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All Journal Jambura Geoscience Review Geosfera: Jurnal Penelitian Geografi
Sari, Ni Luh Ananda Pusvita
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Earth & Planetary Sciences Education Environmental Science Social Sciences

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Tsunami Modeling Study in Geological Disaster Mitigation in the Kwandang Region Mooduto, Tirsya Aygina Jaenet; Ahmad, Fadhil Abdillah; Kodung, Mohamad Ashar Fitrayadi Ramdan S.; Sari, Ni Luh Ananda Pusvita; Hidayansya, Taufik; Permana, Aang Panji
Jambura Geoscience Review Vol 6, No 1 (2024): Jambura Geoscience Review (JGEOSREV)
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jgeosrev.v6i1.22561

Abstract

The northern coast of the northern arm of Sulawesi is the meeting place of 3 plates that collided with each other during the Neogene period. This condition makes the northern part of Gorontalo, especially Kwandang sub-district, very prone to earthquakes with magnitudes above 6 on the Richter scale (SR), which is one of the triggers for tsunamis. In the period from 1990 - 2008, there were 4 major earthquakes recorded in Gorontalo, namely 1990 (7.3 SR), 1991 (7.1 SR), 1997 (7.0 SR) and 2008 (7.7 SR). Therefore, further research is needed on the return period of the earthquake and the tsunami model that occurs and the sign of tsunami occurrence in the past. This research aims to determine the return period of the earthquake that caused the tsunami and the tsunami model as well as the sedimentology analysis of paleotsunami deposits. The calculation of the earthquake return period uses the Guttenberg-Richter method. Modeling calculations were carried out using the COMCOT numerical model. This model performs calculations by solving shallow water equations in the form of both linear and non-linear equations. Paleotsunami deposits were analyzed using the sedimentology method. The results of the calculation at a magnitude of 6.0 SR show that within 100 years, the study area has a chance of a potentially destructive earthquake of 1.14024978. The results of modeling the tsunami-prone zone, obtained an area of 165.598389 ha. And obtained paleotsunami deposits containing foraminifera with a sediment thickness of 14 cm.
Variasi Tekstur Serpentinisasi Lherzolit dan Harzburgit Ofiolit Banggai: Implikasi Petrogenesis dan Evolusi Mantel Badaru, Alifia Widya Warapsari; Sari, Ni Luh Ananda Pusvita; Rahmat, Mohamad Sayid; Paudi, Mohammad Ridho; T, Moh Fadlyansyah
Geosfera: Jurnal Penelitian Geografi Vol 4, No 2 (2025): Geosfera : Jurnal Penelitian Geografi
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/geojpg.v4i2.37558

Abstract

Serpentinized ultramafic rocks from the Banggai Ophiolite Complex, part of the East Sulawesi Ophiolite Belt in Central Sulawesi, preserve important records of geodynamic history and fluid-rock interaction in oceanic lithosphere. This study analyzes mineral composition, serpentinization textures, and petrogenetic implications of three drill core samples from borehole NA2, Banggai Regency. The study aims to characterize lithological and serpentinization texture variations across different peridotite types. Petrographic analysis was performed on thin sections using polarizing light microscopy; rock classification used the Streckeisen ultramafic rock classification diagram. Two samples were identified as serpentinized lherzolite with olivine content 35-40%, orthopyroxene 14-15%, clinopyroxene 13-20%, and one sample as serpentinized harzburgite with very high orthopyroxene (38%) and very low clinopyroxene (5%). Three serpentinization textures were identified: mesh texture after olivine in all three samples, bastite texture after pyroxene in one lherzolite only, and cataclastic texture in the second lherzolite only. The heterogeneous texture distribution indicates local structural control on serpentinization rather than uniform pervasive alteration. Clinopyroxene depletion contrasts between lithologies reflect heterogeneous partial melting degrees within a single ophiolite mantle segment.
Co-Authors Ahmad, Fadhil Abdillah Badaru, Alifia Widya Warapsari Hidayansya, Taufik Kodung, Mohamad Ashar Fitrayadi Ramdan S. Mooduto, Tirsya Aygina Jaenet Paudi, Mohammad Ridho Permana, Aang Panji Rahmat, Mohamad Sayid T, Moh Fadlyansyah