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Algoritme deteksi kedatangan tsunami otomatis untuk sistem observasi tinggi muka air laut

Automatic tsunami arrival detection algorithm for sea level observation system

1Manado Geophysics Station, Meteorology Climatology and Geophysics Agency. Jl.Harapan 42, Manado, Sulawesi Utara, Indonesia 95161, Indonesia

2Master Program of Aquatic Sciences, Universitas Sam Ratulangi. Jl. Kampus, Bahu, Manado, Sulawesi Utara, Indonesia 95115, Indonesia

3Faculty of Fisheries and Marine Science, Universitas Sam Ratulangi, Indonesia

Received: 12 Dec 2020; Revised: 21 May 2021; Accepted: 17 Jun 2021; Available online: 2 Jul 2021; Published: 31 Jul 2021.
Open Access Copyright (c) 2021 Jurnal Teknologi dan Sistem Komputer
Creative Commons License This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

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Abstract
The automatic tsunami detection algorithm needs to put in the sea level observation system so it can give quick warning for society when tsunami happen. Therefore, we design an automatic tsunami detection algorithm that consists of three sub-algorithm, they are spike elimination, gap data filling, and tsunami detection. Spike elimination and gap data filling used to improve the sea level data which is often disturbed by spikes and gap data due to electronic factors. This algorithm tested using time-series tide gauge data that contain tsunami waveforms in Indonesia from 2007-2019. Results, about 54.52 % of 409 spikes have been eliminated while all of the gap data successfully filled. Furthermore, the tsunami detection uses DART (Deep-ocean Assessment and Reporting of Tsunamis) and TEDA (Tsunami Early Detection Algorithm) methods, able to detect 7 of 10 tsunami waveforms. However, there are 3 undetected tsunamis and 1 false detection. For detection time, this algorithm has an average delay of 7.7 minutes.
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Keywords: tsunami detection algorithm; spike elimination; gap data filling; tide gauge
Funding: Stasiun Geofisika Manado, Badan Meteorologi Klimatologi dan Geofisika;Universitas Sam Ratulangi

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