PENCITRAAN STRUKTUR HALUS TERMOHALIN MENGGUNAKAN SEISMIK REFLEKSI MULTIKANAL DI UTARA LAUT MALUKU

Jurnal Ilmu dan Teknologi Kelautan Tropis

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Title PENCITRAAN STRUKTUR HALUS TERMOHALIN MENGGUNAKAN SEISMIK REFLEKSI MULTIKANAL DI UTARA LAUT MALUKU
IMAGING THERMOHALINE FINE STRUCTURE USING MULTICHANNEL SEISMIC REFLECTION IN THE NORTHERN MALUKU SEA
 
Creator Firdaus, Randi
Manik, Henry Munandar
Atmadipoera, Agus Saleh
Zuraida, Rina
Purwanto, Catur
 
Subject acoustic impedance
ocean acoustic
seismic oceanography
seismic reflection
akustik kelautan
impedansi akustik
seismik oseanografi
seismik refleksi
 
Description Low-frequency acoustic such as marine seismic that has been commonly used in geological mapping is nowadays being developed as tools to map the water columns. This study aims to map thermohaline fine structure in the Northern Maluku Sea. Seismic reflection data from 72 channel along 239 km track line was processed to delineate water column structure. The depth-distance seismic oceanography section clearly showed reflectors at depth of 400 m and 800 m correspond to lower boundary of the seasonal and permanent thermocline layers, respectively. The reflections between depth of 400 m and 800 m were caused by the thermohaline staircase as confirmed by CTD data. Water column reflections showed the presence of internal wave-like structure in the northwestern Tufure sill which has height and wavelength about 102 m and 17 km, respectively. The seismic amplitude in the water column corresponded to the vertical contrast of physical oceanographic parameters such as temperature, salinity, and sound speed. Reflections in the water column could be caused by temperature gradients ranging contrast from 0.03°C/m to >0.20°C/m. The acoustic impedance in the internal wave-like zone was ranging from 0.8 x 106 kg/m3 m/s to 2.06 x 106 kg/m3 m/s. This research revealed that the marine seismic data can be useful for studying the water column characteristics in the Northern Maluku Sea.
Akustik frekuensi rendah seperti seismik laut yang umumnya digunakan untuk pemetaan geologi sekarang berkembang menjadi perangkat untuk memetakan kolom perairan. Penelitian ini bertujuan memetakan struktur halus termohalin (thermohaline fine structure) sepanjang lintasan seismik di Laut Maluku bagian utara. Data seismik refleksi dari 72 saluran sepanjang lintasan 239 km diproses untuk menggambarkan struktur kolom perairan di Laut Maluku. Penampang seismik oseanografi menunjukkan dengan jelas adanya reflektor pada kedalaman 400 m dan 800 m yang merupakan batas bawah lapisan termoklin musiman dan termoklin permanen. Di antara kedalaman 400 - 800 m terdapat refleksi yang disebabkan oleh perundakan termohalin (thermohaline staircase) seperti yang terkonfirmasi oleh data CTD. Data seismik kolom perairan memperlihatkan adanya struktur seperti gelombang internal di bagian barat laut ambang Tufure dengan tinggi dan panjang gelombang berturut-turut sekitar 102 m dan 17 km. Amplitudo seismik di kolom perairan menunjukkan kesesuaian dengan kontras vertikal parameter fisika oseanografi seperti suhu, salinitas, dan kecepatan suara. Refleksi di kolom perairan bisa disebabkan oleh kontras gradient suhu berkisar antara 0,03°C/m hingga >0,20°C/m. Impedansi akustik pada zona target berkisar antara 0,8 × 106 kg/m3 m/s hingga 2,06 × 106 kg/m3 m/s. Penelitian ini mengungkap bahwa data seismik kolom perairan bisa bermanfaat untuk mempelajari karakteristik kolom perairan di Laut Maluku bagian utara.
 
Publisher Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University
 
Date 2021-04-30
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
 
Format application/pdf
 
Identifier https://journal.ipb.ac.id/index.php/jurnalikt/article/view/32346
10.29244/jitkt.v13i1.32346
 
Source Jurnal Ilmu dan Teknologi Kelautan Tropis; Vol. 13 No. 1 (2021): Jurnal Ilmu dan Teknologi Kelautan Tropis; 151-162
2620-309X
2087-9423
10.29244/jitkt.v13i1
 
Language eng
 
Relation https://journal.ipb.ac.id/index.php/jurnalikt/article/view/32346/21598
 
Rights Copyright (c) 2021 Jurnal Ilmu dan Teknologi Kelautan Tropis
https://creativecommons.org/licenses/by-sa/4.0
 

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