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Djayus, Djayus
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ANALISIS LINGKUNGAN PENGENDAPAN BERDASARKAN DATA WELL LOGGING DAN UJI LABORATORIUM PT. BORNEO EMAS HITAM DI TENGGARONG KALIMANTAN TIMUR Devi, Honey Puspa; Djayus, Djayus; Supriyanto, Supriyanto
GEOSAINS KUTAI BASIN Vol 3 No 1 (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.v3i1.600

Abstract

Informasi lingkungan pengendapan merupakan bagian yang penting dalam eksplorasi batubara. Tujuan dari penelitian ini yaitu untuk mengetahui lingkungan pengendapan berdasarkan defleksi kurva dari data well logging dan uji laboratorium. Penelitian ini dilakukan di PT. Borneo Emas Hitam yang berada di Tenggarong dengan menggunakan data sekunder well logging dan uji laboratorium coring batubara. Hasil penelitian menunjukkan defleksi kurva pada daerah penelitian didominasi oleh bentuk defleksi symmetrical yang dimana bentuk defleksi ini menunjukkan lingkungan pengendapan upper delta plain.
Analisis Kecepatan Tanah Maksimum di Daerah Akibat Gempa Bumi Lombok di Daerah Pengamatan Labuan Bajo, Waingapu dan Maumere Nusa Tenggara Timur 05 Agustus Tahun 2018 pangge, claudius eswinsky; Subagiada, Kadek; Djayus, Djayus
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.v5i1.730

Abstract

The ground motion velocity of an earthquake can cause material damage and loss. The purpose of this study was to analyze the maximum ground motion velocity caused by an earthquake. The data used were secondary data for earthquakes that occurred in the Lombok area of ​​West Nusa Tenggara on August 5 2018 at 06:46:37 p.m indonesian middle time zone, with the observation areas of Labuan Bajo (East Nusa Tenggara), Waingapu (East Nusa Tenggara), and Maumere (Nusa Tenggara). East Southeast). The data of this research include the coordinates of the earthquake area, the coordinates of the observation stations, the magnitude of the earthquake, and the acceleration value of ground motion as a comparison. Those data furthermore calculated the epicenter distance, the earthquake intensity value, and the ground motion velocity value was analyzed then compared with the ground acceleration value after which it was connected to the MMI scale. The results showed that the ground velocity value of the Labuan Bajo observation area was 3.66 cm / s, Waingapu 0.99 cm / s and the Maumere area 0.98 cm / s with a damage effect according to the MMI category II scale.
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.
TREN SAMBARAN PETIR CLOUD TO GROUND KOTA BALIKPAPAN TAHUN 2016-2018 Agfanny, Ferruzi; Djayus, Djayus; Supriyanto, Supriyanto
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.v3i2.693

Abstract

Lightning strikes are very dangerous natural events and can cause significant damage such as fires. Apart from causing lightning strikes, damage can also result in death if contact with living things. Because it is very dangerous, it is necessary to have a reference regarding the level of threat of lightning strikes that occur in the study area. The purpose of this research is to determine the level of lightning threat in the city of Balikpapan in the period 2016 to 2018, to determine the trend or trend of lightning strikes each year. The 2016-2018 lightning strike data obtained from the NexStrom software and Lighting Detector 2000 is a type of Cloud to Ground lightning that is struck directly to the ground and is a lightning hazard for life, then this lightning strike data is processed to find the value of the level of lightning strikes. which occurred in the city of Balikpapan in 2016- 2018. The results of this study found that the average threat level of Balikpapan City lightning strikes and the value of the threat of lightning strikes in 2016-2018.
Identifikasi Sebaran Batu Bara dari Data Well Logging Menggunakan Metode Cross Section (Studi Kasus di PT. Khotai Makmur Insan Abadi, Kalimantan Timur) Hutabarat, Melisa; Djayus, Djayus; Suprianto, Suprianto
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.v4i2.792

Abstract

Eksplorasi merupakan langkah awal dalam tahapan pertambangan yang perlu dilakukan dalam memenuhi kebutuhan konsumen. Tujuan penelitian ini untuk mengetahui sebaran batu bara berdasarkan masing-masing data log dan volume secara menyeluruh menggunakan metode cross section. Penelitian ini menggunakan data sekunder yang meliputi data titik koordinat, data bore hole, data Log Gamma dan Log Resitivtas. Data Bore hole dianalisis sehingga diketahui kedalaman dan ketebalan batu bara. Selanjutnya ditampilkan sebaran batu bara secara menyeluruh 3D menggunakan project Cross Section dan menghitung volume batu bara. Hasil penelitian menunjukkan sebaran seam batu bara yang paling sedikit yaitu 1 seam terdapat pada log KK08 dengan ketebalan rata-rata 0,665 m dan sebaran seam batu bara yang paling banyak yaitu 5 seam terdapat pada log KK02, dengan ketebalan rata-rata 1,004 m. Ketebalan seam batu bara yang paling tebal yaitu, seam 7 dan ketebalan seam batu bara yang tipis yaitu, seam 4. Hasil project Cross Section pada lima penampang didapatkan kemiringan seam batu bara yang relatif ke arah Barat dimana jurus lapisan batu bara berkisar antara N 190oE – N 200oE dengan dip berkisar antara 6o hingga 10o. Total volume 52.209.563 m3 dengan Tonase sumber daya tertujuk batu bara yaitu 67.872.432 ton/m3.
Studi Penentuan Percepatan (Acceleration) Tanah Daerah Ampana, Balikpapapan, Bone, Bulukumba, Bau-Bau Akibat Gempabumi Donggala 28 September 2018 Ansyah, Habri; Djayus, Djayus; Supriyanto, Supriyanto
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.v4i1.611

Abstract

Ground acceleration that was caused by an earthquake can cause damage both physical and material. The research aims to determine the value of ground acceleration and the effects caused by earthquake. The data used was secondary earthquake data occurred at Donggala on September 28 th, 2018 at 17:02:45 WIB, with the observation area Ampana (central Sulawesi), Bau-Bau (South East Sulawesi), Bulukumba (South Sulawesi), Bone (South Sulawesi), and Balikpapan (Balikpapan). Research data including epicenter coordinates data, coordinates of observation area and the depth of earthquake. From this data are further calculated epicenter distance and hypocenter distance. Ground acceleration value was analyzed by using the method M. V Mickey, Esteva, Mc. Guirre RK, Donovan, Oliviera and Guttenberg then connected with MMI scale. The results showed thatthe ground acceleration value of Ampana, Balikpapan and Bone was between 0.0004 g – 0.0730 g with damage effects I-V according to MMI scale. For Bulukumba and Bau-Bau was between 0.0003 g– 0.0220 g with damage effects I-IV according to MMI Scale.
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.
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.
INTERPRETASI KEDALAMAN DAN KETEBALAN LAPISAN BATUBARA DENGAN MENGGUNAKAN METODE WELL LOGGING DI PT LAMINDO INTER MULTIKON SITE BUNYU Sunarti, Sunarti; Supriyanto, Supriyanto; Djayus, Djayus
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.v3i2.694

Abstract

The purpose of this study was to determine the depth and thickness of coal seams based on gamma ray log and log density. Interpretation of DPG01 drill point at a depth of 45.15 - 58.65 m there is coal with a thickness of 13.5 m, at a DPG04 drill point depth of 30.45 - 43.40 m there is coal with a thickness of 12.95 m, DPE04 drill point a depth of 23.00 - 36.10 m there is coal A with a thickness of 13.1 m, at depth 86.20 - 96.78 m there is coal B with a thickness of 10.58 m, DPE06 drill point depth 34.57 - 44.15 m there is coal A with a thickness of 9.58 m, at a depth of 86.15 - 92.33 m there is coal B with a thickness of 6.18 m, at 100.24 - 105.05 m there is coal C with a thickness of 4.81 m and a drill point DPE07 depth of 49.74 - 65.20 m there is coal A with a thickness of 15.46 m. The results of these interpretations produce an average on each coal seam. In seam A has an average thickness of 12.91 m, seam B has an average thickness of 8.38 m and seam C has a thickness of 4.81 m.
PENENTUAN TITIK EPICENTER DAN HYPOCENTER SERTA PARAMETER MAGNITUDE GEMPABUMI BERDASARKAN DATA SEISMOGRAM Bulo, Deni; Djayus, Djayus; Supriyanto, Supriyanto
GEOSAINS KUTAI BASIN Vol 3 No 1 (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.v3i1.597

Abstract

Provinsi Banten merupakan daerah yang dekat dengan zona pertemuan dua lempeng atau biasa disebut dengan zona konvergen. Di selatan provinsi Banten terdapat pertemuan lempeng benua dengan lempeng samudera yaitu lempeng Eurasia yang menunjam lempeng Indo-Australia. Oleh karena itu daerah pulau Jawa bagian selatan rawan akan terjadinya gempa yang disebabkan oleh gesekan antara dua lempeng tersebut. Dalam penelitian ini dilakukan kajian lokasi titik epicenter dan hypocenter gempa serta parameter magnitude gempa Lebak Banten 23 Januari 2018 dengan origin time adalah 06:34:55 UTC. Pada penentuan lokasi titik epicenter digunakan hukum Laska dengan menggunakan data awal tiba gelombang P dan gelombang S pada stasiun-stasiun geofisika yang terdekat dengan pusat gempa sedangkan untuk mengetahui lokasi hypocenter atau pusat gempa digunakan metode Geiger untuk mengetahui kedalaman pusat gempa tersebut sama dengan menentukan lokasi epicenter dalam menentukan lokasi hypocenter digunakan data awal tiba gelombang P dan gelombang S pada stasiun-stasiun geofisika yang terdekat dengan pusat gempa. Mengetahui berapa besar kekuatan gempa maka digunakan persamaan empiris tiap parameter magnitude yaitu Magnitude Lokal, Broad-band Body Wave Magnitude, Magnitude Permukaan dan Magnitude Momen. Hasil dari penentuan lokasi epicenter menggunakan hukum Laska diketahui bahwa gempa tersebut berada pada koordinat Latitude -7.09 LS dan Longitude 106.03 BT sedangkan dengan menggunakan metode Geiger diketahui pusat gempa berada pada kedalaman 40 Km bumi. Masing-masing parameter magnitude diketahui Magnitude Lokal sebesar 5,22 MLv, Broad-band Body Wave Magnitude sebesar 5,42 mB, Magnitude Permukaan sebesar 5,75 Ms dan Magnitude Momen 5,71 Mw. Dengan demikiaan gempa Lebak Banten 23 Januari dikategorikan sebagai gempa dangkal oleh letak pusat gempanya dan gempa sedang (Moderate Earthquake) oleh kekuatan magnitudo gempanya.
Co-Authors -, lisa haryani Adrianus Inu Natalisanto Agfanny, Ferruzi Ansyah, Habri Antony, Nurvani Arrosyidah, Mosy R Batrisyia, Nisa Bulo, Deni Datu, Bonaria Devi, Honey Puspa Ernia, Yuyun Hasmah, Siti Hendrawanto, Benny Hutabarat, Melisa Julianti, Sri Rezeki Kadek Subagiada, Kadek Khasanah, Ulfiatul Kusmardiyanti, Retni Lepong, Piter Linda, Fitria Nova MARIA BINTANG Maulana, Risky Mislan Munir, Rahmiati Nanda Khoirunisa, Nanda pangge, claudius eswinsky Rahmiati Rahmiati Ramadhan, Adi Buchori Ramadhani, Fika Desy Rusmilawati, Depi Sadewo, Wisnu Saputra, Ary Rhamadan Sari, Bella Dessy Wulan Situmeang, Edberg Sri Wahyuni Sunarti Supriyanto Supriyanto Suryadi . Wahidah Wahidah Wibowo, Nobella Hadi Yanti, Derli Yanti, Nurma Yuliana Yuliana Yusuf, Mustaid