i2.679

Abstract

This research aims to find out how stable the slopes of the mine are always given ground vibration results from blasting activities. This research was done by estimating the stability of the mine's highwall slope and subsequently given the vibration results from the blasting activity for 30 days using Rocscience SLIDE 6.0 software. The results of this research indicate that the level of ground vibration is too large so that the possibility of landslides on the highwall slopes is very high. So the calculation is done to reducing the amount of ground vibration, one way is to estimate the contents of explosives at a certain distance.
SOIL MOVEMENT ANALYSIS BASED ON MAXIMUM SOIL SPEED PATTERNS DUE TO THE LOMBOK EARTHQUAKE Penta Adenata Maulidsandy; Piter Lepong; Mislan Mislan
JURNAL GEOSAINS KUTAI BASIN Vol 5 No 1 (2022)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v5i1.780

Abstract

ABSTRACT Earthquake activity in Lombok, West Nusa Tenggara (NTB) gives rise to ground movement, this ground movement can be used to predict the intensity of the next earthquake. The purpose of this study is to determine the movement of land based on the pattern of maximum soil velocity that occurred due to the Lombok Earthquake July 29, 2018, which can be used to predict the intensity of the next earthquake. This study uses secondary earthquake data (magnitude) obtained from the USGS (United States Geological Survey). Magnitude data were analyzed using empirical formulas so that the values ​​of intensity, maximum ground velocity and contour maps were obtained. The results show that the movement of the land due to the earthquake moved very quickly towards the north, quickly towards the east, quickly towards the south and finally to the south slowly. The highest maximum ground velocity located in Obel-Obel Village with the value of 23,2 cm / s. The calculation result in the form of this maximum ground velocity can be used as a parameter to predict the upcoming earthquakes that will occur at Lombok or the other side of world.
Analysis of Scale Distance Correlation to Soil Vibration in Coal Blasting Operations Sri Rezeki Julianti; Djayus Djayus; Piter Lepong
JURNAL GEOSAINS KUTAI BASIN Vol 4 No 1 (2021)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v4i1.740

Abstract

The optimum vibrations generated from the delay, distance, and explosive settings on the destruction of the ground cover or OB can accumulate the effect of the damage. Research was purposed to view the process of coal blasting and the impact of distance and explosives the detonation process. The data used in the research is a secondary force of distance, explosives, drilling patterm (7 m burden and 8 m distance ) and blasting pattern (Staggered patten/Zig-zag).Data are prepared using Microsoft Excel by inserting distance and explosives materials and for PPV value. PPV value is compared with the distance value (scaled distance). The result of research shows the process of blasting using a zig-zag system with distance between 7m and spacing 8m, depth of 3m - 14m. Explosived material content (ANFO) with averaged 101.74. The impact of the distance and the explosives materials from PPV calculations is not very significantly indicated by the PPV value of 3,62mm/s.
IDENTIFIKASI ZONA LEMAH BIDANG GELINCIR MENGGUNAKAN METODE SEISMIK REFRAKSI TOMOGRAFI Ruslan Hasani; Piter Lepong
JURNAL GEOSAINS KUTAI BASIN Vol 1 No 2 (2018)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v1i2.286

Abstract

This research was performed the identifity the lithology of weak zone as a surface of the landslide based on seismic velocity of seismic refraction tomography. The research was conducted on the main road of Tenggarong-Kutai Barat and also on the road of Samarinda-Tenggarong, in Kalimantan Timur. Data acquisition was conducted in one line travel with nine shot point in the same interval. This method used the picking first break of the seismic trace. This travel time as send input data of the Rayfract software of processing of seismic refraction tomography. The processed data shown the image of the seismic velocity of subsurface. The slip surface is interpretated from the boundry of sandstone and clay with velocity of (400 m/s - 1000 m/s) and of (1000 m/s -2500 m/s) respective. The identification on each revealed the types of rock in the study area.
A Study of Rayleigh Waves for Predicting Soil Carrying Capacity Using the Seismik Multi-Channel Analysis Of Surface Wave (MASW) Method Nor Laila; Rahmiati Munir; Piter Lepong
JURNAL GEOSAINS KUTAI BASIN Vol 6 No 1 (2023)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v6i1.1070

Abstract

This research was conducted to determine subsurface lithology and soil carrying capacity in the study area by using the results of shear wave analysis using the MASW seismik method. This study used secondary seismic refraction data with three lines, where the data was collected on street Poros Samarinda-Tenggarong, East Kalimantan. Data processing is divided into two stages, namely the determination of the dispersion and inversion curves to produce shear wave velocity values. The resulting shear wave value is used to analyze the soil bearing capacity. The results of this study are that there is sandstone material (unsaturated) in the first layer and clay rock and at that location has a soil permit carrying capacity value range of 74.46-79.8 KPa with a moderate soil type class.
STUDI MEKANISME SUMBER GEMPABUMI DI WILAYAH KALIMANTAN BERDASARKAN GERAK AWAL GELOMBANG P Depi Rusmilawati; Djayus Djayus; Piter Lepong
JURNAL GEOSAINS KUTAI BASIN Vol 2 No 2 (2019)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v2i2.470

Abstract

Pulau Kalimantan selama ini dikenal sebagai pulau yang relatif aman dari gempa bumi. Tujuan penelitian ini adalah Mengetahui mekanisme sumber gempabumi dengan menggunakan data gerak awal dari gelombang P dan mencari penyebab dari kejadian gempabumi di wilayah Kalimantan tahun 2015-2018. Dilakukan pengolahan data menggunakan program fokal mekanisme dengan memilih data gempa bumi yang mempunyai magnitude ≥ 4 Skala Ricther (SR). Penelitian ini menggunakan metode gerak awal gelombang P dengan penentuan polaritas gelombang yang berupa gelombang naik (kompresi) dan gelombang turun (dilatasi). Dari hasil analisis fokal mekanisme gempabumi Kalimantan 2015-2018 diperoleh nilai parameter orientasi bidang sesar berupa strike, dip dan rake. Untuk strike di Kalimantan bagian Utara 114- 170, Dip 80-90 dan Rake -2 – (-136). Sedangkan di Kalimantan Timur, Strike 158- 174, Dip 85-89 dan Rake 2-179. Kalimantan Selatan dengan Strike 127- 159, Dip 40-47 dan Rake 88-97. Hasil penelitian ini menunjukan bahwa penyebab gempa Kalimantan bagian Utara secara umum berupa sesar oblique dan Sesar geser (strike slip). Sedangkan Kalimantan bagian Timur merupakan sesar geser (strike slip) serta Kalimantan bagian Selatan berupa sesar naik (reverse fault) dan Sesar oblique (oblique reverse fault).
Perbandingan Nilai Resistivitas Menggunakan Metode Logging Resistivitas Listrik dan Electrical Resistivity Tomography (ERT) Nurvani Antony; Piter Lepong; Wahidah Wahidah; Supriyanto Supriyanto; Djayus Djayus
JURNAL GEOSAINS KUTAI BASIN Vol 6 No 2 (2023)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v6i2.1094

Abstract

Metode geolistrik sering digunakan untuk menginterpretasikan lapisan bawah permukaan yang dangkal. Namun dalam kenyataannya, metode ini memberikan pengukuran resistivitas bawah permukaan yang berbeda dengan metode log resistivitas. Selain itu, metode ini memiliki kelemahan dalam membaca lapisan tipis saat kedalaman pengukuran bertambah. Oleh karena itu, dilakukan penelitian ini untuk membandingkan metode geolistrik dan log resistivitas, serta menentukan faktor-faktor yang menyebabkan perbedaan pengukuran tersebut. Penelitian ini menggunakan data sekunder yang nantinya diolah menggunakan software tertentu. Data geolistrik diolah menggunakan Res2DINV untuk memperoleh penampang resistivitas 2D. Kemudian data log resistivitas diolah menggunakan WellCAD untuk memperoleh kurva resistivitas. Kedua hasil tersebut digabungkan dalam satu gambar untuk dibandingkan dan dianalisis perbedaannya. Hasil yang diperoleh menunjukan bahwa nilai resistivitas semu yang ditampilkan penampang geolistrik lebih kecil dibandingkan kurva resistivitas milik log resistivitas. Selain itu, terdapat sedikit perbedaan interpretasi antara keduanya, dimana metode geolistrik tidak dapat membaca lapisan tipis yang cukup dalam, seperti batubara, dan metode log resistivitas tidak dapat membaca lapisan clay.
Penentuan Litologi Batuan di Daerah Samboja Berdasarkan Analisis Pemodelan 3D Data Cutting dan Data Logging Geofisika Edberg Situmeang; Djayus Djayus; Wahidah Wahidah; Supriyanto Supriyanto; Piter Lepong
JURNAL GEOSAINS KUTAI BASIN Vol 6 No 2 (2023)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v6i2.1087

Abstract

The interpretation of rock lithology is inaccurate if it only uses cutting data, so it must be assisted with other data, including logging data. The purpose of this study was to determine the lithological arrangement of rocks based on cutting data and logging data and to compare the cross section results of cutting data and logging data. This study uses cutting data and logging data (gamma ray log and density log). Cutting data and logging data will be interpreted and processed into 2D and 3D sections which are corrected with topographical data including coordinates, elevation values, strike dip and total depth. The results of processing from both methods, obtained lithology composition in the form of soil, silt, sand, coal, clay, carbon and carbont clay.
Co-Authors Adi Buchori Ramadhan Aditya Rinaldi Adrianus Inu Natalisanto Andi Alamsyah Ani Amalia Ardian Syam Claudia Dewi Puspita Sari Dela Andini Delia Aurora Fajarwati Depi Rusmilawati Djayus Djayus Edberg Situmeang Emy Khairil Hendarwati Fitria Nova Linda Galih Adenanthera Tamarindi Rachman Putr Hasani, Ruslan Laksono Trisnantoro Merryana Desidoria Sitorus Muhammad Dayattullah Muhammad Ramadana Nor Laila Nurvani Antony Penta Adenata Maulidsandy Rahmiati Munir Risky Maulana Sri Rezeki Julianti Supriyanto Supriyanto Suyitno Suyitno Wahidah Wahidah