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Journal : BULLETIN OF THE MARINE GEOLOGY

GEOMORPHOLOGY OF SMALL ISLANDS AND ITS SEAFLOOR PROFILES IN THE EASTERN AND WESTERN HALMAHERA WATERS Abdul Motalib Angkotasan; Dietriech G Bengen; I Wayan Nurjaya; Neviaty P Zamani; Nyoman M.N Natih; Franto Novico
BULLETIN OF THE MARINE GEOLOGY Vol 37, No 2 (2022)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/bomg.37.2.2022.774

Abstract

The geomorphology of small islands in the eastern and western parts of Halmahera Island encompasses diversities of geological processes, island forms and types, and topography. The typology of the small islands to the west of Halmahera Island is volcanic and are categorized as hilly islands. To the east, there are coral islands classified as flat islands with smaller area contrast to volcanic ones. This study aims to analyze the land mass elevation of the small islands and the sub-bottom profiles in the eastern and western Halmahera waters. Island elevation data was obtained from Sentinel-2B imagery, whereas seafloor topographic data was acquired from direct field measurements using a GPS sounder. First, the image data underwent atmospheric, radiometric, and sunlight corrections, while the actual depth was estimated through bathymetry correction using tidal data. Then, QGIS version 3.16.6 and ArcGIS version 10.8 were used to analyze the data. The results show that the slope degree of volcanic islands is higher and their seafloor topography is steeper than that of coral islands. The slope degree of Ternate, Maitara, Tidore, and Hiri Islands, abbreviated as Termadoreh, is more than 30o with elevation of more than 100 meters, characterizing hilly islands. While there is only Pakal Island in Buli Bay that has a slope of 33o and the highest elevation of only 100 meters, it is nevertheless considered a flat island. Significantly, the different typologies indicate different morphogenesis and sub-bottom topography; i.e., volcanic islands have higher slope degrees and steeper seafloor profiles compared to coral islands.
Co-Authors . Sukenda Abdurrachman Baksir, Abdurrachman Adi Purwandana Adibrata, Sudirman Adil Mahfudz Firdaus Adil Mahfudz Firdaus Adil Mahfudz Firdaus Agus Atmadipoera Agus Saleh Atmadipoera Agus Sholeh Atmadipoera Ahmad Herison Akmala Dwi Nugraha Alan Frendy Koropitan Alimuddin, Alimuddin Amir Yarkhasy Yuliardi Andhi Setyonugroho Andi Agussalim, Andi Andri Purwandani Ari Purbayanto Ariane Koch-Larrouy Ario Damar Asep Sandra Budiman Asep Sandra Budiman Asep Sandra Budiman, Asep Sandra Baharuddin Baharuddin Bambang Kanti Laras Beale, Calvin S. Beginer Subhan Bengen, Detriech G Darmiati Dedi Sugianto Denny Alberto Satrya Gumay Derek Soto Dietrich G Bengen Dietriech G. Bengen Dietriech G. Bengen Dietriech Geoffrey Bengen Dondy Arafat Dwiyoga Nugroho Eddy Supriyono Edi Kusmanto Enang Harris Surawidjaja ESTY KURNIAWATI Esty Kurniawati Ety Parwati Ety Parwati Ety Parwati Ety Parwati fadli syamsudin Fani Safitri Ferawati Runtuboi Ferdy Gustian Firdaus, Adil M. Franto Novico Fredinan Yulianda Harpasis S Sanusi Harpasis S Sanusi Harpasis s. Sanusi Hefni Effendi Heron Surbakti Heron Surbakti Hidayat Pawitan Holyness Nurdin Singadimedja HS, Surjono I Gusti Bagus Wiksuana I Made Budiasa I Nyoman Kanca Ida Bagus Made Baskara Andika IG Wayan Adiwilaga Ikbal Marus, Ikbal Indra Jaya Indra Jaya Indra Jaya Indra Jaya Irmalita Tahir, Irmalita Irzal Effendi Ismail, Firdaut Ismudi Muchsin Ismudi Muchsin John I Pariwono Joko Purwanto Joko Santoso Jonson Lumban Gaol Kadarwan Soewardi Kadarwan Soewardi Kadarwan Soewardi Kadarwan Soewardi Kasman Kasman Khairunnisa Khairunnisa Kholil Kholil Kholil Kholil Kotta, Raismin Krisna Rendi Awalludin Kusnanto La Ode Nurman Mbay Leica Febby Shafitri Leni Maryani Lerma Yuni Siagian Luky Adrianto M. Zairin Junior Mahdi Kartasasmita Mahdi Kartasasmita Mahdi Kartasasmita Mahdi Kartasasmita Manalu, Janviter Marimin , Mario Putra Suhana Mennofatria Boer Muh. Ishak Jumarang Muhamad Muliadi Muhammad Agus Muljanto MUHAMMAD AGUS SUPRAYUDI Muhammad Marzuki Mulia Purba Mulia Purba Mulia Purba Mursalin Mursalin Najamuddin N Najamuddin Najamuddin, Najamuddin Nandi Abdul Aziz Nebuchadnezzar Akbar Neviaty P Zamani Neviaty P. Zamani Noor, Hariansyah Nugraha, Teguh Nur Asia Umar Nur Audina Nyoman M N Natih Nyoman M.N Natih Okgareta, Dema Paembonan, Rustam E Paputungan, Mohammad Sumiran Pramudyo Dipo Prayoga, Bintang Rasidi, Rasidi Rastina Ratu Almira Kismawardhani Ratuluhain, Eva Susan Richardus F Kaswadji Richardus F. Kaswadji Ridha Alamsyah Rikardi, Novit Riris Aryawati Risandi Dwirama Putra Rita Rafni Riyadi Subur, Riyadi Robin Saputra Robinson Sitepu Rustam Effendi Paembonan, Rustam Effendi Saenudin Sakka Sakka Salnuddin Salnuddin, Salnuddin Salsabila, Unik Hanifah Salsabilah, Raisyah Santi Susanti, Santi Satria Yukiadi Santoso Septy Heltria Setyo Handayani Setyo Handayani Sigid Hariyadi Siolimbona, Abdul Ajiz Solihin Solihin Soma Somantri Sucantra, Made Bayu Sugeng Budiharso Sugeng Budiharsono Suhaemi Supriyono, Supri Surjono HS Syamsul Bahri Agus, Syamsul Bahri Tri Hartanto Tri Prartono Tridoyo Kusumastanto Try Al Tanto Try Al Tanto Try Al Tanto Vincentius P Siregar Vincentius Siregar Wahab, Iswandi Wahyu W Pandoe Wibowo, Eko S Widodo S. Pranowo Yogi Cahyo Ginanjar Yonvitner - Yudi Setiawan Yuli Naulita Yusli Wardiatno Zibar, Zan Zulfikar, Andi