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ANALISIS KEAKURATAN SOLUSI CENTROID MOMENT-TENSOR (CMT) PADA JOKO TINGKIR MENGGUNAKAN METODE MEAN ABSOLUTE ERROR (MAE) DAN SUDUT KAGAN DI WILAYAH JAWA TIMUR Novalianto, Muhammad Ramdhani; Madlazim, Madlazim; Realita, Arie
Inovasi Fisika Indonesia Vol. 14 No. 2 (2025): Vol 14 No 2
Publisher : Prodi Fisika FMIPA Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ifi.v14n2.p243-252

Abstrak Wilayah Jawa Timur merupakan kawasan aktif secara tektonik yang rawan terjadi gempa bumi. Untuk menunjang mitigasi bencana, diperlukan pemahaman yang akurat terhadap mekanisme sumber gempa. Penelitian ini bertujuan untuk mengevaluasi kualitas solusi Centroid Moment-Tensor (CMT) dari sistem Joko Tingkir dengan membandingkannya terhadap solusi dari GlobalCMT. Metode yang digunakan mencakup Mean Absolute Error (MAE) untuk menilai selisih absolut parameter mekanisme sumber (strike, dip, rake) dan sudut Kagan untuk mengukur kesesuaian orientasi bidang patahan. Hasil menunjukkan bahwa nilai MAE masing-masing adalah 64,5° (strike), 14,00° (dip), dan 27,17° (rake). Sementara itu, sudut Kagan berada dalam rentang 2,066° hingga 22,814°, yang masih di bawah ambang batas toleransi 60°. Temuan ini menunjukkan bahwa solusi CMT dari Joko Tingkir cukup konsisten dengan GlobalCMT dan dapat dijadikan referensi awal dalam analisis mekanisme gempa bumi di Jawa Timur. Abstract East Java is one of Indonesia’s tectonically active regions with high seismic risk. To support disaster mitigation, accurate understanding of earthquake source mechanisms is essential. This study aims to assess the accuracy of Centroid Moment Tensor (CMT) solutions generated by Joko Tingkir software by comparing them with GlobalCMT solutions. The Mean Absolute Error (MAE) method was employed to evaluate absolute differences in strike, dip, and rake parameters, while Kagan angle was used to assess the consistency of fault plane orientation. The results show MAE values of 64.5° for strike, 14.00° for dip, and 27.17° for rake. The Kagan angles ranged from 2.066° to 22.814°, well below the 60° tolerance threshold. These findings indicate that Joko Tingkir’s CMT solutions are sufficiently accurate and consistent with GlobalCMT data for preliminary earthquake source mechanism estimation in East Java.

Analisis Keakuratan Katalog Data Gempa Bumi Indonesia pada Software Joko Tingkir terhadap Global Centroid Moment Tensor (GCMT) menggunakan Uji-T Berpasangan, Wilcoxon, dan Sudut Kagan Dewanti, Adek Putri; Madlazim, Madlazim; Fahmi, Muhammad Nurul
Inovasi Fisika Indonesia Vol. 14 No. 2 (2025): Vol 14 No 2
Publisher : Prodi Fisika FMIPA Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ifi.v14n2.p178-201

Abstrak Penelitian ini dilakukan dengan tujuan untuk menganalisis keakuratan focal mechanism yang dihasilkan software Joko Tingkir terhadap GCMT dengan perhitungan sudut Kagan dan menganalisis keakuratan data katalog Joko Tingkir terhadap GCMT melalui perhitungan uji-t berpasangan dan Wilcoxon ditinjau dari hipotesis yang telah ditetapkan. Data yang diuji memiliki magnitudo momen ≥ 5,0 selama periode 2020-2024 dengan lima daerah penelitian yaitu daerah Jawa, Sumatera, Sulawesi, Maluku, Nusa Tenggara, dan Papua. Parameter yang diuji diantaranya waktu kejadian (origin time), kedalaman, longitude, latitude, dan focal mechanism diantaranya strike, dip, rake. Seluruh data gempa memiliki karakteristik gempa bumi tektonik atau presentase komponen Double Couple (DC) lebih dominan. Hasil perhitungan sudut Kagan dari 50 data uji menunjukkan tidak ada yang mencapai batas 60° sebagaimana dikemukakan oleh Kagan (1991). Nilai ini mengindikasikan bahwa focal mechanism dan bentuk beachball yang dihasilkan oleh software Joko Tingkir relatif sesuai dan homogen terhadap GCMT. Selain itu, nilai-t dari hasil uji-t berpasangan pada parameter kedalaman (-0,88), dip (1,64), dan longitude (-1,23) tidak ada yang mencapai nilai-t kritis . Begitupula untuk nilai z-score dari Wilcoxon pada parameter magnitudo momen (-1,46), strike (-0,25), rake (-0,69) dan latitude (-0,32) tidak ada yang mencapai nilai-z kritis . Dapat disimpulkan bahwa semua parameter peneilitian tidak memiliki perbedaan signifikan antara data katalog Joko Tingir terhadap GCMT. Abstract This study was conducted with the aim of analyzing the accuracy of focal mechanisms produced by the Joko Tingkir software compared to GCMT using Kagan angle calculations, as well as assessing the accuracy of the Joko Tingkir catalog data against GCMT through paired t-test and Wilcoxon test calculations based on the established hypotheses. The tested data consist of earthquakes with a moment magnitude ≥ 5.0 during the 2020–2024 period across five study regions: Java, Sumatra, Sulawesi, Maluku, Nusa Tenggara, and Papua. The parameters analyzed include origin time, depth, longitude, latitude, and focal mechanism parameters such as strike, dip, and rake. All tested earthquakes exhibit tectonic characteristics or a dominant Double Couple (DC) component. The Kagan angle results from 50 test data points showed that none exceeded the 60° threshold as stated by Kagan (1991). This indicates that the focal mechanisms and beachball diagrams generated by the Joko Tingkir software are relatively consistent and homogeneous with those of GCMT. In addition, the t-values from the paired t-test for the parameters of depth (-0.88), dip (1.64), and longitude (-1.23) did not reach the critical t-value of ±2.01. Similarly, the z-scores from the Wilcoxon test for the parameters of moment magnitude (-1.46), strike (-0.25), rake (-0.69), and latitude (-0.32) did not reach the critical z-value of ±1.96. It can be concluded that none of the parameters in this study showed significant differences between the Joko Tingkir catalog data and GCMT.

DETERMINATION OF RUPTURE DIRECTIVITY USING THE LEVENBERG-MARQUARDT ALGORITHM: A CASE STUDY PHILIPPINE EARTHQUAKE (15 DECEMBER 2019 M_w 6.8) Fahmi, Muhammad Nurul; Sungkono, Sungkono; Madlazim, Madlazim
Indonesian Physical Review Vol. 6 No. 1 (2023)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v6i1.199

Earthquake source mechanisms are used to determine local geological characteristics and hazard mitigation. There are several approaches to determine the mechanism of earthquake. In this paper, the relative time of the rupture duration is applied to determine rupture directivity. In determining rupture directivity, the Levenberg-Marquardt (LM) method is proposed to solve the inversion problem. To test the reliability of this method, teleseismic data with an epicentral distance of 40o from the Philippine earthquake on 15 December 2019 Â 6.8, which had a good seismic station distribution with a total of 35 stations, is used. Telesismic data from each station is filtered in the range of 0.25 to 1 Hz to obtain an accurate rupture duration. Furthermore, the rupture duration data set was inverted using the LM method to obtain the direction of earthquake rupture. The results obtained by the curve fitting using the LM method had a good agreement between the observed data and the calculated data. From the curve fitting results, the rupture propagated in the NW direction with azimuth 320.60o Â± 2.30o, and this had the same results from previous studies. Therefore, from rupture directivity, the actual fault plane of this earthquake was NP1 which had a strike/dip/rake value of 321o/75o/13o, respectively. The results indicate that the Philippines earthquake of 15 December 2019 had the SE-NW fault orientation, which is part of the Cotabato fault system. The implication of this research is for a preliminary study related to the characteristics of earthquake rupture in areas that have a high level of seismicity. Thus, local residents can avoid areas where ruptures propagate when carrying out earthquake mitigation.

Profile of High School Student’s Scientific Literacy to Support SDGs’13 (Climate Action) on the Global Warming Phenomenon Lestari, Nurita Apridiana; Pratiwi, Winda; Uulaa, Rizki Fitri Rahima; Hariyono, Eko; Madlazim, Madlazim
Tarbiyah : Jurnal Ilmiah Kependidikan Vol. 13 No. 2 (2024): December
Publisher : Universitas Islam Negeri Antasari Banjarmasin, South Kalimantan, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18592/tarbiyah.v13i2.13787

The low level of scientific literacy skills is attributed to the lack of application of scientific literacy principles, the inability to interpret tables and graphs, and students' limited understanding of basic scientific concepts related to the SDGs'13. This research aims to analyze the scientific literacy abilities of 10th-grade students at SMAN 1 Surabaya in relation to supporting SDGs'13 on the Global Warming Phenomenon. The research method used is descriptive and mixed method approach. The research design involves an explanatory sequential design. The research findings indicate that the average score of 10th grade students at SMAN 1 Surabaya is 65.2, which falls within the satisfactory category. Factors contributing to the suboptimal scientific literacy abilities include the inadequate application of scientific literacy competencies in teaching, teacher’s not to familiarize students with scientific analysis of phenomena, and the continued use of conventional teaching methods. There is a lack of experimental activities that encourage students to engage with scientific data and produce experimental reports. Therefore, there is a need for innovative learning methods and tools, such as integrating the topic of global warming with the SDGs'13 climate action concept and implementing a problem based learning model. These approaches aim to foster critical thinking and environmental awareness among students, enabling them to address global issues and contribute to environmental preservation in the face of climate change. Ultimately, the goal is to ensure that knowledge about preventing climate change can be applied by students in their daily lives in the long term.

Inquiry-based Physics Learning Integrated with Mobile Apps, Multiple Intelligences, and Local Wisdom: A Bibliometric Analysis of Research Trends and Scientific Literacy Implications Alhusni, Hanan Zaki; Prahani, Binar Kurnia; Sunarti, Titin; Madlazim, Madlazim; Kurtulus, Muhammed Akif
Jurnal Penelitian dan Pengkajian Ilmu Pendidikan: e-Saintika Vol. 10 No. 1 (2026): March
Publisher : Lembaga Penelitian dan Pemberdayaan Masyarakat (LITPAM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/e-saintika.v10i1.3967

This bibliometric study maps and evaluates the publication landscape on inquiry-based physics learning that intersects with mobile applications, multiple intelligences (MI), and local wisdom, with attention to implications for scientific literacy. Scopus records were retrieved using a TITLE-ABS-KEY search and processed following PRISMA 2020 and PRISMA-S. The screening window was restricted to 2020–2025, English-language, final-status documents, and journal articles or conference papers/proceedings. From 138,162 initially identified records, 362 remained after year and subject filtering; 305 met eligibility criteria, and 99 unique documents were included after DOI/title deduplication (full flow and exclusion reasons are reported in the PRISMA diagram and accompanying table). Performance analysis (annual output, sources, authors, countries, and subject areas) and science mapping (co-authorship, keyword co-occurrence, co-citation, and bibliographic coupling) were conducted using Bibliometrix/Biblioshiny and visualized in VOSviewer with association-strength normalization and full versus fractional counting sensitivity checks. Results show a publication peak in 2020, a decline across 2021–2023, and a rebound in 2024. Conference proceedings dominate the corpus (≈91%), with Journal of Physics: Conference Series contributing nearly two-thirds of documents. Indonesia is the leading contributor by affiliation and country; Physics and Astronomy accounts for ≈48–49% of subject assignments, followed by Engineering (≈14%) and Computer Science (≈12%). Keyword networks center on “students” and “education computing,” while MI and scientific literacy occur infrequently and local wisdom appears peripheral, indicating an early-stage, technology-driven field. Limitation: the Physics subject-area filter likely underrepresents education-journal studies where MI and literacy are more explicitly operationalized. Future work should prioritize journal-level designs, validated scientific-literacy measures, and transparent term normalization and counting schemes.

Inquiry-based Physics Learning Integrated with Mobile Apps, Multiple Intelligences, and Local Wisdom: A Bibliometric Analysis of Research Trends and Scientific Literacy Implications Alhusni, Hanan Zaki; Prahani, Binar Kurnia; Sunarti, Titin; Madlazim, Madlazim; Kurtulus, Muhammed Akif
Jurnal Penelitian dan Pengkajian Ilmu Pendidikan: e-Saintika Vol. 10 No. 1 (2026): March
Publisher : Lembaga Penelitian dan Pemberdayaan Masyarakat (LITPAM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/e-saintika.v10i1.3967

This bibliometric study maps and evaluates the publication landscape on inquiry-based physics learning that intersects with mobile applications, multiple intelligences (MI), and local wisdom, with attention to implications for scientific literacy. Scopus records were retrieved using a TITLE-ABS-KEY search and processed following PRISMA 2020 and PRISMA-S. The screening window was restricted to 2020–2025, English-language, final-status documents, and journal articles or conference papers/proceedings. From 138,162 initially identified records, 362 remained after year and subject filtering; 305 met eligibility criteria, and 99 unique documents were included after DOI/title deduplication (full flow and exclusion reasons are reported in the PRISMA diagram and accompanying table). Performance analysis (annual output, sources, authors, countries, and subject areas) and science mapping (co-authorship, keyword co-occurrence, co-citation, and bibliographic coupling) were conducted using Bibliometrix/Biblioshiny and visualized in VOSviewer with association-strength normalization and full versus fractional counting sensitivity checks. Results show a publication peak in 2020, a decline across 2021–2023, and a rebound in 2024. Conference proceedings dominate the corpus (≈91%), with Journal of Physics: Conference Series contributing nearly two-thirds of documents. Indonesia is the leading contributor by affiliation and country; Physics and Astronomy accounts for ≈48–49% of subject assignments, followed by Engineering (≈14%) and Computer Science (≈12%). Keyword networks center on “students” and “education computing,” while MI and scientific literacy occur infrequently and local wisdom appears peripheral, indicating an early-stage, technology-driven field. Limitation: the Physics subject-area filter likely underrepresents education-journal studies where MI and literacy are more explicitly operationalized. Future work should prioritize journal-level designs, validated scientific-literacy measures, and transparent term normalization and counting schemes.

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