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Lepong, Piter
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INTERPRETASI KECEPATAN GELOMBANG SEISMIK REFRAKSI TOMOGRAFI DALAM PENENTUAN LITOLOGI BAWAH PERMUKAAN DI DESA BHUANA JAYA (STUDI KASUS : PT. KHOTAI MAKMUR INSAN ABADI) Linda, Fitria Nova; Lepong, Piter; Djayus, Djayus
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.v2i2.473

Abstract

Research has been carried out to determine the subsurface lithology including rock type, rock layer thickness, weathered layer, and rock hardness level based on wave velocity seismic refraction tomography at Bhuana Jaya Village, PT. Khotai Makmur Insan Abadi by using the seismic refraction method. The measurement in this study uses the In Line technique, where geophone equipment is arranged in a straight line with 3 and 5 meters spacing between the geophone. Based on the results of study, there are two types of morphology namely hill and rice field areas. Hill area is interpreted which have lithology, the first layer has a thickness of less than 3 m with lithology in the form is soil as a weathered layer, the second layer has a thickness of less than 2 m with lithology in the form is siltstone, the third layer has a thickness is less than 9 m with lithology in the form is mudstone, and the fourth layer has a thickness of less than 9 m with lithology in the form is sandstone, where this area is located at very hard rock. While rice field areas are interpreted which have lithology, the first layer has a thickness of less than 10 m with lithology in the form is alluvium as a weathered layer and the second layer has a thickness of less than 10 m with lithology in the form is siltstone with sandstone inserts, where these areas are located at an easy to medium level of hardness.
APLIKASI METODE GEORADAR UNTUK IDENTIFIKASI STRUKTUR GEOLOGI DI JALAN HM. ARDAN RING ROAD 1 SAMARINDA Syam, Ardian; Lepong, Piter; Supriyanto, Supriyanto
GEOSAINS KUTAI BASIN Vol 2 No 1 (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.v2i1.355

Abstract

Research has been conducted to find out the geological structure on jl. HM. Ardan, Ring Road 1, Samarinda, East Kalimantan. Using Ground Penetrating Radar (GPR) and radar reflection profiling techniques, this method is done by bringing the receiver and transmitter antenna ground simultaneously above level and then utilize the electromagnetic wave propagations for subsurface structures identification, which in this method produce a distance value and depth in the form of radar grams. Based on the results of this study can be identified Track 1 and 2 do not show the path of a geological structure on this track because only the process that resulted in the folding Landing dash that formed folding based on field control. On track 3, based on the reflection pattern, it can be estimated there is a lithological contact between the constituent materials, on track 4 it is estimated that there is a fault down at a depth of 1.6 m to 3 m, and from the reflection pattern can illustrate the lithological contact between constituent rocks. on track 5 and track 6 there is a shallow fault and is estimated based on the diffraction pattern recorded there is a water channel at the end of the track.
Analisa Resiko Gempa Bumi pada Daerah Sesar Kalimantan dengan Metode Least Square Perkasa Putra Suhartono, Yaumil Ramadiandri; Lepong, Piter; Munir, Rahmiati
GEOSAINS KUTAI BASIN Vol 4 No 2 (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.v4i2.627

Abstract

Natural disasters can occur suddenly or through a process that takes place slowly. In some types of disasters such as earthquakes, it is almost impossible to accurately predict when, where it will occur and the magnitude of its strength. While several other disasters such as floods, landslides, droughts, volcanic eruptions, tsunamis and anomalies of the weather can still be predicted beforehand. Even so, disaster events always have a shocking effect and cause a lot of loss both soul and material The surprise occurred because of the lack of vigilance and preparedness in facing the threat of danger resulting in many casualties, injuries and material losses. For this reason, research is needed to determine the level of seismicity on the island of Kalimantan, efforts to reduce the impact of disasters and to determine areas that have the potential for earthquakes. This thesis uses the least square method to calculate the b value / vulnerability of an area, and makes a map of earthquake distribution. The island of Kalimantan has a b-value of -0.018 which means that the island of Kalimantan is classified as a safe area from devastating earthquakes, in the provinces of Kalimantan 2 provinces that have high frequencies but still have low b values. Basically, the island of Kalimantan is a relatively safe area compared to other regions in the country of Indonesia because Kalimantan is not directly crossed by earth plates, but Kalimantan still has the potential for earthquakes.
UJI DATA KONFIGURASI METODE RESISTIVITAS (KONFIGURASI WINNER, DIPOLE-DIPOLE, POLE-DIPOLE) BERDASARKAN PENGUKURAN LAPANGAN DAN UJI LABORATORIUM Dayattullah, Muhammad; Supriyanto, Supriyanto; Lepong, Piter; Rinaldi, Aditya
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 Amalia, Ani; Lepong, Piter; Natalisanto, Adrianus Inu
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 Interpolasi Inverse Distance Weighted (IDW) Dan Ordinary Kriging (OK) untuk Estimasi Volume Batubara di Area Sebuku Kalimantan Selatan Sarita, Rahma; Lepong, Piter; Asmaidi, Asmaidi
GEOSAINS KUTAI BASIN Vol. 7 No. 1 (2024)
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.v7i1.1233

Abstract

ABSTRACT The coal thickness value can be determined through estimation using the inverse distance weighted and ordinary kriging interpolation method. The aim of this research is to determine coal volume estimates using inverse distance weighted (IDW) and ordinary kriging (OK) interpolation in the Sebuku area of ​​South Kalimantan. The estimation process begins with determining the power parameters using the inverse distance weighted method. In this study, a power value of 2 was used and the spherical semivariogram model was used in the ordinary kriging method because it has the smallest Root Mean Square Error (RMSE) value compared to other models. The estimated coal volume using the inverse distance weighted method is 106,436,537.5 m3 and the estimated tonnage is 144,753,691 tons with an average thickness of 5.74 m. Meanwhile, the coal volume estimated using the ordinary kriging method was 101,421,737.5 m3 and the estimated tonnage was 137,933,563 tons with an average thickness of 5.33 m. Keywords: Estimation the coal thickness value, Inverse distance weighted, Ordinary Kriging
Analisis Kestabilan Lereng Terhadap Getaran Tanah (Ground Vibration) Akibat Aktivitas Blasting di Pit 10 PT. Alamjaya Bara Pratama Desa Jembayan Maulana, Risky; Djayus, Djayus; Lepong, Piter
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 Maulidsandy, Penta Adenata; Lepong, Piter; Mislan, Mislan
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 Julianti, Sri Rezeki; Djayus, Djayus; Lepong, Piter
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 Hasani, Ruslan; Lepong, Piter
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.
Co-Authors Abbas, Asri Yana Pratama Aditya Rinaldi Adrianus Inu Natalisanto Alamsyah, Andi Amalia, Ani Andini, Dela Antony, Nurvani Arifullah, Ery Asmaidi Asmaidi azisyarlina, Dwi Daud, Anye Gidalti Dayattullah, Muhammad Djayus Djayus, Djayus Fajarwati, Delia Aurora Firdaus, Muhamad Akmal Hadi Kusuma, Mohammad Felik Haryono, Arif Hasani, Ruslan Hendarwati, Emy Khairil Himawan Sadewo, Hengky Julianti, Sri Rezeki Laila, Nor Linda, Fitria Nova Maulana, Ansar Maulana, Risky Maulidsandy, Penta Adenata Mawadah, Anis Mislan Munir, Rahmiati Perkasa Putra Suhartono, Yaumil Ramadiandri Prasetyo, Gaguk Lulus Puspita Sari, Claudia Dewi Rahmiati Rahmiati Ramadana, Muhammad Ramadhan, Adi Buchori Rusmilawati, Depi Sarita, Rahma Sihombing, Jesika Sitorus, Merryana Desidoria Situmeang, Edberg Supriyanto Supriyanto Sutaji Putri, Devina Rayzy Perwitasari Suyitno Suyitno Syam, Ardian Tamarindi Rachman Putr, Galih Adenanthera Wahidah Wahidah