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Rahmiati
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Geosains Kutai Basin
Published by Universitas Mulawarman
ISSN : -     EISSN : 26155176     DOI : https://doi.org/10.30872/geofisunmul.v5i2
Core Subject : Science,
Earth & Planetary Sciences
Coastal and Ocean Dynamics Environmental of Geophysics Geodesy and Geography Geographic Information System Geology Geophysics Exploration Geotechnical/ geo-engineering Hazard Mitigation Hydrology Meteorology and Climatology Mining Engineering Seismology and Volcanology Oceanography
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geofisika
Articles 108 Documents
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Mapping the Golden Hour: A Spatiotemporal Analysis of Ambulance Response Time in Urban Jakarta Jailani, Zakiul Fahmi; Nurmadewi, Dita; Syumanjaya, Raden Bambang; Manik, Ni Kadek Sri
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.v6i2.1188

Abstract

This study aims to map the ambulance response time in Jakarta city and assess the current ambulance to population ratio. The data used in this study include hospital point data retrieved from OpenStreetMap (OSM), manually digitized data points, and a database from community/non-government organizations that manage their own ambulance. The analysis was conducted using a combination of buffer, service area, and overlay tools in GIS (Geo-information System) software. The results show that the current ambulance to population ratio in Jakarta is inadequate, with only 78 ambulances available that can only serve a total population of 5,598,058 out of all 10,748,230 people in Jakarta. This means that at least 215 ambulances are needed to provide comprehensive coverage for the entire population. Furthermore, the golden time for ambulance response, as set by the Ministry of Health in Indonesia, is less than 15 minutes. However, the current ambulance to population ratio in Jakarta makes it difficult to meet this standard.
Eksplorasi Batuan Andesit Berdasarkan Interpretasi Data Resistivitas Di Desa Petangis, Kecamatan Batu Engau, Kabupaten Paser Sihombing, Jesika; Lepong, Piter; Supriyanto, Supriyanto
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.v6i2.1126

Abstract

Exploration activities are very important before mining andesite rocks. This research was conducted in Petangis Village, Batu Engau District, Paser Regency using the Wenner-Schlumberger geoelectric resistivity method with 10 tracks, where 7 tracks have a length of 705 meters in an East-West direction and 3 tracks have a length of 235 meters in a North-South direction. The purpose of this study is to identify the resistivity value of andesite rocks and determine the 2D and 3D distribution of andesite rocks based on the obtained resistivity values. Based on the 2D resistivity section results, it was found that in the study area, andesite rocks have resistivity values ranging from 212-460 Ωm with varying depths of 1-52 meters and the 3D modeling results indicate that andesite rocks are predominantly distributed on the East side with an estimated volume of 1.34588e+007 m3. Keywords: Andesite, Exploration, Resistivity, Wenner-Schlumberger.
Perbandingan Nilai Resistivitas Menggunakan Metode Logging Resistivitas Listrik dan Electrical Resistivity Tomography (ERT) Antony, Nurvani; Lepong, Piter; Wahidah, Wahidah; Supriyanto, Supriyanto; Djayus, Djayus
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.
Estimasi Sumberdaya Nikel Menggunakan Metode Inverse Distance Weighted (IDW) Berdasarkan Data Eksplorasi Daerah X Kecamatan Nuha Kabupaten Luwu Timur Sulawesi Selatan Prasetyo, Gaguk Lulus; Lepong, Piter; Wahidah, Wahidah
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.v6i2.1129

Abstract

Estimasi sumberdaya berperan penting dalam penentuan kualitas dan kuantitas dari suatu endapan di suatu daerah eksplorasi. Metode estimasi yang dipilih disesuaikan dengan kondisi geologi dan mineralisasi. Penelitian ini bertujuan untuk menentukan estimasi sumberdaya nikel dengan menggunakan metode Inverse distance Weighted di daerah X Kecamatan Nuha Kabupaten Luwu Timur Sulawesi Selatan. Jumlah titik bor yang digunakan dalam perhitungan sumberdaya adalah 125 titik bor. Dari data tersebut akan dibuat model blok awal dari batas limonit dan saprolit, kemudian digunakan interpolasi IDW pada model blok tersebut untuk menghasilkan estimasi sumberdaya. Hasil estimasi sumberdaya nikel menggunakan IDW menunjukan tonase sumberdaya Ni sebesar 1.899.938 ton dengan rata-rata kadar Ni 2,07%. Berdasarkan hasil yang sudah didapatkan terdapat faktor yang mempengaruhi dalam perhitungan yaitu metode IDW menghitung suatu nilai berdasarkan titik data yang terdekat dengan blok dan hanya memperhatikan jarak sehingga data dengan jarak yang sama namun memiliki sebaran data yang berbeda akan menghasilkan hasil yang sama. Dari hasil klasifikasi sumberdaya sebagian besar sebaran titik bor tergolong dalam klasifikasi sumberdaya terukur.
Interpretasi Data Geophysical Logging untuk Penentuan Sebaran Seam Batubara dalam Bentuk Model 3D Batrisyia, Nisa; Djayus, Djayus; Supriyanto, Supriyanto
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.
Analisis Proksimat dan Ultimat Terhadap Total Sulfur dan Nilai Kalori pada Batubara (PT Geoservices Samarinda) Fajarwati, Delia Aurora; Lepong, Piter; Wahidah, Wahidah
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.v6i2.1145

Abstract

The price of coal in the market is largely determined by the caloric value. To find out what parameters affect the calorific value, it is necessary to do a correlation between the calorific value, inherent moisture, ash content and volatile matter contained in the coal where these contents are found in the proximate analysis and the carbon, nitrogen and hydrogen content in the ultimate analysis. In this study, apart from correlating the proximate data and ultimate data with calorific value, these two data were also correlated with total sulfur because sulfur greatly impacts the environment, so it is necessary to ensure that the amount is below the set threshold. The correlation used is Pearson Correlation. Determination of coal classification using standards Americans Society For Testing & Materials (ASTM). Correlation test results showed that total sulfur had a very strong correlation with inherent water content, volatile matter content, fixed carbon and hydrogen content. The calorific value correlates very strongly with the inherent water content, fixed carbon and nitrogen content. However, total sulfur and calorific value did not correlate with ash content. The coal classification of the five samples is included in the sub-bituminous class with a calorific value range of 10,500 Btu/lb - 8,300 Btu/lb.
Penentuan Litologi Batuan di Daerah Samboja Berdasarkan Analisis Pemodelan 3D Data Cutting dan Data Logging Geofisika Situmeang, Edberg; Djayus, Djayus; Wahidah, Wahidah; Supriyanto, Supriyanto; Lepong, Piter
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.
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.
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
Penentuan Status Mutu Air Laut Menggunakan Metode Indeks Pencemaran di Perairan Bontang Kalimantan Timur Khairunnisa, Nia; Mandang, Idris; Munir, Rahmiati
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.v7i1.955

Abstract

Bontang City is a coastal city in East Kalimantan, directly bordering the Makassar Strait, with numerous residential, industrial, and trade areas along its coastline. These activities can impact the decline in seawater quality in Bontang City's coastal waters. The decrease in seawater quality will diminish the usability, productivity, and capacity of aquatic resources, ultimately reducing the wealth of natural resources. The high human activity along Bontang's coast is feared to cause seawater pollution, affecting the management of seawater quality now and in the future. This research aims to determine the quality status of seawater in Bontang waters using the Pollution Index (IP) method. Water quality sampling took place in September 2021 at 8 research stations and was analyzed at Mulawarman University's Water Quality Laboratory. The results were then compared with seawater quality standards based on Government Regulation No. 22 of 2021. The research findings categorize the seawater quality status in Bontang waters using the Pollution Index (IP) method as lightly polluted at all observation stations, with a range of values 1 > IP > 5. Parameters contributing to this condition are PO4-P and DO that do not meet quality standards. Parameters in accordance with quality standards for marine and port tourism include temperature, salinity, pH, BOD5, NO3N, and NH3-N. The increase in parameters exceeding the maximum quality standards comes from natural sources and industrial waste from high community activities

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