Article Per Year (5 Year)
p-Index From 2021 - 2026
1.347
P-Index
This Author published in this journals
All Journal Journal Geological Processes, Risks, and Integrated Spatial Modeling
Rachmadhan, H.D.
Unknown Affiliation
Energy Engineering Environmental Science

Published : 8 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 8 Documents
Search

 1 
GEOLOGI DAERAH PALAES DAN SEKITARNYA KECAMATAN LIKUPANG BARAT, KABUPATEN MINAHASA UTARA, SULAWESI UTARA KADIR, ALVYUS; Budiharso, Agus Santoso; Rachmadhan, H.D.
Journal Geological Processes, Risks, and Integrated Spatial Modeling Vol 3 No 1 (2025): Journal Geological Processes, Risk and Integrated Spatial Modeling
Publisher : LPPM Universitas PRISMA

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This research aims to analyze the geological conditions of the Palaes area and its surroundings in West Likupang District, North Minahasa Regency, North Sulawesi. The study covers an area of approximately 16 km², administratively including the villages of Palaes, Lansa, Lantung, Kulu, and Warisa. The research method involves surface geological mapping at a scale of 1:10,000, including geomorphological observation, lithological analysis, structural measurement, and petrographic analysis. Data were processed using the Dips software and spatial analysis based on DEMNAS to interpret morphological lineaments. The results show that the geomorphology of the study area consists of six landform units formed by three main genetic processes: structural, denudational, and fluvial. The stratigraphy comprises four lithological units: the Palaes Sandstone Unit, the Palaes Breccia Unit, the Lansa Andesitic Lava Unit, and the Alluvial Unit. Structural data indicate dominant lineaments trending northwest–southeast, interpreted as normal faults, evidenced by geomorphic features such as waterfalls and straight valleys. The geological history reflects a sequence of sedimentation and volcanic activity, followed by tectonic processes that shaped the major geological structures of the region. This research produced a geological map, a geomorphological map, and a stratigraphic column that serve as a scientific basis for geological resource exploration, hazard assessment, and land-use planning based on local geological characteristics.
GEOLOGI DAERAH LANSOT DAN SEKITARNYA, KECAMATAN TARERAN, KABUPATEN MINAHASA SELATAN, SULAWESI UTARA: GEOLOGI DAERAH LANSOT DAN SEKITARNYA, KECAMATAN TARERAN, KABUPATEN MINAHASA SELATAN, SULAWESI UTARA Mewengkang, Berliano; Momongan, Andrew; Rachmadhan, H.D.
Journal Geological Processes, Risks, and Integrated Spatial Modeling Vol 3 No 1 (2025): Journal Geological Processes, Risk and Integrated Spatial Modeling
Publisher : LPPM Universitas PRISMA

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Study area is located in North Sulawesi, precisely in Lansot Village, Tareran District, South Minahasa Regency. This research aims to investigate the geological conditions of the area, including geomorphological parameters, stratigraphy, petrology, and petrography, as well as to reconstruct its geological history, which will be presented in a 1:25,000-scale geological map. The methods employed in this study include SRTM image analysis, field observations, and laboratory analysis of rock samples.Geomorphologically, the study area is divided into three landform units: the remaining hills (VD4), Dissected Volcanic Slopes (VD2), and Pyroclastic Ridge Flow (V12). Stratigraphically, the rock succession in the area, from oldest to youngest, consists of: Rumoong Lansot Tuff, Lapi Tuff, and Tumaluntung Tuff. The geological structures in the area are the result of rock and crustal deformation that has occurred over thousands of years. The geological history of the study area began when it was still part of the ancient Tondano volcano, which later collapsed due to a major explosive eruption, giving rise to younger volcanic centers that became the sources of Quaternary volcanic rocks (Qv).
ANALISIS TINGKAT KERAWANAN LONGSOR MENGGUNAKAN SISTEM INFORMASI GEOGRAFIS (SIG) PADA KECAMATAN TOMOHON BARAT DAN UTARA KOTA TOMOHON PROVINSI SULAWESI UTARA Luntungan, P. B. G.; Rachmadhan, H.D.; Tandipajung, J.
Journal Geological Processes, Risks, and Integrated Spatial Modeling Vol 1 No 2 (2023): JGPRISM: Journal Geological Processes, Risks and Integrated Spatial Modeling
Publisher : LPPM Universitas PRISMA

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Natural disasters are natural events that can occur anywhere and at any time, causing material and material losses immaterial to people's lives. Landslides are one of the natural disasters that generally occur in mountainous areas, especially in the rainy season. West and North Tomohon sub-districts are areas that have the potential to experience landslides because the morphology of North and West Tomohon District varies, such as highlands, mountains and hills. One of The way that can be applied to estimate landslide disasters is to use an application that is able to take inventory affected locations, namely geographic information systems that have the ability to store, process, analyze andpresents geographically referenced data. In this research, soil vulnerability analysis was carried out using the weighting method and Scoring. The creation of this landslide susceptibility map is the result of overlaying secondary data such as DEM, cover maps land, rainfall data, regional geological maps, and soil type maps. Determining the level of landslide vulnerability is carried out by: multiplying the score by the weight for each parameter and then adding up the results for age. The value is classified into 4 landslide-prone zones, namely low, medium, high and very high. This research produces a landslide prone zoning map divided into 3 classes of vulnerability, namely medium class in Woloan Village, high class in Kaskakasen and Kayawu Village and Very high class in Taratara and Kinilow Villages. Based on five factors that influence landslide disasters, bulk factors Rain has the highest score which is the most dominant factor in influencing the occurrence of landslides. ResultsIt is hoped that the research carried out can be used as basic information for disaster mitigation, andregional development
GEOLOGI DAN STUDI FASIES GUNUNGAPI AWU, DAERAH BUNGALAWANG DAN SEKITARNYA, KECAMATAN TAHUNA, KABUPATEN KEPULAUAN SANGIHE, SULAWESI UTARA Djaya, J.H.M.; Rachmadhan, H.D.
Journal Geological Processes, Risks, and Integrated Spatial Modeling Vol 2 No 1 (2024): Journal Geological Processes, Risks, and Integrated Spatial Modeling
Publisher : LPPM Universitas PRISMA

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The Sangihe Islands Regency, North Sulawesi Province, is situated between the Talaud Islands Regency and Biaro Islands Regency. This region hosts several active volcanoes, such as Mount Banua Wuhu and Mount Awu, the latter being the highest point in Tahuna District. This study focuses on the volcanic geology, specifically the facies of Mount Awu, conducted in the Bungalawang area of Tahuna District. The methodology involved field surveys encompassing direct observations of surface geological conditions, followed by laboratory analysis and studies. The identification of volcanic facies was based on geomorphology, volcanic rock stratigraphy, and geological structures. Research findings indicate that the study area falls within the distal facies of Mount Awu. The stratigraphy of the area comprises units such as Volcanic Rock Unit, Tuff Santiago Breccia Insert, Santiago Tuff Insert Breccia, Tuff Manente Breccia Insert, Manente Tuff Insert Breccia, and Alluvial Unit. Geomorphological identification, geological structure analysis, and stratigraphy reveal that the study area constitutes a distal facies located at the foothills of Mount Awu. Geological structure analysis indicates the presence of fractures showing a main stress direction towards N3240E. The geological history of the study area began with the formation of the Volcanic Rock Unit due to the eruption of the ancient Sahendarumang volcano. Subsequently, a series of eruption and deposition events formed distinct stratigraphic units. This research contributes significantly to understanding the geological and geological history of the region. Its findings are applicable in various practical applications, including disaster mitigation and natural resource development. This study also serves as a foundation for further research in the field of geology, particularly Volcanology.
POTENSI GEOWISATA BERBASIS KENAMPAKAN TANJUNG DAN FENOMENA SHEETING JOINT TANJUNG LELAPIDE PULAU SANGIHE SULAWESI UTARA Rachmadhan, H.D.; Adam, H.E.S.; Djaya, J.H.M.
Journal Geological Processes, Risks, and Integrated Spatial Modeling Vol 2 No 1 (2024): Journal Geological Processes, Risks, and Integrated Spatial Modeling
Publisher : LPPM Universitas PRISMA

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Geotourism is increasingly popular in modern tourism because it allows tourists to understand and appreciate the unique geological features of a region. This study aims to explore the geotourism potential based on the cape landscape and sheeting joint phenomenon on Sangihe Island, North Sulawesi. Focusing on a case study of Cape Lelapide, the research involves field surveys, rock descriptions, joint structure analysis, geotourism analysis, and literature review. The research findings indicate that Sangihe Island has significant geotourism potential due to its stunning cape landscapes and sheeting joint phenomenon. The cape landscapes offer beautiful natural scenery, while the sheeting joint phenomenon provides evidence of tectonism based on previous studies. Tectonic features are indicated by the predominant N1200E orientation of joints from 100 measurements, interpreted as resulting from northwest-southeast directed stress, suggesting the subduction of the Philippine Plate beneath the Eurasian Plate (Molucca Sea Suture). Rock distribution at Cape Lelapide includes lava igneous rocks and occurrences of Calcite Vein and several vesicular structures indicating ancient volcanic activity of Sandarumang during the Quaternary-Tertiary period. Geotourism assessment highlights significant potential across various aspects, including scientific research, education, tourism, and risk degradation. With high value in scientific and educational aspects, coupled with promising tourism potential, this location is attractive for research and learning. However, attention is needed to address degradation risks, particularly due to its coastal location exposed to high wave erosion and inadequate legal protection.
GEOLOGI DAERAH MINAWEROT DAN SEKITARNYA, KECAMATAN KAUDITAN, KABUPATEN MINAHASA UTARA, SULAWESI UTARA Luntungan, Paskah Richo; Budiharso, Agus Santoso; Rachmadhan, H.D.
Journal Geological Processes, Risks, and Integrated Spatial Modeling Vol 2 No 2 (2024): Journal Geological Processes, Risk and Integrated Spatial Modeling
Publisher : LPPM Universitas PRISMA

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The research location is administratively in North Sulawesi Province, precisely in Kaima Village, Lembean Village, Kaasar Village and Treman Village, Kauditan District, North Minahasa Regency. It is located at the coordinates of 1°16'0"N to 1°17'45"N and 125°01'15"E to 125°03'15"E with an area of 16 km². Along with the improvement of technology and science about the earth along with the increase in the important role of geological maps, the existing updates to the geological map of Minawerot Region, Kauditan District, North Minahasa Regency, North Sulawesi Province with a larger scale of 1:10,000 meals will be able to produce more detailed geological maps to support exploration activities and development programs in the region. In this study, the researcher will identify the geological conditions that develop in the research area which include geomorphological aspects, stratigraphic aspects, geological structure aspects, and geological history aspects so as to produce geological maps, geomorphological maps and stratigraphic columns in the research area. The research method used is a field survey by directly observing the surface geological conditions in the research area which includes geomorphology, stratigraphy and geological structures. The geomorphology of the research area consists of 6 geomorphological units, namely Dissected Volcanic Hills, Volcanic Fluvial Plains, Volcanic Foothills, Eroded Hills, Volcanic Foothills and Lakes. The stratigraphy that developed in the research area consisted of the oldest to the youngest units, namely the Karegesan Andesite Igneous Rock Unit, the Kaima Tuff Breksi Unit, the Tuff Treman Breksi Repeating Unit, the Kaasar Lapili Tuff Unit and the Aluvial Unit. The structure in the research area is only obtained from primary geological structures. After pulling the straightness of the ridge and valley through the DEMNAS, the dominant direction was found, namely the Northwest and Southeast. The geological history that occurred in the research area began with the formation of the Karegesan Andesite Igneous Rock Unit, which was then continued with the deposition of the Tuff Kaima Breksi Unit and then the Tuff Kaima Breksi Repeating Unit. Then it was continued with the deposition of the Kaasar Lapili Tuff Unit and the last one was deposited the Aluvial Unit in the form of loose sediment
Fasies Gunungapi Soputan, Daerah Kilometer Tiga Dan Sekitarnya, Kecamatan Amurang, Kabupaten Minahasa Selatan, Sulawesi Utara Tandipajung, Jeremy; Rachmadhan, H.D.
Journal Geological Processes, Risks, and Integrated Spatial Modeling Vol 2 No 2 (2024): Journal Geological Processes, Risk and Integrated Spatial Modeling
Publisher : LPPM Universitas PRISMA

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This research was conducted to reveal the geological characteristics and facies of volcanoes in the Kilometer Three area and its surroundings, Amurang District, South Minahasa Regency, North Sulawesi. The research area is part of Mount Soputan, one of the active volcanoes in North Sulawesi, which shows complex volcanic dynamics due to tectonic interactions between the Eurasian Plate and the Maluku Sea. Research methods include field surveys, geomorphological observations, geological mapping, petrographic analysis, and evaluation of geological structures. The results of the study identified four main geomorphological land forms, namely volcanic foothills, volcanic foothills, denunated volcanic hills, and fluvial plains. The stratigraphy in this area consists of six rock units, including alluvial units, lapili tufts, volcanic brecci, and porphyry andesite, reflecting variations in volcanic deposition and erosion processes. Analysis of geological structures reveals the presence of structures that develop due to intensive tectonic activity. Based on the distribution of volcanic materials and stratigraphic characteristics, this area is classified into the distal facies of Mount Soputan, which is characterized by the dominance of pyroclastic materials such as tuff and breccia. The geological potential of this area includes abundant stone mining resources, but it is also accompanied by geohazard risks such as landslides due to steep slope morphology and unconsolidated materials.
Karakteristik Geomorfologi dan Stratigrafi Daerah Lambak , Kecamatan Ratatotok, Sulawesi Utara Kakambong, Stela; Rachmadhan, H.D.
Journal Geological Processes, Risks, and Integrated Spatial Modeling Vol 2 No 2 (2024): Journal Geological Processes, Risk and Integrated Spatial Modeling
Publisher : LPPM Universitas PRISMA

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This study was conducted in Lambak District, Ratatotok District, Southeast Minahasa Regency, North Sulawesi, to identify geomorphological and stratigraphic characteristics that reflect the complex geological history of the area. The methods used include geomorphological mapping, field observations, and petrographic analysis. The study area has two main geomorphological origins: structural and denudational. Structural forms include hills controlled by geological structures such as faults and folds, while denudational forms are dominated by hills resulting from intensive erosion processes. The stratigraphy of this area includes alluvial units, limestone (packstone and crystalline), and andesite intrusions. These units show a geological history that is closely related to tectonic and volcanic activity in the Sangihe magmatic arc during the Middle Miocene. The river drainage patterns in the study area, such as parallel, sub-dendritic, and trellis patterns, are strongly influenced by the geological structure and lithology of the rocks. The results of this study provide an important contribution to understanding the potential of geological resources, including mineralization and groundwater, as well as mitigating the risk of natural disasters such as landslides and tectonic deformation. The data produced is expected to support sustainable exploration of natural resources in this region.
Co-Authors Adam, H.E.S. Budiharso, Agus Santoso Djaya, J.H.M. KADIR, ALVYUS Kakambong, Stela Luntungan, P. B. G. Luntungan, Paskah Richo Mewengkang, Berliano Momongan, Andrew Tandipajung, J. Tandipajung, Jeremy