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Hamdi Hamdi
Department of Physics, Universitas Negeri Padang
Control & Systems Engineering Electrical & Electronics Engineering Materials Science & Nanotechnology Physics

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Microzonation Analysis of Soil Vulnerability Index of Sumani Region As Part of The Sumatra Fault System Using Microtremor: Analisis Mikrozonasi Indeks Kerentanan Tanah Daerah Sumani Sebagai Bagian Dari Sistem Sesar Sumatera Menggunakan Metoda Mikrotremor Lingga Ayunda Pradipta; Syafriani Syafriani; Hamdi Hamdi; Letmi Dwiridal
Journal of Experimental and Applied Physics Vol 1 No 3 (2023): December Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v1i3.30

Abstract

West Sumatra is a province located on the west coast of the island of Sumatra in the middle which has four active fault segments. Nagari Sumani is part of the Sumani Segment line, which makes Nagari Sumani very vulnerable to earthquakes. Efforts are needed too . reduce the impact of the earthquake in Nagari Sumani. This study aims to determine the value of soil vulnerability index (Kg) and soil vulnerability index microzonation (Kg) in Nagari Sumani, specifically Jorong Pinjangek and Jorong Guci, in the area of ​​the Sumani Segment route. The microtremor method of measuring this microtremor can determine the dominant frequency value (f0), amplification factor (A0), and soil susceptibility index value (Kg). Microtremor data was used to obtain the H/V curve at each point of data collection using Geopsy software. Seismic vulnerability index microzonation is carried out using software Surfers 13. The results of this study indicate that the seismic vulnerability index in Nagari Sumani ranges from 3.65 x 10-6 s2/cm to 99.51 x 10-6 s2/cm which has low, medium, to high categories. The results of microzonation of low soil susceptibility index (Kg) are at points 1,2,7, and 8 with a value range of 3.65 x 10-6 s2/cm to 41.02 x 10-6 s2/cm, the medium category is in points 3 and 5 with a value range of 50.02 x 10-6 s2/cm to 54.23 x 10-6 s2/cm, while the high category is at points 4 and 6 with a value range of 63.32 x 10-6 s2/cm to 99.51 x 10-6 s2/cm .
Analysis Of The Relationship Of Rare Earth Elements To Magnetic Minerals In Pumice In The Southern Tip Of Lampung Province Rifqa Hayati; Hamdi Hamdi; Letmi Dwiridal; Harman Amir
Journal of Experimental and Applied Physics Vol 1 No 3 (2023): December Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v1i3.31

Abstract

In advanced clean energy technologies, rare earth elements (REEs) are an important component. The position of rare earth elements in the future is increasingly strategic so it is necessary to strive to be developed sustainably. At the southern tip of Lampung province, rare earth elements are not yet known. The aims of this study were to analyze the magnetic susceptibility value, composition and percentage of rare earth elements, and the relationship of rare earth elements with magnetic mineral concentrations in pumice at the southern tip of Lampung Province. The method employed is rock magnetic method with Bartington Magnetic Susceptibility Meter Type B and X-Ray Fluorescence. Pumice in the southern region of Lampung Province has diverse magnetic susceptibility values, pumice from Bandar Lampung City has the highest magnetic susceptibility value, while the lowest is in South Lampung Regency. This pumice has antiferromagnetic and ferrimagnetic magnetic properties, and was found to have almost no superparamagnetic grains and also found a mixture of superparamagnetic and coarse grains. The composition of rare earth elements contained in pumice at the southern tip of Lampung Province obtained 3 rare earth elements, samples from Bandar Lampung City contained europium, cerium, and yttrium elements and samples from South Lampung Regency contained europium and yttrium elements. Rare earth elements and magnetic mineral concentration have a relationship, the obtained values decrease with increasing percentage of rare earth elements.
Analysis Of The Relationship Of Rare Earth Elements To Magnetic Mineral Concentrations In Pumice Around Sigura-Gura Dian Laila Fitri; Hamdi Hamdi; Ahmad Fauzi; Letmi Dwiridal
Journal of Experimental and Applied Physics Vol 1 No 3 (2023): December Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Rare earth elements are part of one of the strategic minerals and are included in the "critical minerals". Concentrations of rare earth elements are economically precious deposits that can be used as mining commodities. Pumice is the result of volcanic eruptions and it is one of the minerals containing the rare earth elements, one of which is found in Sigura-Gura, North Sumatra. The research aims to determine the composition of rare earth elements, the relationship between rare earth elements and magnetic mineral concentration, and to determine the concentration of magnetic minerals in pumice in Sigura-gura. The method employed is rock magnetic method with Bartington Magnetic Susceptibility Meter Sensor type B (MS2B), and X-Ray Fluorescence (XRF). Results indicated that Sigura-Gura pumice samples, and Sigura-Gura Waterfall have quite varied magnetic mineral concentrations with a range of values from 111,3 x 10-8m3/kg to 349,9 x 10-8m3/kg, with antiferromagnetic magnetic properties and grain types with almost no SP grains. Samples of Sigura-Gura pumice contain elements of Eu, Ce, and Y, while samples from Sigura-Gura Waterfall contain elements of Eu and Y. There is a correlation between the amount of magnetic minerals and rare elements, and the more elements are present in a sample, the lower the value that is produce, and the greater the percentage of elements obtained, the smaller (%) is obtained.
Analysis Of Earthquake Fault Type In 2022 in the Mentawai Region Using Waveform Inversion Method Ika Sri Fahmi; Syafriani Syafriani; Hamdi Hamdi; Letmi Dwiridal
Journal of Experimental and Applied Physics Vol 1 No 3 (2023): December Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v1i3.34

Abstract

Indonesia is a country prone to earthquake disasters, because Indonesia is located in the collision area between plates, and one of the areas in Indonesia where plate movements often occur is Mentawai. Analysis of waveform data on the 2022 earthquake in the Mentawai region was carried out to determine the type of fault. The data used in this research is local seismic data downloaded from webdc.eu. Seismic data was analyzed using waveform inversion method implemented in ISOLA program. In the ISOLA program, data processing is carried out which includes: inputting 3-component seismic data, earthquake info events, selecting stations, green functions, performing inversion, and displaying results in the form of tensor moment values, strike, dip, and rake values. From the data analysis, the moment tensor value is obtained with the range of each component of M11 is -8.348 to -3.673, M22 is 0.710 to -2.037, M33 is 7.639 to 5.710, M31 is 2.050 to 3.761, M32 is 3.484 to -5.672, M12 is -2.751 to 2.455. Then the inversion results obtained in the form of fault parameters, namely strike, dip, and rake for two nodals that will be analyzed to determine the fault plane. Based on the moment tensor value, it is found that the type of earthquake fault in 2022 in Mentawai region is dominated by reverse fault and oblique fault patterns.
Earthquake Intensity Determination Based on Maximum Land Acceleration in Padang City Area Using Atkinson Boore Method (2003) Linda Susanti; Syafriani Syafriani; Hamdi Hamdi; Letmi Dwiridal
Journal of Experimental and Applied Physics Vol 2 No 1 (2024): March Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v2i1.40

Abstract

Geologically, the city of Padang had the potential for large earthquake impacts due to its location within the Sumatran Fault, Mentawai Fault, and above the Subduction Zone. The magnitude of earthquake damage was determined by soil quality factors and earthquake intensity. To determine the extent of damage, the maximum ground acceleration value was used. This value represented the maximum ground vibration acceleration that occurred at a specific location within a particular area, resulting from all earthquakes that occurred during a specific time period. The maximum ground acceleration value and earthquake intensity in the Padang City area could be calculated using the Atkhinson Boore (2003) method. This study was a quantitative research that commenced by examining relevant theories related to the issue at hand. The research then proceeded with the collection of secondary data obtained from the United States Geological Survey (USGS) website. Specifically, earthquake data for the period between 2000 - 2020 in the Padang City area with coordinates LS- LS and BT- BT, and a magnitude M ≥ 5.0 SR depth < 100 km were utilized. Historical earthquake data was employed to determine earthquake intensity values, which were then used to assess the earthquake risk in the Padang City area. Based on the calculation results, the maximum acceleration value of soil was found between 0.519001 g- 0.603847 g. The highest value of maximum acceleration of soil was located in Bungus Teluk Kabung area, while the lowest value was found in Koto Tangah area. The distribution of earthquake intensity (MMI) in Kota Padang area has a value of VIII MMI.
Seismotectonic Analysis and Seismic Potensial of The Sumatra Region Using The Guttenberg-Richter Method Yoga Yusrila; Syafriani Syafriani; Hamdi Hamdi; Letmi Dwiridal
Journal of Experimental and Applied Physics Vol 2 No 1 (2024): March Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v2i1.46

Abstract

Sumatera is one of the most seismically active regions in Indonesia. This is due to the presence of subduction zones and active faults that influence the plate tectonic activity of the region, resulting in many earthquake events that cause damage and loss. One of the efforts to mitigate earthquake disasters is the analysis of seismotectonic parameters, which are indicated by the a-value and b-value of the Gutenberg-Richter equation in the earthquake frequency-magnitude relationship. Low seismotectonic parameters (a-value) and (b-value) can be interpreted as low seismic activity and high local rock stress conditions, and vice versa high (a-value) and (b- value). In this study, the analysis was performed spatially and temporally from the National Earthquake Information Center United States Geological Survey (NEISUSGS) earthquake catalogue. The data obtained in the form of longitude, latitude, depth, magnitude, time and location of the earthquake event, the data are limited to M ≥ 4.0Mw and Depth ≤ 350KM in the Sumatera region with the boundaries of 6030'LU-6°30'LS and 94BT-106°BT for the period 1990-2022. Based on the estimation results of the Guttenberg-Richter method in ZMAP v6 software, the b-value is 0.92-1.04 and the a-value is 7.42-7.97, with a return period of 6.5 Mw earthquakes generally ranging from 5-25 years.
Consistency of Magnetic Susceptibility Values in Raw Mix 2 using Bartington Magnetic Susceptibility Meter Sensor Type B Julio Fadjar Kolotosa; Hamdi Hamdi; Fatni Mufit; Letmi Dwiridal
Journal of Experimental and Applied Physics Vol 2 No 2 (2024): June Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v2i2.52

Abstract

The process of making cement goes through quite long stages, one of the processes is grinding at the Raw Mill. Raw Mill is divided into two large groups, Horizontal Mill and Vertical Mill, in Horizontal Factory. The milling result at the Horizontal Mill is Raw Mix 2 and quality testing will be carried out. In quality testing, testing is usually carried out on chemical parameters and there is no testing based on physical parameters. By looking for the magnetic susceptibility score of raw cement samples in Raw Mix 2 using the Bartington Magnetic Susceptibility Meter Type B sensor, you can see the consistency of magnetic minerals in raw cement in Raw Mix 2. Samples were taken from the Padang Semen Factory every hour of every day from February 1 to February 10, 2022, the samples were then measured using the Bartington Magnetic Susceptibility Meter Type B Sensor. The measurement results showed that the magnetic susceptibility value of Raw Mix 2 ranged from 79.8 x/kg to 206.9 x/kg, and standard deviation calculations were used. The data is interpreted into a graph and it shown that the magnetic susceptibility value of Raw Mix 2 obtained can be said to be consistent and of good quality. The magnetic properties of Raw Mix 2 obtained according on the magnetic susceptibility score obtained are antiferromagnetic. The grain type in Raw Mix 2 was found to have almost no superparamagnetic grains or contained less than 10% superparamagnetic grains.
Microzonation of Seismic Vulnerability In Padang Panjang Timur Sub-District, Padang Panjang City Based on Microtremor Measurement Zellvia Elizha; Syafriani Syafriani; Hamdi Hamdi; Letmi Dwiridal
Journal of Experimental and Applied Physics Vol 2 No 3 (2024): September Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v2i3.70

Abstract

Padang Panjang City is one of the cities in West Sumatra which has a high level of risk of the natural phenomenon of earthquakes. This is due to the fact that it is traversed by the active Sumatran fault which can cause earthquakes at any time. The purpose of this study was to determine the value of the seismic vulnerability index in Padang Panjang Timur District, Padang Panjang City using microtremor measurements. This type of research is descriptive research, namely research that describes the symptoms or phenomena studied. The location for data collection was Padang Panjang Timur District, Padang Panjang City, West Sumatra Province. There are 15 data collection points, and the distance between points is 500 m. The microtremor method of measuring this microtremor can determine the dominant frequency value (f0), amplification factor (A0), and susceptibility index value (Kg). Microtremor data processing was used to obtain the H/V curve at each point of data collection using Geopsy software. The results of the microzonation of the seismic susceptibility index (Kg) ranged from 1.05 × 10-6 s²/cm to 170.09 × 10-6 s²/cm. High seismic vulnerability index values ​​are found in the Koto Panjang Sub-District, Tanah Pak Lambik Sub-District, Guguk Malintang Sub-District, Ngalau Sub-District and Ganting Sub-District.
Evaluation of Pumice Source from Lubuk Basung Based on Magnetic Susceptibility Values Mutiara Kusuma Febriwanti; Hamdi Hamdi; Ahmad Fauzi; Syafriani Syafriani
Journal of Experimental and Applied Physics Vol 2 No 3 (2024): September Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v2i3.80

Abstract

Lubuk Basung is one of the distribution areas of pyroclastic material from the Maninjau Caldera eruption that occurred 50,000 years ago and produced two different types of white pumice. The research purpose is to reveal whether the pumice samples taken from Lubuk Basung come from the same eruption or not based on susceptibility of magnetic scores. The susceptibility of magnetic scores can be measured by the Rock Magnetic Method using the Bartington Magnetic Susceptibility Meter Type B. From the magnetic susceptibility values obtained, normality test, homogeneity test, and mean similarity test of two different samples were conducted using IBM SPSS Statistics software. In the LBS 23-02 sample, a susceptibility of magnetic range of 41.9 x 10-8 m3/kg to 582.2 x 10-8 m3/kg was obtained, and the LBS 23-03 DB sample obtained a magnetic susceptibility value of 42.9 x 10-8 m3/kg to 535.5 x 10-8 m3/kg. From the normality, homogeneity, and mean similarity test, it is known that the LBS 23-02 and LBS 23-03 DB samples come from a population that is not distributed normally and not homogeneous, but an average comparison is obtained with a score of significance at 0.0426, which can be concluded that the two pumice samples found in Lubuk Basung come from the same eruption source, although each sample has different types and characteristics.
Determination of the structure and crystallite size of pumice magnetic minerals from Ngarai Sianok using X-Ray Diffraction (XRD) Nur Azizah; Hamdi Hamdi; Syafriani Syafriani; Letmi Dwiridal
Journal of Experimental and Applied Physics Vol 2 No 3 (2024): September Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v2i3.86

Abstract

The structure and size of crystal are are important aspects of magnetic minerals pumice from Ngarai Sianok  to understand the geological processes of the area. Volcanic rocks in Ngarai Sianok contain magnetic minerals with unknown crystal structures. The crystal structure and size in pumice are analyzed using X-Ray Diffraction (XRD), where the type of magnetic mineral and crystal structure are determined by comparing the data measurement with the mineral database, while the crystal size can be determined using the Scherrer equation. Magnetic minerals in pumice from Ngarai Sianok are magnetite (Fe3O4) with a cubic mineral structure, ilmenite mineral (FeTiO3) with a hexagonal structure, and hematite mineral (Fe2O3) with a rhombohedral structure. The crystal size of magnetic minerals vary. The lowest is at an angle of 18.25 with a FWHM value of 0.1279 which results in a crystal size of 62.8995 nm. The highest crystal size is at an angle of 35.46 with a FWHM value of 0.0624, resulting in a crystal size of 133.6609 nm. FWHM value is inversely proportional to the size of the crystal, meaning that the size of the crystal formed is getting smaller with increasing FWHM. The average size of pumice crystals formed in Ngarai Sianok was calculated to be 102.6392 nm, the small crystal size indicates the rapid cooling of magma, usually occurring during explosive eruptions.
Co-Authors Ahmad Fauzi Anisa Janna Dian Laila Fitri Ellen Kurniawati Daya Fatni Mufit Harman Amir Ika Sri Fahmi Julio Fadjar Kolotosa Letmi Dwiridal Linda Susanti Lingga Ayunda Pradipta Mutiara Kusuma Febriwanti Nur Azizah Rifqa Hayati Syafriani Syafriani Yoga Yusrila Zellvia Elizha Zulhendra Zulhendra