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Inovasi Fisika Indonesia (IFI)
Published by Universitas Negeri Surabaya
ISSN : 23024216     EISSN : 28301765     DOI : https://doi.org/10.26740/ifi
Core Subject : Science, Engineering,
Earth & Planetary Sciences Electrical & Electronics Engineering Materials Science & Nanotechnology Physics
Jurnal Inovasi Fisika Indonesia(IFI) is a peer-reviewed journal, ISSN: 2302-4216, which is managed and published by the Department of Physics, Faculty of Mathematics and Natural Sciences (FMIPA) Universitas Negeri Surabaya (UNESA). This journal is accessible to all readers and covers developments and research in physics (Materials Physics, Earth Physics and Instrumentation Physics).
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 438 Documents
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ANALYSIS OF THE EFFECTIVENESS OF METAL COVER IN PREVENTING RADIATION LEAKAGE IN MICROWAVE-BASED GASIFICATION REACTOR Rahayu, Vira; Ratnasari, Tri; Rahmatullah, Muhammad Arif; Pramono, Yono Hadi; Yudoyono, Gatut
Inovasi Fisika Indonesia Vol. 14 No. 3 (2025): Vol 14 No 3
Publisher : Prodi Fisika FMIPA Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ifi.v14n3.p404-411

Abstract

Abstract Microwave-assisted gasification, which converts biomass and plastic waste into syngas, has significant promise for the production of clean renewable energy. This technology has the potential to reduce reliance on fossil fuels and address waste management challenges. Operational safety, particularly with microwave leakage, is a significant issue due to stringent standards for microwave exposure. This study evaluates the effectiveness of several metallic materials as microwave shields in microwave gasification reactors. This study investigates the effectiveness of 2 mm thick metal sheets made of copper, aluminum, iron, and stainless steel in reducing microwave leakage at a frequency of 2.45 GHz. Experimental results indicated that copper and aluminum are particularly effective shields. Copper attained a remarkable leakage reduction of 99.53% (from 105.6 W/m2  to 0.5  W/m2) while aluminum reached a decrease of 97.35% (from 105.6 W/m2 to 2.8 W/m2). Efficient reflection and absorption of microwave energy are facilitated by the extremely low skin depth values of both materials, which is consistent with their high effectiveness. However, iron and stainless steel also demonstrated a strong capacity to reduce leakage, with an efficacy of 89.96% (reducing leakage to 10.6 W/m2 ) and 73.86% (reducing leakage to 27.6 W/m2). Still, their performance was influenced by more complex magnetic properties. These results indicate that copper and aluminum are ideal choices for primary microwave shielding applications in gasification reactors. Conversely, iron and stainless steel, while less efficient as primary shields, offer excellent mechanical strength and corrosion resistance, making them suitable for auxiliary structural components. Therefore, a hybrid design integrating a thin shielding layer of copper or aluminum onto these structural elements is proposed for optimal microwave containment. This study provides crucial insights for the design of safer and more efficient microwave gasification reactors, thereby supporting the development of responsible renewable energy technologies.
IMPLEMENTASI ALGORITMA KNN UNTUK PENENTUAN JALUR EVAKUASI AMAN BERDASARKAN DATA SHAKEMAP DAN DATA TITIK EVAKUASI DI KABUPATEN MADIUN Chaidar Aria Bayu Pratama; Madlazim; Muhammad Nurul Fahmi
Inovasi Fisika Indonesia Vol. 15 No. 1 (2026): Vol 15 No 1
Publisher : Prodi Fisika FMIPA Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ifi.v15n1.p77-83

Abstract

Abstrak Bencana gempa bumi merupakan ancaman nyata di Indonesia, terutama pada daerah yang berada pada zona seismik aktif seperti Kabupaten Madiun. Penelitian ini memiliki tujuan untuk mengembangkan sistem rekomendasi titik evakuasi aman berbasis algoritma K-Nearest Neighbor (KNN) berdasarkan data intensitas gempa dari ShakeMap  USGS dan distribusi titik evakuasi dari BPBD. Kriteria yang ditetapkan adalah wilayah dengan nilai  Modified Mercalli Intensity (MMI) < 4 dan jarak maksimum 1.000 meter sesuai dengan pedoman BNPB. Pengujian dilakukan terhadap 1.000 titik pengguna simulasi yang tersebar di seluruh wilayah Kabupaten Madiun. KNN berhasil menunjukkan titik evakuasi rekomendasi yang valid sebanyak 370 titik (37.0%), 502 titik (50.2%) ditolak karena melebihi jarak, serta 128 titik (12.8%) gagal karena tidak memiliki titik aman. Temuan ini menunjukkan bahwa KNN efektif untuk mendeteksi awal titik evakuasi, namun keberhasilan KNN bergantung pada distribusi spasial titik evakuasi dan kontur guncangan. Dengan demikian, sistem ini dapat menjadi dasar dalam pengembangan sistem evakuasi berbasis spasial yang responsif dan akurat.   Abstract Earthquakes are a real threat in Indonesia, especially in areas located in active seismic zones such as Madiun Regency. This study aims to develop a safe evacuation point recommendation system based on the K-Nearest Neighbour (KNN) algorithm using earthquake intensity data from the USGS ShakeMap  and evacuation point distribution data from the Regional Disaster Management Agency (BPBD). The criteria set are areas with a Modified Mercalli Intensity (MMI) value < 4 and a maximum distance of 1,000 metres, in accordance with BNPB guidelines. The testing was conducted on 1,000 simulation user points spread across the entire Madiun Regency area. KNN successfully identified 370 valid recommended evacuation points (37.0%), 502 points (50.2%) were rejected due to exceeding the distance limit, and 128 points (12.8%) failed because they did not have safe points. These findings indicate that KNN is effective for detecting initial evacuation points; however, the success of KNN depends on the spatial distribution of evacuation points and earthquake contours. Thus, this system can serve as a foundation for developing a responsive and accurate spatial-based evacuation system.
EFEKTIVITAS PENAMBAHAN rGO PADA KOMPOSIT TiO2/rGO SEBAGAI PENDEGRADASI PEWARNA METHYLENE BLUE DALAM SINAR TAMPAK Aprillia Sinda Dinningrum; Diah Hari Kusumawati
Inovasi Fisika Indonesia Vol. 15 No. 1 (2026): Vol 15 No 1
Publisher : Prodi Fisika FMIPA Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ifi.v15n1.p103-114

Abstract

Abstrak Pencemaran lingkungan akibat pembuangan limbah berwarna seperti methylene blue menjadi perhatian serius karena sifatnya toksik, karsinogenik, dan sulit terurai. Fotokatalis berbasis semikonduktor seperti TiO2 dikenal efektif untuk memecah senyawa kompleks menjadi senyawa yang lebih sederhana, namun memiliki keterbatasan dalam menyerap sinar tampak. Sehingga diperlukan modifikasi TiO2 dengan material rGO yang bertujuan meningkatkan efisiensi degradasi di bawah sinar tampak. Penelitian ini bertujuan menganalisis efektivitas penambahan rGO pada komposit TiO2/rGO sebagai pendegradasi pewarna methylene blue dalam sinar tampak. rGO direduksi dari GO yang disintesis menggunakan metode Hummer’s termodifikasi dari arang kelapa, kemudian dikompositkan dengan TiO2 menggunakan metode hidrotermal autoclave dengan variasi massa rGO 45, 60, 75, 90, dan 105 mg. Selanjutnya dikarakterisasi menggunakan SEM dan UV-Vis. Hasil SEM menunjukkan partikel TiO2 menyelimuti lembaran rGO dengan distribusi partikel pada komposit TiO2/rGO-105 sebesar 214,12 nm. Nilai energy band gap terkecil pada TiO2/rGO-105 sebesar 2,26 eV. Efisiensi degradasi sebesar 99,8% pada menit ke-105. Hasil menunjukkan bahwa penambahan rGO dalam komposit TiO2/rGO dapat meningkatkan efektivitas fotokatalis di bawah sinar tampak.  Abstract Environmental pollution due to the disposal of colored waste such as methylene blue is a serious concern due to its toxic, carcinogenic, and difficult to decompose properties. Semiconductor-based photocatalysts such as TiO2 are known to be effective in decomposing complex compounds into simpler compounds, but have limitations in absorbing visible light. Therefore, modification of TiO2 with rGO material is needed to increase degradation efficiency under visible light. This study aims to analyze the effectiveness of adding rGO to TiO2/rGO composites as a degrader of methylene blue dye in visible light. rGO was reduced from GO synthesized using the modified Hummer's method from coconut charcoal, then composited with TiO2 using the autoclave hydrothermal method with variations in rGO mass of 45, 60, 75, 90, and 105 mg. Furthermore, it was characterized using SEM and UV-Vis. The SEM results showed that TiO2 particles covered the rGO sheets with a particle distribution in the TiO2/rGO-105 composite of 214.12 nm. The smallest energy band gap value in TiO2/rGO-105 is 2.26 eV. The degradation efficiency is 99.8% at the 105th minute. The results show that the addition of rGO in the TiO2/rGO composite can increase the effectiveness of the photocatalyst under visible light. Keywords: Photocatalyst, Methylene Blue, TiO2, GO, rGO, Hydrothermal Autoclave.
SINTESIS DAN KARAKTERISASI ZNO-CU MENGGUNAKAN EKSTRAK KULIT JERUK MANIS Faizal Pristian Syah Putra Pristian; Munasir
Inovasi Fisika Indonesia Vol. 15 No. 1 (2026): Vol 15 No 1
Publisher : Prodi Fisika FMIPA Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ifi.v15n1.p115-121

Abstract

Abstrak Penelitian ini bertujuan untuk mensintesis dan mengkarakterisasi nanopartikel ZnO yang didoping dengan tembaga (ZnO-Cu) menggunakan metode green synthesis berbasis ekstrak kulit jeruk manis (Citrus sinensis L.) sebagai agen pereduksi dan penstabil. Metode ini dipilih karena ramah lingkungan dan berpotensi menghasilkan nanopartikel yang lebih stabil. Karakterisasi dilakukan menggunakan X-Ray Diffraction (XRD), Fourier Transform Infrared (FTIR), dan Scanning Electron Microscopy-Energy Dispersive X-ray (SEM-EDX). Hasil XRD menunjukkan bahwa struktur kristal ZnO-Cu tetap berada dalam fase wurtzite, namun terdapat pergeseran puncak yang mengindikasikan interaksi dopan Cu dalam kisi ZnO. Spektrum FTIR mengonfirmasi keberadaan gugus fungsional O–H, C=O, C–H, serta pembentukan CuO yang menandakan keberhasilan proses doping. Analisis SEM menunjukkan perbedaan signifikan pada morfologi antara ZnO murni dan ZnO-Cu 5%, di mana ukuran partikel ZnO-Cu 5% lebih kecil dan lebih terdispersi. Dengan demikian, doping Cu terbukti berpengaruh terhadap struktur kristal, morfologi, dan gugus fungsi nanopartikel, serta berpotensi meningkatkan performa material dalam aplikasi fotokatalitik.  Abstract This study aims to synthesize and characterize copper-doped zinc oxide nanoparticles (ZnO-Cu) using a green synthesis method based on sweet orange peel (Citrus sinensis L.) extract as a reducing and stabilizing agent. This environmentally friendly approach offers the potential to produce more stable nanoparticles. Characterization was performed using X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), and Scanning Electron Microscopy–Energy Dispersive X-ray (SEM-EDX). XRD results confirmed that the ZnO-Cu nanoparticles retained the typical wurtzite crystal structure, although slight peak shifts indicated lattice distortion caused by Cu doping. FTIR spectra revealed the presence of O–H, C=O, and C–H functional groups, along with CuO formation, suggesting successful incorporation of copper into the ZnO matrix. SEM analysis showed significant differences in morphology between pure ZnO and ZnO-Cu 5%, with the doped sample exhibiting smaller and more homogeneously distributed particles. Overall, Cu doping was found to influence the crystal structure, morphology, and surface functional groups of the nanoparticles, indicating improved potential for photocatalytic applications. 
EFEKTIVITAS KARAKTERISTIK ANTIBAKTERI PADA HIDROGEL KITOSAN/GO SEBAGAI WOUND DRESSING Pir Nanda Ningsih; Diah Hari Kusumawati
Inovasi Fisika Indonesia Vol. 15 No. 1 (2026): Vol 15 No 1
Publisher : Prodi Fisika FMIPA Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ifi.v15n1.p122-131

Abstract

Abstrak Kitosan merupakan polimer alami yang memiliki potensi besar untuk aplikasi pembalut luka karena biokompatibilitas tinggi, toksisitas rendah, dan kemampuannya dalam merangsang respons imun. Penambahan graphene oxide (GO) diharapkan dapat meningkatkan sifat antibakteri dan daya serap material. Penelitian ini bertujuan untuk mengevaluasi karakteristik morfologi dan aktivitas antibakteri dari komposit kitosan/GO dalam bentuk hidrogel sebagai kandidat bahan pembalut luka. Kitosan disintesis dari limbah udang dan GO berasal dari arang tempurung kelapa menggunakan metode Hummers termodifikasi, kemudian dikompositkan melalui stirer dan ultrasonifikasi. Karakterisasi dilakukan menggunakan Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), dan uji antibakteri terhadap Staphylococcus aureus dan Escherichia coli. Hasil FTIR menunjukkan keberadaan gugus fungsional khas dari kitosan dan GO. Analisis morfologi dengan SEM menunjukkan permukaan hidrogel yang halus dan padat tanpa struktur pori, yang kurang ideal untuk penyerapan luka. Uji antibakteri menunjukkan bahwa penambahan GO tidak memberikan peningkatan signifikan terhadap aktivitas antibakteri terhadap Staphylococcus aureus dan Escherichia coli, kecuali pada komposit dengan 0,5 gr  GO yang menunjukkan zona hambat sebesar 12,4 mm terhadap S. aureus. Abstract  Chitosan is a natural polymer with great potential for wound dressing applications due to its high biocompatibility, low toxicity, and ability to stimulate immune responses. The incorporation of graphene oxide (GO) is expected to enhance the antibacterial properties and fluid absorption capacity of the material. This study aims to evaluate the morphological characteristics and antibacterial activity of chitosan/GO composites in hydrogel form as a potential wound dressing material. Chitosan was synthesized from shrimp shell waste, and graphene oxide (GO) was derived from coconut shell charcoal using a modified Hummers’ method. The two components were then composited using magnetic stirring followed by ultrasonication. Characterization was carried out using Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), and antibacterial testing against Staphylococcus aureus and Escherichia coli. FTIR results confirmed the presence of functional groups characteristic of chitosan and GO. SEM analysis revealed a smooth and dense surface morphology without porous structures, which is less favorable for optimal wound exudate absorption. Antibacterial tests showed that the addition of GO did not significantly enhance antibacterial activity against S. aureus and E. coli, except for the composite containing 0.5 g of GO, which exhibited an inhibition zone of 12.4 mm against S. aureus.
RANCANG BANGUN ALAT TAPERING FIBER OPTIK BERBASIS ARDUINO UNO DENGAN SISTEM PEMANAS DAN PENARIKAN TERKENDALI Surya Maharani Agnes; Muhimmatul Khoiro; Meta Yantidewi
Inovasi Fisika Indonesia Vol. 15 No. 1 (2026): Vol 15 No 1
Publisher : Prodi Fisika FMIPA Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ifi.v15n1.p84-91

Abstract

Abstrak Penelitian ini membahas perancangan dan pengembangan alat tapering fiber optik berbasis mikrokontroler Arduino UNO yang dilengkapi dengan sistem pemanas dan sistem penarik otomatis. Tujuan utama dari alat ini adalah untuk menghasilkan fiber optik bertaper yang presisi dan konsisten untuk mendukung aplikasi sensor berbasis gelombang evanescent. Sistem pemanas menggunakan kawat nikrom sebagai elemen pemanas yang dikendalikan oleh logika PID melalui sinyal PWM untuk menjaga suhu stabil pada kisaran 50–55 °C. Suhu diukur secara real-time menggunakan sensor termokopel tipe K yang terhubung ke modul MAX6675. Proses penarikan fiber dilakukan menggunakan motor stepper 28BYJ-48, yang hanya aktif ketika suhu telah mencapai suhu yang ditargetkan, untuk menghindari kesalahan yang tidak diinginkan pada fiber. Untuk menjamin kestabilan proses, sistem juga dilengkapi dengan sensor load cell yang dikalibrasi dan digunakan untuk memantau gaya tarik selama tapering berlangsung. Seluruh sensor, termasuk suhu dan gaya, telah melalui proses kalibrasi terhadap alat ukur standar untuk memastikan akurasi pembacaan. Hasil pengujian menunjukkan bahwa alat mampu bekerja secara stabil dan menghasilkan fiber taper dengan bentuk waist yang halus, meruncing, dan simetris. Diameter hasil tapering bervariasi tergantung panjang penarikan, dan konsisten dengan prinsip penyempitan fiber. Sistem ini tidak hanya bekerja secara fungsional, tetapi juga sederhana, hemat biaya, dan fleksibel untuk digunakan di lingkungan laboratorium. Dengan demikian, alat ini sangat potensial untuk mendukung penelitian dan pengembangan sensor fiber optik untuk deteksi logam berat seperti Kadmium (Cd) dalam air. Abstract This study discusses the design and development of an Arduino UNO microcontroller-based optical fibre tapering tool equipped with a heating system and an automatic pulling system. The main purpose of this tool is to produce precise and consistent tapered optical fibres to support evanescent wave-based sensor applications. The heating system uses nichrome wire as the heating element, controlled by PID logic via PWM signals to maintain a stable temperature within the range of 50–55°C. Temperature is measured in real-time using a type K thermocouple sensor connected to the MAX6675 module. The fibre drawing process is performed using a 28BYJ-48 stepper motor, which only activates once the target temperature has been reached to avoid unintended errors in the fibre. To ensure process stability, the system is also equipped with a calibrated load cell sensor used to monitor the pulling force during tapering. All sensors, including temperature and force, have undergone calibration against standard measuring instruments to ensure reading accuracy. Test results show that the device operates stably and produces tapered fibres with a smooth, tapered, and symmetrical waist shape. The diameter of the tapered fibre varies depending on the drawing length and is consistent with the principle of fibre narrowing. This system not only functions effectively but is also simple, cost-effective, and flexible for use in a laboratory environment. As such, the device holds significant potential for supporting research and development of fibre optic sensors for detecting heavy metals such as cadmium (Cd) in water.
FENOMENA DISTORSI KISI PADA KERAMIK TiO2 RUTIL BERDASARKAN UJI XRD DAN PERSAMAAN DEBYE SCHERRER nida alifah; Frida Ulfah Ermawati
Inovasi Fisika Indonesia Vol. 15 No. 1 (2026): Vol 15 No 1
Publisher : Prodi Fisika FMIPA Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ifi.v15n1.p92-102

Abstract

Abstrak Titanium Dioksida (TiO2) rutil merupakan material keramik dielektrik yang berpotensi diaplikasikan pada berbagai perangkat microwave seperti resonator dielektrik, kapasitor, filter, dan antena. Dalam makalah ini, bubuk TiO2 rutil disintesis menggunakan metode sederhana (pelarutan serbuk logam Titanium dengan HCl), dikasinasi pada suhu 800 ℃ selama 4 jam hingga menjadi serbuk kristalin. Serbuk kristalin difabrikasi menjadi keramik TiO2 berdiameter 8 mm, disinter pada 1000 ℃ selama 4, 6, dan 8 jam. Uji XRD dilakukan guna mengetahui struktur keramik TiO2 berupa parameter kisi, mikrostrain (distorsi kisi), dan ukuran kristalit. Metode sintesis sederhana tersebut ternyata mampu menghasilkan fasa tunggal rutil. Variasi waktu tahan sinter mempengaruhi parameter kisi keramik, yaitu menjadi lebih besar dari parameter kisi pada kartu PDF No. 21-1276; dengan kata lain variasi waktu tahan sinter menyebabkan distorsi kisi. Menariknya, fenomena distorsi tersebut semakin kecil seiring dengan meningkatnya waktu tahan sinter. Penyebab berkurangnya distorsi tersebut belum dapat dijelaskan hingga makalah ini ditulis. Selain itu, penyusutan distorsi kisi ini didukung oleh data mikrostrain dan ukuran kristalit (Debye Scherrer). Mikrostrain turun dari 2,53 (4 jam) menjadi 2,52 (6 jam) dan 2,48 (8 jam), sedangkan ukuran kristalit naik dari 35,794 nm (4 jam) menjadi 35,983 nm (6 jam) hingga 36,754 nm (8 jam). Abstract Rutile Titanium Dioxide (TiO2) is a dielectric ceramic material with potentiallin various microwave devices such as dielectric resonators, capacitors, filters, and antennas. In this paper, rutile TiO2 powder was synthesized using a simple method involving the dissolution of titanium metal powder in HCl, followed by calcination at 800 ℃ for 4 hours to obtain a crystalline powder. The crystalline powder was then fabricated into TiO2 ceramics with a diameter of 8 mm, followed by sintering at 1000 ℃ for 4, 6, and 8 hours. X-ray Diffraction (XRD) analysis was conducted to investigate the structure of the TiO2 ceramics in terms of lattice parameters, microstrain (lattice distortion), and crystallite size. This simple synthesis method successfully produced a single rutile phase. Variations in sintering holding time affected the lattice parameters of the ceramics, which became larger than those reported in PDF Card No. 21-1276, indicating the presence of lattice distortion. Interestingly, the degree of lattice distortion decreased with increasing sintering holding time. This reduction in lattice distortion is attributed to elastic strain relaxation. Furthermore, the decrease in lattice distortion is supported by microstrain and crystallite size data obtained using the Debye-Scherrer method. The microstrain decreases from 2.53 (4 h) to 2.52 (6 h) and 2.48 (8 h), while crystallite size increased from 35.794 nm (4 h) to 35.983 nm (6 h) and finally to 36.754 nm (8 h).
ANALISIS KEAKURATAN SOLUSI CENTROID MOMENT-TENSOR (CMT) GEMPA BUMI DI WILAYAH JAWA TENGAH MENGGUNAKAN METODE GISOLA, SUDUT KAGAN DAN MEAN ABSOLUTE PERCENTAGE ERROR (MAPE) PADA SOFTWARE JOKOTINGKIR Fairhiza Firman Arjangga; Arie Realita; Madlazim
Inovasi Fisika Indonesia Vol. 15 No. 1 (2026): Vol 15 No 1
Publisher : Prodi Fisika FMIPA Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ifi.v15n1.p132-146

Abstract

Abstrak Penelitian ini menganalisis keakuratan solusi Centroid Moment Tensor (CMT) gempa bumi di wilayah Jawa Tengah menggunakan software Jokotingkir yang mengimplementasikan algoritma GISOLA, dengan pembanding data dari GlobalCMT melalui metode Sudut Kagan dan Mean Absolute Percentage Error (MAPE). Dari 10 kejadian gempa dengan magnitudo ≥ 5,0 pada tahun 2020–2024, hasil analisis menunjukkan bahwa sebagian besar parameter strike dan dip memiliki kesesuaian cukup baik dengan nilai MAPE masing-masing sebesar 22,99% (dapat diterima) dan 12,39% (baik), sementara rake menunjukkan hasil paling bervariasi dengan MAPE sebesar 49,44% karena sensitivitasnya terhadap arah slip. Analisis Sudut Kagan juga mengindikasikan bahwa sebagian besar solusi CMT menunjukkan kesesuaian sedang hingga tinggi, meskipun beberapa gempa menunjukkan ketidaksesuaian signifikan. Berdasarkan temuan tersebut, disarankan agar pengembangan difokuskan pada peningkatan akurasi estimasi rake melalui penyempurnaan algoritma inversi, perbaikan kualitas data waveform, perluasan cakupan stasiun seismik lokal, dan penerapan model kecepatan 3D regional yang lebih representatif. Abstract This study analyzes the accuracy of Centroid Moment Tensor (CMT) earthquake solutions in Central Java using the Jokotingkir software, which implements the GISOLA algorithm, by comparing the results with data from GlobalCMT through the Kagan Angle and Mean Absolute Percentage Error (MAPE) methods. Based on 10 earthquake events with magnitudes ≥ 5.0 between 2020 and 2024, the analysis shows that most strike and dip parameters are reasonably consistent, with MAPE values of 22.99% (acceptable) and 12.39% (good), respectively, while rake exhibits the highest variation with a MAPE of 49.44% due to its sensitivity to slip direction. The Kagan Angle analysis also indicates that most CMT solutions demonstrate moderate to high similarity, although several events reveal significant discrepancies. These findings suggest that further development should prioritize improving rake estimation accuracy by refining the inversion algorithm, enhancing waveform quality, expanding the coverage of local seismic stations, and applying more representative 3D regional velocity models.

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