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All Journal IJOG : Indonesian Journal on Geoscience INDONESIAN JOURNAL OF APPLIED PHYSICS Jurnal Geofisika Prosiding SEMNAS INOTEK (Seminar Nasional Inovasi Teknologi)
Satria Bijaksana
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Astronomy Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Transportation

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Integrated Prediction Error Filter Analysis Application On Lake Towuti Taufik, M; Winardhi, Ignatius Sonny; Bijaksana, Satria
Jurnal Geofisika Vol 17 No 2 (2019): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36435/jgf.v17i2.415

Abstract

Every naturally-occurred phenomenon on earth is related to cyclicity. On a larger scale, it can be defined as the occurrence of climate periodicity which is caused by the revolution of earth towards the sun. It can also be examined on a smaller process such as the days and nights cycles, as the effect of earths rotation. This research will specifically discuss about the cyclicity of grain size changes in sediments from lake Towuti, Indonesia. The cyclicity of the sediments is deduced using Integrated Prediction Error Filter Analysis (INPEFA) trends. The INPEFA trends are used to analyse the probability of sediments distribution by simply calculating the cumulative errors between predicted and actual data. Unlike any other implementation of INPEFA that mainly observing lithology controlled by sea level changes, this research is aimed at applying INPEFA to enhance well correlation process across an area that is strongly influenced by rainfall intensity and some climatically-driven processes. By correlating the sediment units, the lateral distribution of the climatically-driven diatom ooze will eventually help a better understanding of paleoclimate events on lake Towuti. This research is aimed at constructing and applying systematic algorithm on INPEFA logs calcultation. Two main cores that construct the INPEFA calculation are trend removal process and autoregressive coefficients calculation using Burgs method. When dealing with real datasets the trend removal process is an imperative process to prevent ambiguous INPEFA trend. Moreover, the use of trend removal process is also favourable in interpreting INPEFA trends for various cyclicity periods, this is achieved by varying the input parameters on the trend removal process. Autoregressive coefficients calculation on the other hand is the keystone that constructs the INPEFA logs calculation process. Well correlations process is successfully achieved through interpreting the INPEFA trends logs. Validation of the INPEFA logs shows good correlation between the result and core sample from lake Towuti with widely-distributed tephra being the main key validator. The changes in INPEFA trends is interpreted to be linked with the change in grain size and also in sediments impedance. Comparing and validating the INPEFA trends with two seismic traces from the lake reveals that the turning point of INPEFA trends are associated with strong reflection on the seismic traces. We approach the building of pseudo-INPEFA section through applying optimum Wiener filter (OWF) during the multi-attribures analysis. The lateral continuation of predicted pseudo-log was improved, overall correlation showed an increase by 15% and a decreased in error value by 25%.
Magnetic Basement Depth from Marine Magnetic Data in Cendrawasih Bay Hydrocarbon Prospect Area, Bird Head, Papua, Indonesia Ibrahim, Khalil; Kawab, Gracia Abigail Paraskah; Bijaksana, Satria; Fajar, Silvia Jannatul; Sapiie, Benyamin; Ngkoimani, La Ode; Suryanata, Putu Billy; Harlianti, Ulvienin; Kurniawan, Syaiful Apri; Wibisono, Salsabila Nadhifa
Indonesian Journal on Geoscience Vol. 12 No. 3 (2025)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.12.3.383-400

Abstract

The magnetic basement and structural segmentation of the eastern Bird Head region, Papua, were investigated using marine magnetic data and frequency-domain inversion (MagB_Inv). The studied area includes The Cendrawasih and Yapen–Biak Basins, both were influenced by the Yapen strike-slip fault and transtensional tectonics. Processing involved reducing to the pole, spectral depth estimation, and 3D magnetic inversion to delineate basement geometry, and to infer the sediment thickness. Three structurally bounded subbasins were identified: (1) between Cendrawasih Bay and Num Island, (2) between Cendrawasih Bay and Yapen Island, and (3) between Yapen and Biak Islands. These subbasins exhibit magnetic basement depths ranging from 0.4 to 7 km and sediment thicknesses exceeding 3 km. Magnetic highs around Yapen Island correlate with Miocene volcanic and ultramafic outcrops, interpreted as shallow high-magnetization crustal blocks. The subbasins are bounded by ridges and faults, including the Yapen Fault Zone and fold-thrust systems, which deform both basement and sedimentary cover. The basement morphology controls sediment distribution, and defines fault-bound sedimentary zones, consistent with regional tectonic trends. Seismic cross-sections and shallow earthquake hypocentres, and further supports this structural segmentation. These results provide a structural framework to understand the basin structure, and to support preliminary hydrocarbon evaluations in this underexplored region. Despite these insights, interpretations are constrained by the non-uniqueness of magnetic inversion prosess and the absence of well and high-resolution seismic data.
Pemilihan Calon Peserta OSN Menggunakan Metode WP dan AHP di SMP Negeri 1 Banyakan Bijaksana, Satria; Farida, Intan Nur; Sahertian, Julian
Prosiding SEMNAS INOTEK (Seminar Nasional Inovasi Teknologi) Vol. 7 No. 2 (2023): PROSIDING SEMINAR NASIONAL INOVASI TEKNOLOGI TAHUN 2023
Publisher : Universitas Nusantara PGRI Kediri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29407/inotek.v7i2.3511

Abstract

Olimpiade Sains Nasional (OSN) diadakan setiap tahun untuk meningkatkan kemampuan berpikir kritis dan kreatif siswa di bidang sains dan teknologi serta untuk mendorong pembelajaran sains di sekolah. Proses seleksi calon peserta OSN melalui seleksi siswa tidak mudah karena sekolah harus mengidentifikasi calon peserta OSN untuk setiap mata pelajaran. Oleh karena itu perlu diterapkan suatu sistem pendukung keputusan untuk menyeleksi calon peserta OSN dengan menggunakan metode WP dan AHP untuk mempermudah penyeleksian calon peserta OSN. Dengan menggunakan metode WP dan AHP, kriteria poin mata pelajaran (terdiri dari 3 mata pelajaran) digunakan untuk menyeleksi siswa untuk OSN. Dengan hasil yang diperoleh dengan metode WP dan AHP, sekolah dapat secara efektif merekomendasikan calon peserta OSN karena tidak perlu memilih siswa satu per satu.
Scanning Electron Microscopy and Magnetic Characterization of Iron Oxides in Suspended Sediments Sudarningsih, Sudarningsih; Bijaksana, Satria; Widodo, Widodo; Iskandar, Irwan; Dahrin, Darharta; Fajar, Silvia Jannatul; Kirana, Kartika Hajar; Yunginger, Raghel
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 14, No 2 (2024): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v14i2.76582

Abstract

River sediment is the product of a sedimentation process in the river environment that originates from the weathering of bedrock or erosion processes, organic materials, particles, or anthropogenic substances. Previous research shows the magnetic mineral content in the sediments of the Citarum River and its tributaries. Suspended sediment was collected from the Citarum River and its tributaries in West Java, Indonesia, for mineralogical and granulometric analysis. The aim of this research is to distinguish between magnetic mineral sources, a scanning electron microscope equipped with energy dispersive X-ray spectroscopy (SEM-EDX), and rock magnetism. The hysteresis parameter verifies that the XRD measurement results show that the main magnetic minerals in suspended sediments are ferrimagnetic minerals such as magnetite (Fe3O4). According to the results of the SEM-EDX investigations, the magnetic granules in the Citarum River and its tributaries derive from two distinct sources: pedogenic and anthropogenic. The Citarum River and its tributaries’ magnetic granules are generally octahedral or angular in shape, with broken corners, indicating a pedogenic origin
Co-Authors Benyamin Sapiie Darharta Dahrin Fajar, Silvia Jannatul Harlianti, Ulvienin Ibrahim, Khalil Intan Nur Farida Irwan Irwan Julian Sahertian Kartika Hajar Kirana Kawab, Gracia Abigail Paraskah Kurniawan, Syaiful Apri La Ode Ngkoimani, La Ode M Taufik Sudarningsih Sudarningsih Suryanata, Putu Billy Wibisono, Salsabila Nadhifa Widodo Widodo Winardhi, Ignatius Sonny