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All Journal Geosfera: Jurnal Penelitian Geografi
Muhammad Kasim
Program Studi Teknik Geologi, Jurusan Ilmu Dan Teknologi Kebumian, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Negeri Gorontalo
Earth & Planetary Sciences Education Environmental Science Social Sciences

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Karakteristik Batuan Tuff Pada Daerah Mootilango Kabupaten Gorontalo Utara Provinsi Gorontalo Muh Hasym As'ari; Ahmad Zainuri; Muhammad Kasim
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.v4i2.32262

Abstract

The study area is located in Mootilango Village Anggrek Sub-district, North Gorontalo Regency, Gorontalo Province. Geographically, the study area is located at coordinates 0° 46' 0" - 0° 46' 45” LU and 122° 48' 0” - 122° 48' 45" BT with an area of about 3.7 km². The purpose of this study was to determine the characteristics of tuff rocks through petrological, petrographic and geochemical analysis in the laboratory. The results of petrological identification show that the rock types are coarse tuff, fine tuff and pyroclastic breccia. The results of petrographic analysis show that the tuff in this area belongs to Vitric tuff according to the classification of Schmid (1981). The results of geochemical analysis show that the tuff in the study area belongs to the basalt-andesite type transition rock group according to the classification of Le Bas et al. (1986). Two classification approaches were used in the analysis to determine the magma series of the rock, namely according to Irvine and Baragar (1971), which shows that the rock belongs to the tholeiitic magma series.
Kajian Tingkat Kerentanan Longsor Menggunakan Sistem Informasi Geografis Kecamatan Monano, Kabupaten Gorontalo Utara Fitria Maharani Putri Iwan Noho; Sri Maryati; Muhammad Kasim
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.v4i2.32092

Abstract

Gorontalo Province has areas that are prone to landslides, especially in North Gorontalo Regency. This study has two main objectives, namely identifying the lithology that makes up the research area and analyzing the level of landslide vulnerability in area. This study uses the Multi Criteria Evaluation (MCE) method with the use of GIS analysis to achieve its objectives. Determination of the level of landslide vulnerability is carried out by overlaying parameters such as lithology, straightness density, slope gradient, soil type, rainfall and land use. The lithology that makes up the research area consists of andesite, agglomerate, sandstone and alluvial deposit units. Based on the results of the analysis, landslide vulnerability in the research area can be categorized into 3 classes, namely. Low landslide susceptibility class (34.13 km2), medium landslide susceptibility class (66.89 km2) and high landslide susceptibility class (19.65 km2)
Co-Authors Ahmad Zainuri Fitria Maharani Putri Iwan Noho Muh Hasym As'ari Sri Maryati