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All Journal JURNAL ILMIAH GEOMATIKA Indonesian Journal on Geoscience Indonesian Journal on Geoscience
Brotopuspito, Kirbani Sri
Universitas Gadjah Mada
Earth & Planetary Sciences Engineering Mathematics

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PENGGUNAAN FOTO UDARA FORMAT KECIL UNTUK IDENTIFIKASI KERENTANAN LINGKUNGAN TERHADAP BENCANA TSUNAMI DI YOGYAKARTA INTERNATIONAL AIRPORT (YIA) Fauzi, Yulian; Hartono, Hartono; Brotopuspito, Kirbani Sri; Kongko, Widjo
GEOMATIKA Vol 25, No 2 (2019)
Publisher : Badan Informasi Geospasial in Partnership with MAPIN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (633.146 KB) | DOI: 10.24895/JIG.2019.25-2.970

Abstract

Yogyakarta International Airport (YIA) terletak dalam zona rawan bencana tsunami dengan risiko tinggi. Wilayah ini berhadapan langsung dengan Samudera Hindia yang merupakan zona subduksi yang berpotensi menimbulkan gempa bumi megathrust dan tsunami besar. Penelitian ini bertujuan untuk melakukan identifikasi dan analisis kerentanan lingkungan terhadap bencana tsunami di YIA menggunakan Foto Udara Format Kecil (FUFK). Kerentanan lingkungan dinilai dari kondisi topografi, keberadaan petunjuk evakuasi, akses evakuasi, sumber daya untuk evakuasi, dan kondisi jalur evakuasi. Pengumpulan data melalui pemotretan FUFK menggunakan Wahana Udara Nir Awak (WUNA) dan pengamatan kondisi lingkungan. Hasil identifikasi dan analisis menunjukkan kerentanan lingkungan untuk menghadapi bencana tsunami di lokasi kajian masih rendah. Hal ini dapat dilihat dari keberadaan petunjuk arah evakuasi yang tidak tersebar dengan baik, terbatasnya jalan untuk jalur evakuasi, dan tidak adanya perbukitan. Tempat Evakuasi Sementara (TES) yang sangat mungkin ditetapkan di YIA dan sekitarnya adalah bangunan perlindungan evakuasi.
Gliding and Quasi-harmonic Tremor Behaviour of Raung Volcano: November 2014 Crisis Period Case Study Ipmawan, Vico Luthfi; Brotopuspito, Kirbani Sri; Triastuty, Hetty
Indonesian Journal on Geoscience Vol 5, No 1 (2018)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1307.912 KB) | DOI: 10.17014/ijog.5.1.13-21

Abstract

DOI: 10.17014/ijog.5.1.13-21The seismic activity of Raung Volcano was raised on 11 November 2014. As many as 1709 tremors were recorded followed by continuous tremors appearing in late November 2014. Quasi-harmonic and gliding tremors appeared in a spectrogram on 12 November 2014. The quasi-harmonic tremors refer to tremors that have no fully harmonic form in spectrum. The gliding harmonic tremors refer to harmonic tremors that have frequency jumps with either positive or negative increment. After signal restitution processing, the Maximum Entropy Spectral Analysis (MESA) method was applied in Raung recordings resulting the spectrum and the spectrogram of tremors. The quasi-harmonic tremors have the monotonic spectrum in its head and centre segment, and the harmonic one in its tails. There are twenty-four spectrums that show frequency changes between the monotonic and harmonic. The similarity between the fundamental frequency range of the monotonic and harmonic ones suggests that both signals are excited from a common resonator. The alternating of monotonic and harmonic respectively over this period is qualitatively similar with Julian’s synthetic time series about the nonlinear oscillator model. It is suggested that Raung Volcano magma pressure is sizeable to make a chaotic vibration. A pressure increasing in Raung magmatic conduit causes the increasing of P-wave velocity and makes a positive gliding frequency.
Gliding and Quasi-harmonic Tremor Behaviour of Raung Volcano: November 2014 Crisis Period Case Study Ipmawan, Vico Luthfi; Brotopuspito, Kirbani Sri; Triastuty, Hetty
Indonesian Journal on Geoscience Vol 5, No 1 (2018)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.5.1.13-21

Abstract

DOI: 10.17014/ijog.5.1.13-21The seismic activity of Raung Volcano was raised on 11 November 2014. As many as 1709 tremors were recorded followed by continuous tremors appearing in late November 2014. Quasi-harmonic and gliding tremors appeared in a spectrogram on 12 November 2014. The quasi-harmonic tremors refer to tremors that have no fully harmonic form in spectrum. The gliding harmonic tremors refer to harmonic tremors that have frequency jumps with either positive or negative increment. After signal restitution processing, the Maximum Entropy Spectral Analysis (MESA) method was applied in Raung recordings resulting the spectrum and the spectrogram of tremors. The quasi-harmonic tremors have the monotonic spectrum in its head and centre segment, and the harmonic one in its tails. There are twenty-four spectrums that show frequency changes between the monotonic and harmonic. The similarity between the fundamental frequency range of the monotonic and harmonic ones suggests that both signals are excited from a common resonator. The alternating of monotonic and harmonic respectively over this period is qualitatively similar with Julian’s synthetic time series about the nonlinear oscillator model. It is suggested that Raung Volcano magma pressure is sizeable to make a chaotic vibration. A pressure increasing in Raung magmatic conduit causes the increasing of P-wave velocity and makes a positive gliding frequency.
Co-Authors Hartono, Hartono Kongko, Widjo Triastuty, Hetty Vico Luthfi Ipmawan Yulian Fauzi