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All Journal Jurnal Pengabdian Masyarakat Sains Indonesia (Indonesian Journal Of Science Community Services) Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Dewantara Journal of Technology
Rimawanto Gultom
Universitas Pattimura
Agriculture, Biological Sciences & Forestry Automotive Engineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Economics, Econometrics & Finance Education Electrical & Electronics Engineering Library & Information Science Physics Public Health Social Sciences

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Analisis Karakteristik Petrologi dan Petrografi Satuan Batu Gamping Terumbu pada Formasi Wapulaka Daerah Waruruma, Kecamatan Kokalukuna, Kota Baubau, Provinsi Sulawesi Tenggara Sri Indriati; Ratih Ratumanan; Nasya Syahnur Pattimura; Erfin Elly; Rimawanto Gultom
Dewantara Journal of Technology Vol. 6 No. 1 (2025)
Publisher : Akademi Teknologi Industri Dewantara Palopo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59563/djtech.v5i2.309

Abstract

Penelitian ini bertujuan untuk mengidentifikasi karakteristik litologi batuan karbonat berdasarkan integrasi pengamatan megaskopis di lapangan dan analisis petrografi mikroskopis. Lokasi penelitian berada pada Formasi Wapulaka dengan titik koordinat X: 50°16’43,75” dan Y: 122°42’50”. Pengamatan mikroskopis dilakukan pada sampel batuan segar menggunakan perbesaran total 50×. Hasil penelitian menunjukkan bahwa satuan batuan di lokasi penelitian termasuk ke dalam sedimen karbonat bertekstur nonklastik. Secara mikroskopis, batuan menunjukkan struktur masif, tekstur mud-supported, porositas tinggi bertipe vug, dengan ukuran butir berkisar antara 0,02–0,6 mm dan bentuk butir cenderung membulat. Komposisi batuan didominasi oleh mud karbonat (75%), disertai skeletal grain berupa fosil foraminifera (10%) dan mineral kalsit (15%), berdasarkan klasifikasi Dunham (1962). Batuan di Daerah penelitian diidentifikasi sebagai batugamping tipe packstone. Integrasi data lapangan dan laboratorium memberikan gambaran mengenai kondisi geologi dan karakteristik batuan karbonat pada Formasi Wapulaka.
Analisis Potensi Longsor Berdasarkan Karakteristik Geologi, Geometri Lereng, dan Nilai Faktor Keamanan (FoS) di Kecamatan Kokalukuna, Kota Baubau Sri Indriati; Erfin Elly; Ratih C F Ratumanan; Nasya Syahnur P; Rimawanto Gultom
Dewantara Journal of Technology Vol. 6 No. 2 (2026)
Publisher : Akademi Teknologi Industri Dewantara Palopo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59563/djtech.v6i2.380

Abstract

Penelitian ini bertujuan untuk menganalisis potensi longsor pada daerah penelitian di Kecamatan Kokalukuna, Kota Baubau, berdasarkan karakteristik geologi, geometri lereng, serta nilai Faktor Keamanan (FoS). Metode yang digunakan meliputi pengamatan lapangan, analisis petrografi batuan, pengukuran geometri lereng, uji mekanika tanah, serta pemodelan kestabilan lereng menggunakan GeoStudio dan interpretasi data geolistrik Res2Dinv. Hasil penelitian menunjukkan bahwa lereng memiliki tinggi 12,2 m, sudut 40°, dan panjang 19 m, dengan kondisi material berupa tanah lepas dan lapisan lempung pasiran pada kedalaman 6–9 m yang berpotensi sebagai bidang gelincir. Nilai sudut geser dalam tanah sebesar 24° mengindikasikan tingkat kepadatan yang rendah. Hasil simulasi menunjukkan nilai FoS sebesar 0,959 (<1), yang berarti lereng dalam kondisi tidak stabil dan rentan longsor. Tipe longsoran yang teridentifikasi adalah longsoran rotasi dengan bidang gelincir berbentuk cekung. Faktor penyebab utama longsor meliputi kondisi geologi berupa Formasi Wapulaka yang didominasi lempung, kemiringan lereng yang curam, peningkatan kadar air akibat curah hujan, serta aktivitas manusia seperti pembangunan jalan. Upaya mitigasi yang direkomendasikan meliputi mitigasi struktural dan nonstruktural, seperti pembangunan infrastruktur penahan lereng, penyusunan peta rawan bencana, serta peningkatan kesadaran masyarakat. Hasil penelitian ini diharapkan dapat menjadi dasar dalam pengelolaan dan pengurangan risiko bencana longsor di wilayah penelitian.
Analisis Spasial Respon Situs Berdasarkan Vs30 USGS, Estimasi Amplifikasi dan Periode Dominan di Seram Bagian Timur Rimawanto Gultom; Sarinah Pakpahan; Nasya Syahnur Pattimura; Ratih C F Ratumanan; Sri Indriati
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 7 No. 2 (2026): May
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v7i2.1793

Abstract

This study focuses on Seram Bagian Timur, an area known for its complex geological setting and active tectonic. Recent seismic events, including the 26 September 2019 Ambon earthquake (Mw 6.5) and the 22 June 2025 earthquake near Bula (Mw 5.0), indicate the presence of active fault systems and heterogeneous subsurface conditions. These conditions govern how seismic waves are modified at the ground surface particularly variation in subsurface material properties. This effect is represented by the amplification factor, which estimated using the empirical relationship proposed by Fujimoto and Midorikawa. The objective of this study is to examine the spatial variability of site response using Vs30 data from USGS, along with amplification factors and dominant periods. The analysis is based on 6,550 grid points with a spatial resolution of approximately 930 m, supported by regional geological information. Data processing involved extraction, interpolation, and mapping, while amplification and dominant period were estimated using empirical approach The results indicate that Vs30 values range from 180 to 900 m/s (site classes BC–E), with lower values concentrated in coastal and eastern areas, and higher values predominantly found in the western part of the study area. Amplification factors vary between 0.77 and 2.79, generally falling within low to moderate categories. Meanwhile, dominant periods range from 0.133 to 0.667 seconds, representing soil types from hard to very soft conditions. Overall, the three parameters show a consistent pattern, where lower Vs30 values tend to correspond to higher amplification and longer dominant periods, reflecting less consolidated subsurface materials.
Petrogenesa Batuan Beku Dasit Daerah Hila dan Sekitarnya, Kabupaten Maluku Tengah Sitti Hafsa Kotarumalos; Resti Limehuwey; Warni Multi; Rimawanto Gultom; Erfin Elly
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 7 No. 2 (2026): May
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v7i2.1804

Abstract

A daisiac rock with the presence of abundant corderite and garnet that is considered quite unusual and named ambonite after its island name (Verbeek, 1905 in Pownall, 2013). Dacite rocks are scattered on Ambon Island and its surroundings. The Research Area is located in Hila Village, Central Maluku Regency located on Ambon Island. This study aims to determine the characteristics of petrogenesis of dasite rocks and their tectonic order. The methods used are studio analysis, geomorphological analysis, and geological structure analysis and laboratory analysis methods in the form of petrographic analysis, and XRF (X-Ray Fluoresence) analysis. Dacite rocks have porphyritic, intersetal, poikilitic, and reaction rim mineral textures. It also has a plagioclate microtexture in the form of coarse sieve, oscillatory zoning, rounded zone corners and glomerocrysts. Geochemically, this rock has an affinity  for alkaline calc  magma because it has a moderate K2O content and a fairly high SiO2 content. Ambonite rocks undergo magma differentiation in the form of fractional crystallization as seen from the harker diagram of the main oxide element. Based on its magma affinity of calc alkaline and its TiO2 content of less than 1%, it is indicated that ambonite rocks were formed in the archipelago. This order is assumed to have formed as a result of convergent interactions during the late Miocene.
Implementasi Kuliah Lapangan Geofisika Sebagai Wujud Pengabdian Kepada Masyarakat Untuk Identifikasi Manifestasi Sumber Panas Bumi di Daerah Tulehu Warni Multi; Phillipus J Patty; Resti Limehuwey; Sitti Hafsa Kotarumalos; Rimawanto Gultom; Aditya Ramadhan
Jurnal Pengabdian Masyarakat Sains Indonesia (Indonesian Journal Of Science Community Services) Vol. 8 No. 1 (2026): JPMSI (Jurnal Pengabdian Masyarakat Sains Indonesia)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpmsi.v8i1.1890

Abstract

With the advancement of technology in the earth sciences, the identification, investigation, and interpretation of subsurface conditions to identify natural resources beneath the surface has become easier. Geophysical technology is a powerful method to support this process. Using currently popular geophysical methods, this is not difficult to accomplish. The geomagnetic method, in particular, is a well-established geophysical method in the exploration world. This method is highly sensitive to vertical changes in the subsurface, making it highly suitable for application, particularly in geophysical fieldwork, to identify hot springs. It is hoped that students, the community service team, the community, and the Tulehu regional government will experience the positive impact of this program. As is known, the Tulehu region boasts abundant natural resources, yet they remain largely unexplored. Therefore, through the implementation of geophysical fieldwork as a community service activity, these manifestations can be properly investigated. In fact, with the application of geophysical applications, hot springs have been identified at several locations. This location has become iconic in education (geological-geophysical studies) and for tourism (geotourism) as a learning reference. In the future, the community service team hopes to continue developing other activities and innovations using a geophysical approach so that they can have a positive impact on various general audiences.
Co-Authors Aditya Ramadhan Elly, Erfin Nasya Syahnur P Nasya Syahnur Pattimura Phillipus J Patty Ratih C F Ratumanan Ratih Ratumanan Resti Limehuwey Resti Limehuwey Sarinah Pakpahan Sitti Hafsa Kotarumalos Sri Indriati Warni Multi