Lestari, Dwi (2024) Comparative Analysis of Ionospheric Disturbances Due To 2021 Typhoon Seroja, 2023 Typhoon Koinu and 2024 Japan Earthquake Using 3D Tomography Method. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Typhoon dan gempa bumi merupakan bencana alam yang memiliki potensi merusak infrastruktur dan menimbulkan korban jiwa sehinggan perlunya kajian mitigasi bencana lebih lanjut. Keduanya dapat menyebabkan gangguan ionosfer yang dapat diamati melalui nilai perubahan TEC dengan menggunakan teknologi GNSS. Penelitian ini bertujuan untuk membandingkan mekanisme gangguan ionosfer akibat Typhoon Seroja 2021, Typhoon Koinu 2023, dan gempa bumi Jepang M7.5 2024 menggunakan metode 3D tomografi GNSS-TEC. Analisis dilakukan dengan parameter fisis berupa perubahan nilai TEC, kecepatan propagasi gelombang, spektrum frekuensi, dan distribusi spasial temporal dari hasil model tomografi 3D. Hasil penelitian menunjukkan bahwa gempa bumi dan typhoon dapat menyebabkan gangguan ionosfer yang disebut CID dan CTIDs. CID akibat gempa bumi Jepang menghasilkan perubahan TEC ~1.199 TECU dan periode gangguan ~5 menit, sedangkan CTIDs akibat typhoon Seroja dan Koinu menghasilkan perubahan TEC -0.26-0.73 TECU dan periode gangguan 18-71 menit. CID akibat gempa bumi lebih singkat namun signifikan dibandingkan typhoon, yang menunjukkan gangguan dengan durasi lebih panjang. Hasil pemodelan 3D tomografi menunjukkan perbedaan pola dan ketinggian gangguan ionosfer. Anomali ionosfer akibat gempa bumi Jepang terdistribusi di sekitar epicenter, sedangkan anomali dari typhoon Seroja terdistribusi di azimuth 0-150° dan typhoon Koinu terdistribusi di azimuth 180-240° dimana keduanya mengikuti arah pergerakan typhoon. Selain itu, ketinggian anomali ionosfer akibat typhoon lebih rendah dibandingkan gempa bumi Jepang. Hasil penelitian ini memberikan informasi tentang perbandingan karakteristik gangguan ionosfer akibat typhoon dan gempa bumi, serta potensi penggunaannya dalam pengembangan sistem peringatan dini bencana di masa mendatang.
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Typhoons and earthquakes are natural disasters that have the potential to damage infrastructure and cause casualties, so further disaster mitigation studies are needed. Both can cause ionospheric disturbances which can be observed through changes in TEC values using GNSS technology. This research aims to compare the mechanisms of ionospheric disturbances caused by the 2021 Typhoon Seroja, 2023 Typhoon Koinu, and the 2024 M7.5 Japan earthquake using the 3D GNSS-TEC tomography method. The analysis was carried out using physical parameters in the form of changes in TEC values, wave propagation speed, frequency spectrum, and spatial temporal distribution from the results of the 3D tomography model. The research results show that earthquakes and typhoons can cause ionospheric disturbances called CID and CTIDs. The CID due to the Japanese earthquake produced a TEC change of ~1,199 TECU and a disturbance period of ~5 minutes, while the CTIDs due to the Seroja and Koinu typhoons produced a TEC change of -0.26-0.73 TECU and a disturbance period of 18-71 minutes. CID due to earthquakes is shorter but more significant than typhoons, which indicate disturbances of longer duration. The results of 3D tomography modeling show differences in the pattern and height of ionospheric disturbances. The ionospheric anomaly due to the Japanese earthquake was distributed around the epicenter, while the anomaly from the Seroja typhoon was distributed at an azimuth of 0-150° and the Koinu typhoon was distributed at an azimuth of 180-240°, both of which follow the direction of the typhoon's movement. In addition, the height of the ionospheric anomaly due to the typhoon was lower than the Japanese earthquake. The results of this research provide information about the comparative characteristics of ionospheric disturbances caused by typhoons and earthquakes, as well as their potential use in developing disaster early warning systems in the future.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Ionosfer, Typhoon, Gempa Bumi, GNSS-TEC, 3D Tomografi. Ionosphere, Typhoon, Earthquake, GNSS-TEC, 3D Tomography. |
| Subjects: | T Technology > T Technology (General) > T55.3.H3 Hazardous substances--Safety measures. |
| Divisions: | Faculty of Civil Engineering and Planning > Geomatics Engineering > 29101-(S2) Master Thesis |
| Depositing User: | Dwi Sri Lestari |
| Date Deposited: | 31 Jul 2024 06:09 |
| Last Modified: | 01 Oct 2026 02:37 |
| URI: | http://repository.its.ac.id/id/eprint/110291 |
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