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All Journal POSITRON Jurnal Penelitian Fisika dan Aplikasinya (JPFA) IJOG : Indonesian Journal on Geoscience JGE (Jurnal Geofisika Eksplorasi) JURNAL ILMIAH PENDIDIKAN FISIKA AL BIRUNI Teknisia Jurnal Geosaintek Gravity : Jurnal Ilmiah Penelitian dan Pembelajaran Fisika Jurnal Fisika FLUX Jurnal Geocelebes Indonesian Physical Review Journal of Engineering and Scientific Research (JESR) Jurnal Geofisika Asimtot : Jurnal Kependidikan Matematika Jurnal Teras Fisika : Teori, Modeling, dan Aplikasi Fisika Journal of Innovation and Technology JIFP (Jurnal Ilmu Fisika dan Pembelajarannya) JURNAL TEKNIK GEOLOGI : Jurnal Ilmu Pengetahuan dan Teknologi Prosiding Seminar Nasional Hasil Penelitian Sains, Teknik dan Aplikasi Industri Fakultas Teknik Universitas Lampung Jurnal Rekayasa Geofisika Indonesia Jurnal Geosaintek
Syamsurijal Rasimeng
Universitas Lampung
Astronomy Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics

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Fractal Dimension Analysis and Earthquake Repeated Period Estimation in the Southern Part of Sumatra Subduction Zone (Bengkulu-Lampung-Sunda Segment) Syamsurijal Rasimeng; Masdar Helmi; Tugiyono Tugiyono; Suharno Suharno
Indonesian Journal on Geoscience Vol 9, No 3 (2022)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.9.3.383-394

Abstract

DOI:10.17014/ijog.9.3.383-394An earthquake seismicity parameter study has been conducted in the southern part of the Sumatra Subduction Zone (SSZ) for the period of 1919 to 2019 with a hypocentre depth of 120 km and magnitude of ≥4Mw. The researched area is divided into three segments, Bengkulu, Lampung, and Sunda segments, respectively. This study aims to evaluate the seismicity parameters in the form of a-value, b-value, fractal dimension, and probabilities of earthquake recurrence period. Frequency-magnitude correlation statistical approach introduced by Gutenberg-Richter was used to calculate the seismicity parameters based on catalogue data obtained from USGS. An a-value variation of 5.11±1.84 to 5.85±2.46 obtained indicates the most dominant seismic intensity. b-value of 0.69±0,.17 to 0.83±0.35 correlates with high-stress levels, the level of spatial heterogeneity on the SFZ, and the probabilities of bigger earthquakes in the future. The calculation of fractal dimension of 1.4±0.33 to 1.7±0.71 indicates an earthquake distribution pattern was caused by a single fracture zone along the southern part of SSZ. The fracture zone is located on the left and right sides of the southern part of SSZ, which may not have been connected. In addition, the calculation result of earthquake recurrence period with magnitude ≥6.5Mw indicates that there will be an 5 - 6 earthquake event in the Bengkulu segment, 2 - 3 event in the Lampung segment, and 1 - 2 event in the Sunda segment, while the probabilities of an earthquake with magnitude ≥7.5Mw along the southern part of SSZ is 1 - 2 times.
VALIDASI PENGARUH JUMLAH PARTISI DALAM PERHITUNGAN METODE INTEGRASI NUMERIK TERHADAP TINGKAT AKURASI DAN GALAT MENGGUNAKAN MATLAB (STUDI KASUS: RIEMANN KIRI DAN ATURAN TRAPESIUM) Emir Dzakwan Kamal Zein; Syamsurijal Rasimeng; Ilham Dani
Asimtot : Jurnal Kependidikan Matematika Vol 4 No 1 (2022): Asimtot: Jurnal Kependidikan Matematika | Juni 2022 - November 2022
Publisher : Program Studi Pendidikan Matematika Universitas Katolik Widya Mandira

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30822/asimtot.v4i1.1942

Abstract

Metode integrasi numerik digunakan sebagai solusi untuk menyelesaikan persoalan yang tidak bisa dikerjakan dengan cara biasa. Penelitian ini berfokus kepada metode integrasi Riemann kiri dan aturan trapesium dengan tujuan untuk mengetahui tingkat akurasi serta galat yang dipengaruhi oleh banyaknya partisi dalam proses perhitungan. Uji coba beberapa penyelesaian soal integral menggunakan software MATLAB dari suatu jenis fungsi polinomial, trigonometri, dan ekspnonen dilakukan untuk memvalidasi pengaruh banyaknya partisi terhadap tingkat keakuratan dan galat dari setiap metode integrasi numerik. Hasil yang didapatkan yakni tingkat keakuratan eksperimental dengan menggunakan metode integrasi Riemann kiri semakin mendekati nilai 1 seiring bertambahnya jumlah partisi, sedangkan jika menggunakan metode integrasi aturan trapesium mendekati nilai 2. Selain itu, secara umum nilai galat semakin kecil seiring bertambahnya jumlah partisi yang digunakan untuk komputasi numerik. Nilai galat yang dihasilkan metode integrasi aturan trapesium lebih kecil dibandingkan metode intergasi Riemann kiri pada jumlah partisi yang sama sehingga lebih baik.
The Initiation Study on the Gold Potential Resources at West Coast Area in Lampung Province, Indonesia Akroma Hidayatika; Suharno; Rahmi Mulyasari; Hesti; Idabagus S Yogi; Arif P Prabowo; Syamsurijal Rasimeng
Journal of Engineering and Scientific Research Vol. 4 No. 1 (2022)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (464.216 KB) | DOI: 10.23960/jesr.v4i1.97

Abstract

Gold mineral (Au) is formed due to an increase in the residual solution of magma deposited at high temperature and pressure. This study aims to estimate the potential of gold minerals in the west coast area in Lampung Province. This initiation study was using a geophysical resistivity model. Based on geological data, gold minerals in the West Coast are classified as epithermal hydrothermal deposits in the form of low sulfide quartz veins. The results of the subsurface interpretation were identified as a gold mineralization zone associated with the rock in the form of volcanic rock which has a resistivity value of 400?.m. The source rock volume has been estimated at 130,000 m3 and ?133,000 m3. So that the Au mineral content in the study area is estimated at 0.5-2.09 tons. A future study should be conducted in relation to the development of gold mining industry in Lampung West Coast area, that may integrate more engineering experts.
IDENTIFIKASI LINGKUNGAN PENGENDAPAN BATUAN KARBONAT CEKUNGAN JAWA TIMUR UTARA MENGGUNAKAN ANALISIS ELEKTROFASIES DATA LOG GAMMA-RAY Rahmat Catur Wibowo; Varenza Novita Yandi; Ordas Dewanto; Syamsurijal Rasimeng
Jurnal Geosaintek Vol 9, No 1 (2023)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25023659.v9i1.12628

Abstract

Dalam mengembangkan lapangan produksi minyak dan gas, perlu dilakukan studi lingkungan pengendapan untuk dapat meningkatkan kualitas hasil produksi. Cekungan Jawa Timur Utara sebagian besar merupakan cekungan lepas pantai yang menghasilkan minyak dan gas dengan shale Formasi Ngimbang sebagai batuan induk yang menggenerasikan hidrokarbon ke reservoir berupa batuan karbonat (Formasi Kujung).  Identifikasi lingkungan pengendapan yang dilakukan dengan menganalisa pola kurva log Gamma-Ray (GR) disebut sebagai analisis elektrofasies. Penelitian ini bertujuan untuk menganalisa lingkungan pengendapan batuan reservoir karbonat berdasarkan pola yang terbentuk pada log GR. Pola log GR memiliki karakter khusus yang berhubungan dengan pola pengendapan batuan karbonat dan kemudian dihubungkan dengan data biostratigrafi sebagai justifikasi. Dengan menggunakan 3 sumur, didapati adanya pola elektrofasies berupa cylindrical dan funnel yang mengindikasikan tubuh karbonat yang terbentuk berupa keep-up carbonate dan catch-up carbonate yang terendapkan pada lingkungan laut dangkal. Adanya indikator organisme lingkungan laut dangkal seperti microgastropods, byrozoa, dan fragmen cangkang pada data biostratigrafi, mendukung interpretasi elektrofasies berupa lingkungan pengendapan karbonat daerah penelitian terendapkan di lingkungan laut dangkal.
Advanced Processing of 2D Marine Reflection Seismic Data Using the Common Reflection Surface (CRS) Stack Method with K-L Filter Application: Pengolahan Lanjut Data Seismik Refleksi 2D Lait Menggunakan Metode Common Reflection Surface (CRS) Stack dengan Penerapan KL-Filter Emir Dzakwan Kamal Zein; Syamsurijal Rasimeng; Egie Wijaksono
JURNAL GEOCELEBES Vol. 7 No. 2: October 2023
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/geocelebes.v7i2.22588

Abstract

Data processing using the seismic reflection method is an important stage in the exploration of natural resources and minerals. This research was conducted to determine the effective and efficient stacking and filtering methods in reconstructing the subsurface geological structure of the earth from the results of data processing using ProMAX software. The data processing method used is the conventional stack and the Common Reflection Surface (CRS) stack. Aperture values of 0 ms – 50 m and 3000 ms – 150 m in the CRS stack process produce the most optimum seismic sections. Both methods produce a different quality of seismic cross-section display. The 2D cross-section model from the conventional stack method looks noisier than the results from the CRS stack method. In addition, the reflector pattern on the cross-section of the results of the CRS stack method is clearer and visible with a relatively large amplitude compared to the results of the conventional stack method. To maximize the quality of data display, data enhancement is applied, which is the K-L filter. The eigenimages value of 0.10% on the K-L filter with a horizontal window width of 120 is used to reduce random noise. Thus, an increase in the S/N ratio will be obtained in the seismic data so that the 2D cross-sectional model of the seismic reflection method can approach the original conditions of the subsurface geological structure.
Seismic Site Classification Using the Multichannel Analysis of Surface Waves Method Syamsuddin, Erfan; Aswad, Sabrianto; Assegaf, Muhammad Alimuddin Hamzah; Rasimeng, Syamsurijal; Sakka, Sakka; Syamsuddin, Syamsuddin; Nasri, Muhammad; Syihab, Mufly Fadla
POSITRON Vol 12, No 2 (2022): Vol. 12 No. 2 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/positron.v12i2.53869

Abstract

The soil has a variety of qualities that affect its ability to support the weight of a structure. One of these features is soil stiffness, which can be determined using the surface wave method to prevent soil collapse. Multichannel Analysis of Surface Waves (MASW) is one of the non-invasive methodologies used in this study to investigate subsurface structures in North Sumatra, Indonesia. This method utilizes the dispersion properties of Rayleigh waves, producing a dispersion curve to get the shear wave velocity (Vs) through inversion. The shear wave velocity can be used to examine the soil stiffness qualities. The dispersion curve explains the relationship between shear wave velocity and depth, which can subsequently be used as a site class parameter. This survey uses three lines with one shot for each line which uses thirty geophones. The seismic source used is a gun with the type M16.38 Cal. Each line consists of 30 geophones with a distance of 5 m. The entire track is 160 m long and lasts for 2048 seconds with a sampling rate of 0.00025 seconds. The average shear wave velocity measured at three measurements was 372.5 m/s on line P1, 347.1 m/s on line P2A, and 311.0 m/s on line P2B, respectively. Overall, the soil classification on the P1 line is class C, and the P2A and P2B lines are class D, which is suitable for development planning areas.
Fractal Dimension Analysis and Earthquake Repeated Period Estimation in the Southern Part of Sumatra Subduction Zone (Bengkulu-Lampung-Sunda Segment) Syamsurijal Rasimeng; Masdar Helmi; Tugiyono Tugiyono; Suharno Suharno
Indonesian Journal on Geoscience Vol. 9 No. 3 (2022)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.9.3.383-394

Abstract

DOI:10.17014/ijog.9.3.383-394An earthquake seismicity parameter study has been conducted in the southern part of the Sumatra Subduction Zone (SSZ) for the period of 1919 to 2019 with a hypocentre depth of 120 km and magnitude of ≥4Mw. The researched area is divided into three segments, Bengkulu, Lampung, and Sunda segments, respectively. This study aims to evaluate the seismicity parameters in the form of a-value, b-value, fractal dimension, and probabilities of earthquake recurrence period. Frequency-magnitude correlation statistical approach introduced by Gutenberg-Richter was used to calculate the seismicity parameters based on catalogue data obtained from USGS. An a-value variation of 5.11±1.84 to 5.85±2.46 obtained indicates the most dominant seismic intensity. b-value of 0.69±0,.17 to 0.83±0.35 correlates with high-stress levels, the level of spatial heterogeneity on the SFZ, and the probabilities of bigger earthquakes in the future. The calculation of fractal dimension of 1.4±0.33 to 1.7±0.71 indicates an earthquake distribution pattern was caused by a single fracture zone along the southern part of SSZ. The fracture zone is located on the left and right sides of the southern part of SSZ, which may not have been connected. In addition, the calculation result of earthquake recurrence period with magnitude ≥6.5Mw indicates that there will be an 5 - 6 earthquake event in the Bengkulu segment, 2 - 3 event in the Lampung segment, and 1 - 2 event in the Sunda segment, while the probabilities of an earthquake with magnitude ≥7.5Mw along the southern part of SSZ is 1 - 2 times.
The Efektivitas Metode Peter Half Slope dalam Menentukan Kedalaman Benda Anomali Syamsurijal Rasimeng; Ivana Jayarani; Maria Nova NafTalita; Tiara Andika Fadila; Ilham Dani; Rustadi
Jurnal Rekayasa Geofisika Indonesia Vol. 5 No. 03 (2023): Edisi Desember Jurnal Rekayasa Geofisika Indonesia (JRGI)
Publisher : Program Studi Teknik Geofisika FITK UHO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/jrgi.v5i03.7

Abstract

The Peter Half Slope method is one of several techniques that can be used as the earliest quantitative depth determination. It is hoped that through this research the literature on the Peter Half Slope method can increase. This research aim is to prove the effectiveness of the Peter Half Slope method in estimating the depth of subsurface anomalous objects through comparison of models (synthesis) that have not and have been added random values as error values. This research begins with modeling in Geomodel software. After obtaining the appropriate synthetic modeling results, the next step is to perform processing in Matlab software to test the effectiveness of the Peter Half Slope method. After entering all the values, the average value of the anomalous depth of model 1 in d1, d2, and d3 is 100.1890m. As for model 2, the average value of model 2 anomaly depth is 97.35344m. The error between the original modeling and the modeling added random values using the Peter Half Slope method is 2.83%. Thus, this method is considered effective in determining the depth of subsurface anomalies through magnetic response, but to determine the exact depth requires the use of other methods as the main method.
TEKNIK PEMISAHAN ANOMALI MAGNETIK RESIDUAL-REGIONAL BERBASIS MATLAB: STUDI KASUS GUNUNG UNGARAN Syamsurijal Rasimeng; Dewi Wijayanti; Luthfi Rahmawati; Annur Istikomah; Rahmat Catur Wibowo
Jurnal Geosaintek Vol 10, No 1 (2024)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25023659.v10i1.18572

Abstract

Penelitian ini menggunakan data pengukuran magnetic di daerah Gunung Ungaran, Kabupaten Semarang, Provinsi Jawa Tengah. Tujuan dari penelitian ini membandingkan teknik inversi dengan persamaan polynomial orde 1, orde 2 dan orde 3 dalam pemisahan anomali residual dengan anomali regional.  Pada penelitian ini dilakukan kajian komputasi dengan membuat program komputer menggunakan software MatLab 2017. Data pengukuran magnetic yang digunakan merupakan data yang telah dilakukan koreksi sehingga telah didapatkan nilai anomali totalnya. Pemisahan anomali residual-regional ini selanjutnya akan disesuaikan dengan kondisi geologi sekitar daerah penelitian. Sebelumnya, telah dilakukan pemodelan kedepan (forward modeling) untuk memunculkan model sintetik pada perhitungan orde 1, orde 2 dan orde 3. Hasil forward modeling ini akan disesuaikan dengan model anomali regional yang muncul setelah diinversi. Setelah dilakukan pemisahan anomali residual-regional, selanjutnya adalah menyesuaikan antara kontur dan nilai anomali regional dengan keadaan geologi sekitar daerah penelitian. Gunung Ungaran merupakan bagian dari Pengunungan Serayu Utara yang berada pada bagian tengah Pola Jawa yang mana pada pola ini terdapat sesar naik dari arah Barat ke Timur. Dari hasil penyesuaian antara anomali regional orde 1, orde 2 dan orde 3 dengan kondisi geologi daerah sekitar didapatkan bahwa pada penelitian ini perhitungan inversi dengan orde 2 menunjukkan hasil pemisahan anomali yang paling sesuai.
ANALISIS SPEKTRUM DATA GAYABERAT GGMPLUS DAERAH WAYRATAI, LAMPUNG Syamsurijal Rasimeng; Ilham Dani; Widya Putri Syahranti; Ivana Jayarani Sitompul; Fadhil Muhammad Nizam
Gravity : Jurnal Ilmiah Penelitian dan Pembelajaran Fisika Vol 10 No 1 (2024)
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30870/gravity.v10i1.23575

Abstract

The weight force method is a geophysical method that is sensitive to vertical changes, therefore this method is favored for studying intrusion contacts, bedrock, geological structures, ancient river deposits, holes in the rock mass, buried shaff, and others. The location of the research area is in the Way Ratai geothermal area, Padang Cermin District, Pesawaran Regency, Lampung Province. This research aims to determine the depth of regional and residual anomalies and to identify weight force anomalies based on 2-dimensional subsurface conditions. Five passes were sliced, namely A-A', B-B', C-C', D-D', and E-E' on the complete Bouguer anomaly cross section, and the resulting values of regional depth, residual, wavelength, and cutoff value as the boundary of the intersection between regional and residual anomalies. The complete Bouguer anomaly values range from 54 mGal to 100 mGal, the regional anomaly is 56 mGal to 90 mGal, and the residual anomaly is 19 mGal to 4 mGal. The depth of the regional anomaly is 5219.4m and the residual anomaly is at a depth of 336.77m.
Co-Authors Achmad Subari Aisah Yuliantina Akroma Hidayatika Ambrosius Hernawan Wibisono Amelia Isti Ekarena Andrian Wilyan Djaja Annur Istikomah Aprillia Yulianata Arief Putih Prabowo Arif P Prabowo Arif P Prabowo Arsy Nurrochman Assegaf, Muhammad Alimuddin Hamzah Ayu Safira, Ayu Azis Riyanti Bagus Sapto Mulyanto Dani, Ilham Dewi Wijayanti Dewi Wijayanti Dewi, Soraya Tiana Egie Wijaksono Eko Rananda Elen Novia Limswipin Emir Dzakwan Kamal Zein F Alami Fadhil Muhammad Nizam Fahruddin Fahruddin Farrasha, Muthia Firda Amalia Gita Purna Rae Wanudya Gusti Aldy Haqqie Ramadhan Hesti Hesti Hidayat Hidayat Hilman Sabiq Ibrahim Ibrahim Ida Bagus Suananda Yogi Ida Bagus Suananda Yogi Ida Bagus Sunanda Yogi Idabagus S Yogi Iis Ratna Sari Ilham Dani Ilham Dani Istikomah, Annur Ivana Jayarani Ivana Jayarani Sitompul K Karyanto Karyanto, Karyanto La Ode Safiuddin La Ode Safiuddin Ledia Damayanti Lintang Prabowo Luthfi Rahmawati Maria Nova NafTalita Masdar Helmi Medi K Putri Mhd Azri Pangaribuan Muhammad Fikri Azhari Muhammad Nasri Muhammad Nurul Muhammad Rasyid Ridho Mustaid Yusuf Nandi Haerudin Nando Liven Konstanta Noor Muhammad Indragiri Nurlina Nurlina Ordas Dewanto Ordas Dewanto, Ordas PM Haidar Pratama, Tectona Putra Epriyan Rahmat C Wibowo Rahmawati, Luthfi Rahmi Mulyasari Ramadhan, Haqqie RC Wibowo Restu Wildanu Ahadi Ririn Yulianti Rudianto Rudianto Rustadi ., Rustadi Rustadi Rustadi S Suharno Sabrianto Aswad, Sabrianto Sakka Sakka Sari, Iis Ratna Sianturi, Rizky J. Soulthan Salahudin Al Ayubi Subarsyah Subarsyah Sudarningsih Sudarningsih Suharno Suharno Suharno Suharno Suharno Sultan Al Ghifari Supardi . Supardi Supardi Surbakti, Lucky Dolinta Syamsuddin Syamsuddin Syamsuddin, Erfan Syihab, Mufly Fadla Tiara Andika Fadila Tugiyono Tugiyono Ulfa Wahyuningsih Valentino Manurung, Andro Varenza Novita Yandi Wibowo, Rahmat Catur Widya Putri Syahranti Wijaksono, Egie Winda Styani Yuliawati Yandi, Varenza Novita Yeri, Nazhifah Ananda Yoga Kurniawan Yogi, Sunanda Zein, Emir Dzakwan Kamal