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All Journal Progressive Physics Journal Geosains Kutai Basin ANDIL Mulawarman Journal of Community Engagement
Munir, Rahmiati
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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.
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
A Study of Rayleigh Waves for Predicting Soil Carrying Capacity Using the Seismik Multi-Channel Analysis Of Surface Wave (MASW) Method Laila, Nor; Munir, Rahmiati; Lepong, Piter
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 karakteristik Sedimen di Estuari Delta Mahakam Kalimantan Timur Anggara, Geogy; Mandang, Idris; Munir, Rahmiati
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.v4i1.460

Abstract

The Mahakam Delta has complex characteristics. It has river branches to connect directly in the Makassar Strait. River discharge carries sediments from upstream to the high-salinity water in Estuary which causes mixing. The purposes of this study are to determine the characteristics of sediments and to know the pattern of sediment distribution in the Estuary of Mahakam Delta. The value of the manual processing of sediments become the initial value in modeling the pattern of sediment distribution using ECOMSED model. The model is run for 40 days (07 July - 16 August 2019). Discharge and tidal also use in the running data. The results of manual processing show the characteristics of muddy sediments with an average of 0.002 mm. The simulation results show that the pattern of sediment distribution carried by surface currents. The highest of sediment concentration when the high tide is on the Estuary and on offshore when the low tide. Keywords: The Mahakam Delta, Sediment, Distribution pattern, Sediment Characteristics
ANALISIS HUBUNGAN NILAI HGI (HARDGROVE GRINDABILITY INDEX) ASH CONTENT INHERENT MOISTURE DAN TOTAL SULFUR TERHADAP NILAI KALORI BATUBARA DI PT. GEOSERVICES SAMARINDA KALIMANTAN TIMUR Yuliana, Yuliana; Djayus, Djayus; Munir, Rahmiati; supriyanto, Supriyanto
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.v5i1.789

Abstract

Abstrak Kualitas batubara ditentukan oleh kandungan HGI, Ash Content, Inherent Moisture, Total Sulfur dan Kalori. Tujuan penelitian ini dilakukan untuk mengetahui hasil uji HGI, Ash Content, Inherent Moisture, Total Sulfur, kalori serta hubungannya dengan kalori batubara. Penelitian ini menggunakan data sekunder. Data selanjutnya dikelompokkan berdasarkan kelas kalori, kemudian dianalisis dengan regresi dan korelasi. Hasil penelitian ini adalah nilai rata-rata HGI kelas kalori sedang dan tinggi (5727, 6261) Cal/gr, Ash Content terhadap keempat kelas kalori (4609, 5600, 6361, 7394) Cal/gr, Inherent Moisture (4606, 5602, 6386, 7394) Cal/gr, Total Sulfur (4616, 5598, 6384, 7394) Cal/gr dan hubungan HGI terhadap kalori kelas sedang adalah positif dan kelas tinggi negatif, hubungan Ash Content terhadap setiap kelas adalah negatif, hubungan Inherent Moisture terhadap setiap kelas kalori adalah negatif dan hubungan Total Sulfur terhadap kalori kelas rendah dan tinggi adalah positif sedangkan kelas kalori sedang dan sangat tinggi adalah negatif. Kesimpulan dari penelitian ini adalah nilai rata-rata HGI (5727,6261) Cal/gr, Ash Content (4609, 5600, 6361, 7394) Cal/gr, Inherent Moisture (4606, 5602, 6386, 7394) Cal/gr serta Total Sulfur (4616, 5598, 6384, 7394) Cal/gr dan Hubungan HGI, Ash Content, Inherent Moisture dan Total Sulfur terhadap kalori rata-rata negatif kecuali HGI kelas sedang dan total sulfur kelas rendah dan tinggi dan berdasarkan hasil analisis interpretasi dari keempat parameter bahwa HGI tidak dapat menentukan kualitas batubara.
Identifikasi Keberadaan Hidrokarbon Menggunakan Inversi Impedansi Akustik dengan Algoritma Artificial Neural Network (ANN) Maulana, Ansar; Lepong, Piter; Sutaji Putri, Devina Rayzy Perwitasari; 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.v7i1.1127

Abstract

Hydrocarbons are the main energy source in the world, especially in Indonesia, this is what makes hydrocarbons a natural resource that has been extensively explored to determine the presence of hydrocarbons. The exploration used is the Geophysics method, namely the seismic method and the well logging method, both methods are processed to provide an overview of the subsurface. The data processing technique used is acoustic impedance inversion modeling which aims to determine the characteristics of the reservoir based on changes in the acoustic impedance value in each layer. In this study using model-based acoustic impedance inversion using an artificial neural network (ANN) algorithm and the results obtained in the inversion analysis obtained an error of 0.002, so that the model can be used on seismic trace data to produce an acoustic impedance model. modeling section with a value of less than 5000 which may mean that there are hydrocarbons in the research location. Keywords: Artificial Neural Network, Hydrocarbons, Acoustic Impedance, Inversion.
Laju Infiltrasi Air di Lubang Biopori pada Berbagai Jenis Tanah di Kelurahan Loa Bakung Arrosyidah, Mosy R; Djayus, Djayus; Mislan, Mislan; 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.v7i1.1237

Abstract

The reduction of green open space results in a lack of infiltration of rainwater into the soil and an increase in the amount of surface flow, one solution to overcome these problems is to implement a biopore infiltration hole system. This study aims to determine the rate and capacity of water infiltration in biopore holes based on various soil types in Loa Bakung Village. The infiltration rate was determined through direct measurement at 9 points in 3 locations with gleisol, podzolic, and podzolic haplik soil types, then measured by putting water into a hole with a diameter of 10 cm with a depth of 80 cm - 100 cm. The parameters measured are the difference in distance or height and time. The results of parameter measurements were made into a graph to obtain the highest infiltration rate at the research location, and determine the infiltration capacity using the Horton equation. Then, soil samples were analyzed by measuring soil physical properties that affect infiltration rates such as texture, porosity, permeability, and moisture content. The results showed that the infiltration rate and infiltration capacity varied in each location. Location 2 with podzolic soil type shows the highest infiltration rate and capacity value of 2820 cm/hour with an infiltration capacity of 2782.84 cm/hour. Followed by location 1 which is a gleisol soil type of 1224 cm/hour with an infiltration capacity of 1217.72 cm/hour, and the lowest value is shown in location 3 with a haplik podzolic soil type of 1050 cm/hour with an infiltration capacity of 1041.46 cm/hour.
: Analisis Persebaran Intensintas Penerangan Di Laboratorium Balai Keselamatan Dan Kesehatan Kerja (K3) Samarinda Berdasarkan PERMANKER No. 5 Tahun 2018 Menggunakan Metode Mapping Hasmah, Siti; Munir, Rahmiati; Djayus, Djayus; Putri, Erlinda Ratnasari
Progressive Physics Journal Vol. 5 No. 1 (2024): Progressive Physics Journal
Publisher : Program Studi Fisika, Jurusan Fisika, FMIPA, Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ppj.v5i1.1032

Abstract

A light is needed by humans to recognize an object visually. Good lighting allows people to see the objects they are working on clearly and quickly. There is a national standardization that is used as a race for the intensity of lighting that is categorized based on the type of work performed. Therefore, this study aims to determine the level of intensintas lighting in the Laboratory of the Center for Occupational Safety and health (K3) Samarinda based PERMENAKER No. 5 of 2018. In this study using the mapping method used as the determination of the coordinate points and then use the Lux meter EC 1 and Laser Meter Distance for data retrieval illumination. The results obtained the intense level of illumination in the Laboratory of the Center for Occupational Safety and health (K3) Samarinda based on PERMENAKER No. 5 of 2018 (lighting standards according to job classification) the work areas that meet the standards are on the administration workbench, pretreatment table (Room 8), and fume hood laying room (Room 7) while the work areas of the weighing room (Room 1), UV-VIS room (Room 2), Spectrophoto room (Room 3), Natural absorption room (Room 4), and solid chemical room (Room 5) did not meet the standards.
Kajian Nilai B-Value untuk Menganalisis Aktivitas Seismik di Wilayah Pulau Jawa, Bali dan Nusa Tenggara Barat Munir, Rahmiati; Nurahmah, Laila; Friesky, Vindhiyah; Imran, Muh; Haryono, Arif
GEOSAINS KUTAI BASIN Vol. 7 No. 2 (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.v7i2.1436

Abstract

This study aims to analyze seismic activity in East Java, Bali, and West Nusa Tenggara (NTB) using the b-value parameter. Earthquake data from the USGS catalog (2000–2023) were analyzed using Zmap software. To facilitate the analysis of the spatial distribution of b-values and seismic activity patterns in the study area, the region was divided into three areas: Region 1 covers most of West Java and Central Java, Region 2 includes the southern part of Central Java and part of East Java, while Region 3 covers East Java, Bali, and West Nusa Tenggara (NTB). The analysis steps include separating the main earthquake data, determining the b-value, and spatial mapping. The results show that b-values range from 0.4 to 1.9, where lower values (0.4–1.13) reflect high stress accumulation that may lead to large earthquakes, such as in Lombok, NTB. Conversely, higher values (1.13–1.9) indicate low stress, as seen in Sumbawa and the Indian Ocean. This study concludes that the study area exhibits different seismic activity patterns, with NTB as a high-risk area compared to East Java and Bali, in line with the distribution of b-values.
Analisis Pola Seismisitas Berdasarkan Nilai B-Value di Wilayah Laut Flores Rosidi, Fachrul; Azisyarlina, Dwi; Wati, Lia Nurfitriana; Munir, Rahmiati; Haryono, Arif; Imran, Muh
GEOSAINS KUTAI BASIN Vol. 8 No. 1 (2025)
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.v8i1.1478

Abstract

The Flores Sea, located within Indonesia's territorial waters, is an area with high volcanic and seismic activity due to its position within the Pacific Ring of Fire. The complex movement of tectonic plates frequently triggers earthquakes in this region. This study was conducted to analyze earthquake potential in three segments of the Flores Sea area based on b-value and to examine earthquake events with magnitudes ≥ 7.4 within the period from 2000 to 2023 using Matlab and Zmap applications. From the analysis, it was found that Segment 1 has a higher potential for major earthquakes due to its low b-value. Meanwhile, Segment 2 shows a b-value below 1.19, indicating a significant potential for major earthquakes. In contrast, Segment 3 exhibits a b-value above 1.11, suggesting a lower likelihood of large-scale earthquakes. However, significant earthquakes can still occur, such as the one in Lospalos in December 2021 with a magnitude of 7.6. This demonstrates that, despite lower risk based on b-value, major earthquakes remain possible. Overall, from 2000 to 2023 in the Flores Sea region, only two events were recorded with magnitudes exceeding ≥ 7.4: one in Segment 2 with a magnitude of 7.5 in 2005, and another in Segment 3 with a magnitude of 7.6 in 2021.
Co-Authors Anggara, Geogy Arrosyidah, Mosy R azisyarlina, Dwi Dadan Hamdani, Dadan Djayus, Djayus Friesky, Vindhiyah Hamdi, M. Khilal Haryono, Arif Hasmah, Siti Idris Mandang, Idris Imran, Muh Khairunnisa, Nia Laila, Nor Lepong, Piter Maulana, Ansar Mislan Munir, Rahmawati Murtadha, Nayla Izzatil Nurahmah, Laila Perkasa Putra Suhartono, Yaumil Ramadiandri Rosidi, Fachrul Supriyanto Supriyanto Sutaji Putri, Devina Rayzy Perwitasari wati, lia nurfitriana Yuliana Yuliana