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All Journal Gravitasi: Jurnal Pendidikan Fisika dan Sains EINSTEIN (E-JOURNAL)
Ayu Lestari, Maysa Indah
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Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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Analisis Jenis Patahan dan Arah Slip Gempa Bumi Aceh-Sumbar M≥6 Menggunakan Data Global CMT Az Zuhriyyah, Nadiyah; Ayu Lestari, Maysa Indah
Jurnal Pendidikan Fisika dan Sains Vol 8 No 02 (2025): GRAVITASI: JURNAL PENDIDIKAN FISIKA DAN SAINS
Publisher : Program Studi Pendidikan Fisika FKIP Universitas Samudra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33059/gravitasi.jpfs.v8i02.13993

Abstract

Penelitian ini menganalisis karakteristik jenis patahan dan arah slip mekanisme fokal gempa bumi bermagnitudo M ≥ 6 di wilayah Aceh hingga Sumatera Barat selama periode 1990-2024. Data mekanisme fokal diperoleh dari basis data Global Centroid Moment Tensor (GCMT), kemudian divisualisasikan menggunakan plot bola fokal melalui Jupyter Notebook berbasis Anaconda. Hasil penelitian menunjukkan bahwa sesar geser mendatar (strike-slip) merupakan mekanisme dominan pada sistem Sesar Sumatera, sedangkan sesar naik (reverse fault) lebih umum ditemukan pada zona megathrust di lepas pantai barat Sumatera. Pola persebaran mekanisme ini mengindikasikan peran Sesar Sumatera sebagai sumber utama aktivitas gempa di daratan Sumatera, serta implikasi zona subduksi Indo-Australia sebagai penghasil gempa besar di wilayah laut. Temuan ini memberikan pemahaman yang lebih jelas mengenai dinamika tektonik di wilayah Sumatera dan mendukung upaya mitigasi bahaya gempa bumi di masa mendatang.
IDENTIFICATION OF FAULTS AND SLIP DIRECTIONS THROUGH A STUDY OF FOCAL MECHANISMS IN NORTH SUMATRA (2018-2024) Ayu Lestari, Maysa Indah; Sirait, Ratni; Lubis, Lailatul Husna
EINSTEIN (e-Journal) Vol. 14 No. 1 (2026): EINSTEIN (e-Journal)
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ps22ej09

Abstract

North Sumatra is located in the Ring of Fire zone, making it prone to earthquakes due to the convergence of the Indo-Australian and Eurasian plates, which form the 390 km long Sumatra Fault. This study aims to analyze the focal mechanism of earthquakes in North Sumatra during the period 2018-2024 using data from the Global Centroid Moment Tensor (GCMT). The analysis focuses on determining the type of earthquake mechanism, fault plane orientation, and slip direction and characteristics based on 21 earthquake events with magnitudes ranging from 4.8 to 5.4 Mw, analyzed using parameters such as location, time, depth, and nodal plane orientation. The results of the study indicate that earthquakes occurring in North Sumatra are dominated by strike-slip faults with horizontal movement. The orientation of the fault planes generally points northwest-southeast (NW-SE) and northeast-southwest (NE-SW), consistent with the characteristics of the Sumatra Fault and its segments, such as Renun, Toru, Barumun, and Angkola. Most of the earthquakes occurred at shallow to intermediate depths, posing a potential risk of damage in densely populated areas. These findings are expected to enhance regional geotectonic understanding and support earthquake disaster mitigation strategies in North Sumatra.
Co-Authors Az Zuhriyyah, Nadiyah Lubis, Lailatul Husna Ratni Sirait, Ratni