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Djayus Djayus
Program Studi Geofisika FMIPA Universitas Mulawarman
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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.
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.
INTERPRETASI KEDALAMAN DAN KETEBALAN LAPISAN BATUBARA DENGAN MENGGUNAKAN METODE WELL LOGGING DI PT LAMINDO INTER MULTIKON SITE BUNYU Sunarti Sunarti; Supriyanto Supriyanto; Djayus Djayus
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.v3i2.694

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 Deni Bulo; Djayus Djayus; Supriyanto Supriyanto
JURNAL 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.
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.
Interpretasi Data Geophysical Logging untuk Penentuan Sebaran Seam Batubara dalam Bentuk Model 3D Nisa Batrisyia; Djayus Djayus; Supriyanto Supriyanto
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.v6i2.1086

Abstract

In coal exploration activities, geophysical methods are usually used. One of the most accurate and effective geophysical methods that is still used in coal exploration today is the well logging method. The purpose of this research is to determine the distribution of coal seams in 3D based on well logging data. The data used in this study is secondary data which includes Gamma Ray Log data, Density Log data, and coordinate point data. Gamma Ray Log and Density Log data are interpreted to determine the types of lithology that make up the drill holes, especially coal. Based on the interpretation of the 3D model of the distribution of coal seams in each data it is known that in Seam A it tends to thin to the Southeast and thicken to the North-East, in Seam B it tends to thin out to the Southeast and Northeast, and in Seam C it tends to split to the North-West. and Northeast with a strike ranging from N 53ºE to N 116ºE with a dip ranging from 5º to 12º.
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 Adrianus Inu Natalisanto Adrianus Inu Natalisanto Ary Rhamadan Saputra Bella Dessy Wulan Sari Benny Hendrawanto Bonaria Datu claudius eswinsky pangge Deni Bulo Depi Rusmilawati Derli Yanti Edberg Situmeang Ferruzi Agfanny Fitria Nova Linda Habri Ansyah Honey Puspa Devi Kadek Subagiada Kadek Subagiada Laksono Trisnantoro Melisa Hutabarat Mustaid Yusuf Nisa Batrisyia Nobella Hadi Wibowo Nurma Yanti Nurvani Antony Piter Lepong Rahmiati Munir Retni Kusmardiyanti Risky Maulana Sri Rezeki Julianti Sri Wahyuni Sunarti Sunarti Suprianto Suprianto Suprianto Suprianto Supriyanto Supriyanto Suryadi . Ulfiatul Khasanah Wahidah Wahidah Wisnu Sadewo Yuliana Yuliana Yuyun Ernia