Investigasi Rangkaian Gunung Bawah Laut: Karakterisasi Geomorfologi dan Aktivitas Tektonovulkanik di Inner Banda Arc Inactive Segment Melalui Perspektif Geosains Kelautan

Saputra, Bayu (2024) Investigasi Rangkaian Gunung Bawah Laut: Karakterisasi Geomorfologi dan Aktivitas Tektonovulkanik di Inner Banda Arc Inactive Segment Melalui Perspektif Geosains Kelautan. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Inactive Segment Busur Banda disebabkan oleh subduksi lempeng samudera setelah pemisahan Gondwanaland di utara Australia membentuk Busur Banda-Sunda, dengan segmen vulkanik non-aktif di Alor, Atauro, Wetar, dan Romang yang berhenti beraktivitas sekitar 3-4 juta tahun lalu. Penelitian ini bertujuan untuk menginvestigasi potensi aktivitas vulkanik dan tektonik di segmen non-aktif Busur Banda dengan fokus pada Pulau Alor, Atauro, Wetar, dan Romang, yang diduga telah berhenti beraktivitas sekitar 3-4 juta tahun yang lalu. Data yang digunakan adalah berbagai sumber seperti multibeam echosounder, marine magnetometer, dan conductivity, temperature, and depth (CTD), serta Algoritma NETVOLC, MORVOLC, dan analisis geomorfologi. Melalui analisis geomagnetik, batimetri, dan data lainnya, penelitian ini mencari kemungkinan adanya sisa aktivitas vulkanik yang masih dapat dipicu oleh dinamika tektonik regional, serta mengidentifikasi potensi intrusi magma. Fokus penelitian pada gunung bawah laut di Laut Banda, tepatnya di Perairan Wetar, untuk mengungkap karakteristik geomorfologi, aktivitas vulkanik, struktur tektonik, dan proses geodinamika. Meskipun tidak ditemukan crater atau caldera, analisis MORVOLC dan NETVOLC menunjukkan perbedaan karakteristik untuk masing-masing gunung, dengan Sundu menunjukkan tanda-tanda sejarah aktivitas vulkanik yang lebih tinggi. Data hamburan balik dan geomagnetik menggambarkan substrat laut yang heterogen setelah klasifikasi pada batas -27dB dan potensi aktivitas vulkanik yang berbeda di setiap gunung. Aktivitas utamanya ditengarai pada Sundu dan Deing karena memiliki nilai SVD 5,84×10-5nT/m2 dan 2,21×10-5nT/m2 yang dapat menunjukkan intrusi karena lebih besar daripada mutlak minimal. Temuan WCI mengindikasikan tidak adanya potensi sisa hydrothermal vent pada pemisahan amplitudo water column 16,780 dB s.d. 19,020 dB. Analisis turbulensi melalui metode Optimized Thorpe menunjukkan adanya proses perpindahan massa air stabil di sekitar Sundu dan Deing, yakni pada kedalaman 0 s.d. 470 m di Sundu dan 0 s.d. 824 m di Deing. Hasil geomagnetik dan analisis struktur tektonik menunjukkan adanya aktivitas intrusi magma di Notu Munak dan Deing, sementara Sundu menunjukkan tanda-tanda aktivitas tektonik yang aktif. Hasil klasifikasi geomorfologi dan karakterisasi tektonovulkanik, Notu Munak diperkirakan memiliki fase dorman terakhir, sedangkan Sundu dimungkinkan telah mati walaupun sesar memungkinkan sebagai jalur magma.
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The Inactive Segment of the Banda Arc is a result of oceanic plate subduction following the separation of Gondwanaland in northern Australia, forming the Banda-Sunda Arc, with nonactive volcanic segments in Alor, Atauro, Wetar, and Romang ceasing activity approximately 3-4 million years ago. This study aims to investigate the potential volcanic and tectonic activity in the non-active segment of the Banda Arc, focusing on the islands of Alor, Atauro, Wetar, and Romang, which are suspected to have ceased activity around 3-4 million years ago. The data utilized include various sources such as multibeam echosounders, marine magnetometers, and conductivity, temperature, and depth (CTD) instruments, employing NETVOLC, MORVOLC algorithms, and geomorphological analysis. By leveraging geomagnetic analysis, bathymetry, and other data, this research seeks to identify possible remnants of volcanic activity that may still be triggered by regional tectonic dynamics and to identify potential magma intrusions. The study focuses on submarine mountains in the Banda Sea, specifically in the Wetar region, to reveal geomorphological characteristics, volcanic activity, tectonic structures, and geodynamic processes. Although no craters or calderas were found, MORVOLC and NETVOLC analyses indicate differing characteristics for each mountain, with Sundu showing signs of higher historical volcanic activity. Backscatter and geomagnetic data depict a heterogeneous seafloor substrate after classification at -27 dB boundaries, indicating varying volcanic potential across the mountains. Significant activity is suspected at Sundu and Deing due to their SVD values of 5.84×10⁻⁵ nT/m² and 2.21×10⁻⁵ nT/m², respectively, which are higher than the minimal absolute values, suggesting possible intrusions. WCI findings indicate no potential residual hydrothermal vent activity in the water column amplitude separation range of 16.780 dB to 19.020 dB. Turbulence analysis using the Optimized Thorpe method reveals mass water transfer processes around Sundu and Deing, with depths ranging from 0 to 470 m at Sundu and 0 to 824 m at Deing. Geomagnetic results and tectonic structural analysis suggest magma intrusion activity at Notu Munak and Deing, while Sundu shows signs of active tectonic activity. Geomorphological classification and tectono-volcanic characterization suggest that Notu Munak is in its final dormant phase, while Sundu may be extinct, though faulting may still provide a magma conduit.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Busur Banda-Sunda, Gunung Bawah Laut, Mitigasi Risiko Bencana, Segmen Vulkanik Non-aktif, Subduksi Samudera Banda-Sunda Arc, Disaster Risk Mitigation, Inactive, Oceanic Subduction, Submarine Volcano, Volcanic Segment
Subjects:	G Geography. Anthropology. Recreation > GB Physical geography > GB651 Subsidences (Earth movements)
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geomatics Engineering > 29202-(S1) Undergraduate Thesis
Depositing User:	Bayu Saputra
Date Deposited:	29 Jul 2024 05:48
Last Modified:	29 Jul 2024 05:48
URI:	http://repository.its.ac.id/id/eprint/109480

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