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All Journal Jurnal Geofisika Jurnal Teras Fisika : Teori, Modeling, dan Aplikasi Fisika
Harefa, Faradilla Firdani
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Earth & Planetary Sciences Energy Materials Science & Nanotechnology Physics

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Analisis perubahan Coulomb stress gempa bumi Mw 5,8 kabupaten Tapanuli Utara 1 Oktober 2022 Lubis, Lailatul Husna; Harefa, Faradilla Firdani; Sibuea, Christofel Haposan; Ginting, Mira Hestina
Jurnal Teras Fisika: Teori, Modeling, dan Aplikasi Fisika Vol 6 No 2 (2023): Jurnal Teras Fisika: Teori, Modeling, dan Aplikasi Fisika
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jtf.2023.6.2.8370

Abstract

Gempa bumi dengan magnitudo Mw 5,8 mengguncangkan wilayah Tapanuli Utara pada tanggal 1 Oktober 2022 (02:28:43 WIB) pada segemen Renun yang disebabkan oleh (right-lateral strike slip). Data gempa bumi utama dan parameter mekanisme sumber diperoleh dari Global CMT dan data gempa bumi susulan diperoleh dari katalog BMKG dengan rentang wilayah lokasi penelitian berada pada 1,60⁰ LU – 2,52⁰ LU dan 98,55⁰ BT – 99,50⁰ BT. Metode yang digunakani adalah metode Coulomb Stress dengan menggunakan software Coulomb 3.4. Hasil analisa perubahan coulomb stress yaitu daerah yang terdapat peningkatan stress sebesar 0 hingga 0,2 bar dan penurunan stress sebesar 0 hingga -0,2 bar. Daerah yang memiliki peningkatan stress berada pada daerah barat daya, tenggara, barat laut dan timur laut. Sedangkan daerah yang mengalami penurunan stress berada pada arah timur,utara, barat dan selatan.
Analisis Perubahan coulomb stress Gempa Bumi Cianjur 21 November 2022 Harefa, Faradilla Firdani; Lubis, Lailatul Husna; Sirait, Ratni
Jurnal Geofisika Vol 22 No 2 (2024): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36435/jgf.v22i2.617

Abstract

The earthquake that occurred in Cianjur Regency on November 21, 2022 with a magnitude of 5.6 Mw had a huge impact, including casualties and meterial damage. The location of the earthquake based on data sourced from BMKG was at -6.870° N and 107.016° E and the earthquake occurred due to the Cugenang fault. After the 5.6 Mw earthquake was followed by a series of aftershocks. The purpose of this study was to determine the effect of coulomb stress changes on the Cianjur earthquake and the direction of aftershock distribution using the coulomb stress method. The results of this study show the effect of coulomb stress on earthquakes in Cianjur Regency forming 8 lobes. 4 red lobes that mean an increase in stress, namely (north direction is in Cipanas and Pacet sub-districts, east direction is in Cugenang sub-district, south direction is in Cireunghas sub-district, and southwest to west direction is in Cikole sub-district) with a value of 0 to 0, 2 bar and 4 blue lobes indicating a decrease in stress, namely (northeast direction in Sukaresmi sub-district, southeast direction in Warungkondang, Cibeber and Cilaku sub-districts, southwest direction in Sukaraja, Sukabumi and Sukalarang sub-districts, and west to northwest direction in Nagrak, Kadudampit and Caringin sub-districts) with a value of 0 to -0.2 bar. The distribution of aftershocks was more in Cugenang sub-district and partly in Warungkondang sub-district.
Co-Authors Ginting, Mira Hestina Lubis, Lailatul Husna Ratni Sirait, Ratni Sibuea, Christofel Haposan