scholarly journals Engineering Geology of Sidosari Area, Magelang, Central Java, Indonesia

2017 ◽  
Vol 2 (1) ◽  
pp. 15
Author(s):  
Diyaning Ratri ◽  
I Gde Budi Indrawan
Keyword(s):  
Surface Engineering ◽  
Research Area ◽  
Geological Structure ◽  
Geological Mapping ◽  
Controlling Factor ◽  
Susceptibility Map ◽  
Residual Soils ◽  
Engineering Geological Mapping ◽  
Groundwater Seepage ◽  
Geological Conditions

Development of settlement area in Sidosari area and the surroundings requires complete understanding of the engineering geological conditions, including susceptibility to landslides, to prevent damaged properties and loss of lives. Surface engineering geological mapping at a 1:25000 scale was conducted to develop a detailed landslide susceptibility map for spatial planning and to identify most controlling factor of landslides in the research area based on conditions of geomorphology, rock and soil, geological structure, groundwater seepage, and land use. The engineering geological mapping showed that landslides commonly occurred in the moderate slopes of the denudational hill landform having slope inclination ranging from 9 to 17°, in the areas covered by residual soils of the vitric tuff 2 unit, in the areas of no groundwater seepage, and in the settlement areas, including in Kranjang Lor area where soil creeping occurred. The high susceptibility zone covered 55.5 % of the research area and was characterized by having slope inclinations ranging from 9 to 35°, engineering geological units of vitric tuff 2 and tuff breccia, and land uses of rice and dry fields and settlement. The low cohesion and very high swelling potential of the residual soils of the vitric tuff 2 unit were considered to be the main controlling factor of landslides in the research area.

scholarly journals Evaluasi Kondisi Geologi Teknik dalam Pembangunan Embung

2019 ◽  
Vol 5 (1) ◽  
pp. 121
Author(s):  
I Gde Budi Indrawan ◽  
Shinta Dwi Novianti ◽  
Heru Hendrayana ◽  
Doni Prakasa Eka Putra ◽  
Wahyu Wilopo
Keyword(s):  
Water Source ◽  
Geological Structure ◽  
Source Location ◽  
Geological Mapping ◽  
Engineering Geological Mapping ◽  
Merapi Volcano ◽  
Geomorphic Process ◽  
Geological Conditions ◽  
Detention Pond ◽  
Impermeable Layer

Pucang Village was consisted of eruption materials of Merapi Volcano. The relatively high coefficient of permeability of the materials consisting this area caused rainwater to directly infiltrate into the ground. Evaluation of engineering geological conditions was conducted for construction of a detention pond in this area, which had limited water supply for daily activities. The evaluation was conducted on results of a 1:10.000 scale of engineering geological mapping and analyses of 1:10.000 scale of geological disaster maps produced by previous researchers. The engineering geological mapping involved mapping of morphological condition and active geomorphic process, lithological condition, existence of geological structure, and water source location. The evaluation results showed that the proposed location met the land suitability criteria for detention pond construction based on the morphological condition and active geomorphic process, existence of geological structure, and water source location, but did not meet those based on the lithological and vulnerability to Merapi Volcano eruption disaster. Construction of impermeable layer to prevent water seepage into the ground and periodic removal of sediment in the base of the detention pond were suggested to be carried out to keep the detention pond functioning properly.

scholarly journals Groundwater quality in Ponjong Karst, Gunungkidul Regency, Special Region of Yogyakarta

2020 ◽  
Vol 1 (1) ◽  
pp. 7-11
Author(s):  
Avellyn Shintya Sari ◽  
Sari Bahagiarti K ◽  
Suharsono Suharsono ◽  
C Prasetyadi
Keyword(s):  
Volcanic Rocks ◽  
Active Volcano ◽  
Research Area ◽  
Geological Structure ◽  
Groundwater Exploration ◽  
Geological Mapping ◽  
Karst Area ◽  
Aquifer System ◽  
Aquifer Systems ◽  
Geological Conditions

The hydrogeological condition of a region is determined by the type of lithology, morphology, and subsurface conditions where the condition is very helpful in the study of groundwater exploration. Especially when we encounter interesting geological conditions when the groundwater exploration in the karst area in which volcanic rocks are resulting from the activities of the active volcano in the past. Groundwater exploration at Ponjong area and surrounding does have its special characteristics, because it has 2 different rock characteristics where the northern part of the research area in the form of a karst area (limestone of Wonosari Formation) while the southern part is an area of ancient volcanoes with dominant volcanic rocks from Wuni Formation, As for the research on the above and subsurface research area where the research is conducted based on surface geology mapping, geoelectric data collection, and groundwater sampling. Geological mapping includes geomorphological data, stratigraphy, and geological structure. The aquifer system of the research area can be divided into two systems, inter-grain aquifer systems, and fracture aquifer systems. Overall quality groundwater in the research area is quite good. Ponjong District there are mining activities that have resulted in changes in the land use system in the area. This can cause changes in the water surplus in the area due to the changing catchment area.

scholarly journals Geological Mapping of the Longkeyang and Surrounding Regions, Bodeh District, Pemalang Regency, Central Java

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Irwan Firmansyah ◽  
Adi Candra ◽  
Fajar Rizki Widiatmoko
Keyword(s):  
Middle Miocene ◽  
Research Area ◽  
Geological Structure ◽  
Geological Mapping ◽  
Research Activity ◽  
River Sand ◽  
Geological Disasters ◽  
Central Java ◽  
Geological Conditions ◽  
River Deposits

Geological mapping is one of the important things as part of a field study to obtain geological knowledge. This is due to the need for a geologist who is required to be able to understand the geological conditions of an area, one of which is by conducting mapping activities in the field. In conducting this research activity, it is divided into two stages, namely the field stage and the laboratory stage. The purpose of this research is to determine the characteristics and geological conditions, identify resource potentials and potential geological disasters in the research area. Based on the analysis, it was found that the geomorphological units of the study area were divided into 4 (four), namely the Mount Ketos Homocline Hills Unit, the Polaga River Anticline Valley Unit, the Sarangkadu Cycline Hills Unit, and the Mount Lanji Intrusion Hills Unit. The geology of the study area consists of three rock units in order from oldest to youngest, namely the claystone-sandstone unit and the sandstone-claystone unit and the diorite intrusion unit. The geological structure of the pinnacle area is in the form of folds and faults, namely, Polaga River Anticlines, Sarangkadu Synclines, Polaga River Right Shear Fault, Polaga River Left Shear Fault. The geological history of the study area begins with the deposition of claystone-sandstone units during the Middle Miocene in the Upper Bathyal environment. Furthermore, after the claystone-sandstone units were deposited, during the Middle Miocene – Late Miocene in the Deep Neuritic environment, sandstone-claystone units were deposited with a turbidity deposition mechanism. As well as the geological resource potential of the research area in the form of utilization of river deposits in the form of chunks of igneous rock, river sand deposits and indications of the presence of gold. Meanwhile, the potential for geological disasters in the form of landslides.

scholarly journals Geological mapping and stand-up time estimation based on core drill evaluation using RMR89 on Tunnel 3 Sigli Banda Aceh Toll Road

2021 ◽  
Vol 325 ◽  
pp. 02004
Author(s):  
Hanif Khoirul Latif ◽  
Salahuddin Husein ◽  
I Gde Budi Indrawan
Keyword(s):  
Rock Mass ◽  
Time Estimation ◽  
Research Area ◽  
Geological Mapping ◽  
Drill Core ◽  
Toll Road ◽  
Site Investigations ◽  
Geological Conditions ◽  
Core Evaluation ◽  
Banda Aceh

Tunnel 3 of the Sigli Banda Aceh Toll Road has been designed based on several site investigations. The site investigations have not included surface geological investigations. Subsurface geological investigations have been carried out but with less detailed drill core evaluation. This will cause less accuracy on the assessed tunnel stand-up time. This research aims to evaluate the engineering geological conditions at the tunnel construction site by conducting geological mapping with 1:5,000 scale and re-evaluating drill core using RMR89 method more thoroughly so that it can produce more accurate assessment of the tunnel stand-up time. The geological mapping result shows that the research area has three rock units, namely lapili, tuffaceous sandstones, and interbedded sandstone-siltstones, with moderate to fresh weathering degree. The drill core evaluation shows that research area has poor to good rock mass classes (34 – 67). The drill core evaluation results also indicate possible geological structures that may influence subsurface rock mass strength. The tunnel stand-up time obtained from the lowest RMR89 value for each drill core shows a value of 5 - 90 hours, implying immediate application of support system after tunnel excavation.

scholarly journals Investigation of Aquifer Zone in Tambakromo Village, Ponjong Subdistrict, Gunung Kidul Regency, Yogyakarta, Indonesia

2021 ◽  
Vol 6 (3) ◽  
pp. 216
Author(s):  
Al Hussein Flowers Rizqi ◽  
Oky Sugarbo
Keyword(s):  
Research Area ◽  
Unconfined Aquifer ◽  
Groundwater Exploration ◽  
Geological Mapping ◽  
Petrographic Analysis ◽  
Stratigraphic Correlation ◽  
Geological Conditions ◽  
Drought Disaster ◽  
Limestone Rock ◽  
Geoelectrical Resistivity

The presence of surface water is always being a primary issue in Gunung Kidul regency. An aquifer investigation would support groundwater exploration. The research area is located in Tambakromo village, Ponjong subdistrict, Gunung Kidul Regency, Daerah Istimewa Yogyakarta Province. The aim of this research is about geological and subsurface conditions based on geological data and geoelectrical resistivity methods. By resistivity value interpretation, the position, depth, and thickness of aquifer could be determined. The purpose of this research is to identification of geological conditions that supported being aquifer rock. The method in this research is used geological mapping combined with petrographic analysis. The geophysics method is used to identification of aquifer in research area. Three locations were selected to acquisition geoelectrical resistivity survey. In Grogol village, there is no aquifer based on resistivity values of more than 10000 ohmmeters (andesitic breccia). An akuifuge is interpreted there in andesitic breccia instead of the presence of aquifer. The tuffaceous is interpreted as lapillistone that contained the glass with resistivity value of 43.63 and 340.11 ohmmeters. The Garon and Sumberejo village have aquifer at depth of 50 to 80 meters with a thickness of 13 to 70 meters. The type of aquifer in both area is included an unconfined aquifer, specifically located in between the limestone rock layer and andesitic breccia. By regional stratigraphic correlation, tuffaceous lapillistone is interpreted as derived from Semilir Formation. In addition, the presence of aquifer in research area could recommend for local people and government to reduce the drought disaster.

scholarly journals Engineering geological mapping for empirical design evaluation of Tunnel 10 of Jakarta - Bandung high-speed railway, Indonesia

2021 ◽  
Vol 325 ◽  
pp. 01006
Author(s):  
Hanifah Hilda Herdiana ◽  
I Gde Budi Indrawan ◽  
Hendy Setiawan
Keyword(s):  
Rock Mass ◽  
Support System ◽  
High Speed ◽  
Geological Mapping ◽  
Construction Site ◽  
Engineering Geological Mapping ◽  
High Speed Railway ◽  
Tunnel Support ◽  
Geological Conditions ◽  
Empirical Design

An engineering geological mapping was carried out at the construction site of the Tunnel 10 of Jakarta Bandung High-Speed Railway to obtain data and information of the engineering geological conditions, particularly the rock masses. This research aims to determine the rock mass classes at the tunnel construction site and recommend the tunnel support system based on the Rock Mass Rating (RMR) and the Japan Society of Civil Engineers (JSCE) systems. This research is expected to better understand the rock mass classes, which were previously determined based on the newly applied Basic Quality (BQ) system for the tunnel support empirical design. The results showed that the research area consisted of young volcanic products, namely moderate to highly weathered tuff breccia and andesitic breccia. The uniaxial Compressive Strength (UCS) of rock mass varies between 1-25 MPa. The RMR value ranges from 21 to 40, indicating disintegrated and poor rock mass quality. The proposed tunnel support system is the combination of shotcrete, steel support for top heading and bench support, arch sidewall, and invert concrete.

scholarly journals ΕNGINEERING GEOLOGICAL MAPPING IN THE URBAN AND SUBURBAN REGION OF NAFPLION CITY (ARGOLIS, GREECE)

2017 ◽  
Vol 43 (3) ◽  
pp. 1418 ◽  
Author(s):  
Em. Apostolidis ◽  
An. Koutsouveli
Keyword(s):  
Urban Development ◽  
Laboratory Tests ◽  
Region Of Interest ◽  
Underground Water ◽  
Geological Structure ◽  
Geological Mapping ◽  
Primary Role ◽  
Geotechnical Characteristics ◽  
Geological Conditions ◽  
Geological Map

In our days the strategy of an integrated planning approach in dealing with urban development matters, is a reality and engineering geology plays a primary role. In the present study an approach of the engineering geological conditions of Nafplion city and the wider area are given. In the region of interest, four (4) sampling boreholes were drilled by IGME, up to the depth of 40m. During the boring procedure in situ SPT and permeability tests were carried out, as well as the lithology of obtained material has been described. Samples, undisturbed and disturbed, have also collected for further laboratory tests. After the completion of each borehole, piezometric tubes were installed, for the monitoring of the underground water table. Laboratory tests for the determination of physical and mechanical characteristics of all drilled formations were executed. The geotechnical distinction and unification of the geological forma tions was made on a 1:5,000 topographical map, in accordance with the up to date in ternational practice. The engineering geological map in the urban and suburban region of Nafplion city is presented and the geotechnical characteristics of the formations struc turing the area are evaluated. The combination of the results of the drilling programme as well as on the engineering geological approach and the geological structure of the studied area, resulted the compilation of the engineering geological map (scale 1:5,000) of Nafplion city wide area, where 18 engineering geological types are distinguished. The boreholes data of other public bodies have been also taken into account for this compilation. As the task of this project was the contribution to the urban development of Nafplion city, this engineering geological map will be a useful tool for engineers, planners, civil authorities, etc.

scholarly journals Depositional Environment Analysis Carbonate Rocks in Montasik District

2020 ◽  
Vol 9 (3) ◽  
pp. 72-77
Author(s):  
Fahri Adrian ◽  
Ariadi Putra ◽  
Akmal Muhni ◽  
Marwan Marwan
Keyword(s):  
Carbonate Rocks ◽  
Depositional Environment ◽  
Research Area ◽  
Geological Mapping ◽  
Environment Analysis ◽  
Reef Facies ◽  
Geological Conditions ◽  
Platform Margin ◽  
Facies Zone ◽  
Direct Data

Kecamatan Montasik terdiri dari 2 formasi yaitu Formasi Gunungapi Lam Teuba berumur Pliosen Akhir sampai Plistosen Akhir dan Formasi Anggota Padangtiji berumur Pliosen Awal sampai Pliosen Tengah. Litologi Formasi Anggota Padangtiji terdiri dari konglomerat, batulanau, batupasir gampingan dan batu gamping. Lingkup penelitian ini meliputi kajian tentang kondisi geologi permukaan dan analisis lingkungan pengendapan sedimen karbonat pada lokasi penelitian. Metode yang digunakan dalam penelitian ini yaitu pengambilan data langsung di lapangan dan menganalisis petrologi dan petrografi pada sampel batuan. Litologi pada lokasi penelitian terdiri dari 7 satuan yaitu guguran lava, lava andesit, lapili jatuhan piroklastik, tuf jatuhan piroklastik, konglomerat, batugamping terumbu dan batupasir gampingan. Lingkungan pengendapan sedimen karbonat yang terdapat pada lokasi penelitian terbentuk di laut dangkal (reef) pada kedalaman 0 m - 200 m di bawah permukaan laut. Zona fasies pengendapan batugamping pada lokasi penelitian terendapkan pada zona platform margin sands  dan organic buildups. Sedangkan zona fasies terumbu pada lokasi penelitian terdapat pada zona reef front. Montasik district consists of two formations, Gunungapi Lam Teuba Formation aged Late Pliocene – Late Pleistocene and Padangtiji Member aged Early Pliocene – Middle Pliocene. Lithology of Padangtiji Member consists of conglomerate, siltstone, carbonate sandstone, and limestone.  The scope of this research includes a study of surface geological conditions and depositional environmental analysis of carbonate sediment. The method used in this study is direct data collection in the field and analyzing petrology and petrography in rock samples. Lithology of the research area consists of lava drop, andesit, lapili pyroclastic, tuff pyroclastic, conglomerate, fosilliferous limestone, and carbonate sandstone. Depositional environment in the research area formed at shallow marine (reef) on 0m-200m depth under sea level. Depositional facies zone in the research area is on the margin sands platform zone and organic buildups, while Reef facies zone contained in reef front zone.Keywords: Geological Mapping, Depositional Environment, Carbonate Rocks, Petrography, Montasik

scholarly journals Geodiversity of Menganti Paleo-Volcano: New Insight to Geotourism Potential in Kebumen, Central Java, Indonesia

2020 ◽  
Vol 5 (1) ◽  
pp. 11-24
Author(s):  
Fadlin ◽  
Gentur Waluyo ◽  
Yohanes Iwan ◽  
Nita Ariyanti ◽  
Nanda Ajeng Nurwantari
Keyword(s):  
Quantitative Assessment ◽  
Economic Value ◽  
Research Area ◽  
Field Investigation ◽  
Point Of View ◽  
Geological Mapping ◽  
Qualitative Assessment ◽  
Landscape Models ◽  
Geological Conditions ◽  
Geological Diversity

Karangbolong is a morphological dome in Kebumen area, that has a high geological diversity and have a lot of tourism potential, but has not been developed optimally as a geotourism potential based on conservative and educative aspects, especially the existence of ancient volcano of Menganti the quite interesting from a geological point of view, so in this case an inventory of a geological diversity is required. This study aims to understand the geological conditions and conduct an assessment of the feasibility of geodiversity in ancient volcano complex of Menganti. The methodology for this research is a direct observation in the field based on the surface geological mapping, rock sampling for petrology study of rocks for supporting the quantitative assessment of genocide in the research area. The research area has 2 (two) landscape models, ie,ex-volcanic landscape, in this case occupying 95% of the research area and then the karst landscape, occupying 5% of the research area. Stratigraphy of the research area can be divided into 5 units from old to young, that is basaltic lava of Menganti, the pyroclastic flow of Menganti which is interfingering with andesitic lava of Karangduwur, andesite-basalt intrusion unit, and limestone of Agropeni. Based on field investigation, the research area has 27 geosite objects that can be developed as geotourism potential, covering 3 geomorphological sites, 7 lithology sites, 9 cave karst sites, 5 beach sites, and 2 waterfall sites. Based on the results of quantitative assessment of geosites in the research area with accessibility, state of preservation, scientific wort, and educational significance parameters, the research area has a geodiversity index from 19 until 24, in this case, the research area has good until very good grade to be developed as a geotourism potential base on educative and conservative, in order to improve the economic value of local communities.   Keywords: Qualitative assessment, geodiversity, geotourism, paleo-volcano, Kebumen.

scholarly journals GEOLOGI DAN SUMBER BAHAN BATUAN SITUS CANDI SIRIH, KABUPATEN SUKOHARJO, PROVINSI JAWA TENGAH

2021 ◽  
Vol 19 (1) ◽  
pp. 33-46
Author(s):  
Fadhlan Syuaib Intan
Keyword(s):  
Literature Review ◽  
Natural Environment ◽  
Research Method ◽  
Data Interpretation ◽  
Geological Structure ◽  
Geological Mapping ◽  
Normal Faults ◽  
Surrounding Environment ◽  
Geological Conditions ◽  
The Temple

Candi Sirih merupakan tinggalan budaya dari masa Hindu-Buddha, yang masih cukup lengkap yang terbuat dari batuan tufa, sehingga dianggap sebagai candi yang tidak umum di Pulau Jawa karena menggunakan batuan yang bukan andesit. Hal inilah yang menjadi pokok permasalahan pada penelitian ini, yang mencakup bahan batuan candi dan kondisi geologi secara umum. Maksud dan tujuan penelitian ini adalah pemetaan geologi untuk mengetahui gambaran keadaan lingkungan alam yang mencakup morfologi, litologi, struktur geologi, dan menentukan lokasi pengambilan sumber bahan batuan untuk pembangunan candi. Metode penelitian diawali dengan kajian pustaka, survei, dan dilanjutkan dengan analisis petrologi, dan interpretasi data. Hasil pengamatan lingkungan memberikan informasi tentang bentang alam yang termasuk pada satuan morfologi dataran, dan satuan morfologi bergelombang lemah. Pola pengeringan permukaan dendritik, radial, dan rektangular, stadia sungai dewasa-tua, dan sungai periodik/permanen. Batuan penyusun adalah aluvial, dan satuan batuan tufa serta struktur geologi berupa sesar normal. Penentuan lokasi bahan batuan tufa (kasar. halus, berlapis) dan serpih untuk pembangungan Candi Sirih berasal dari lingkungan sekitarnya dalam radius 3,5 kilometer bujursangkar.   Sirih Temple is a cultural heritage from the Hindu-Buddhist era, which is still quite complete, made of tufa rock, so it is considered an unusual temple in Java because it uses non-andesite rocks. This is the main problem in this study, which includes the material of the temple rock and geological conditions in general. The purpose and objective of this research is geological mapping to determine the description of the state of the natural environment which includes morphology, lithology, geological structure, and determining the location of the source of rock material for the construction of the temple. The research method begins with a literature review, survey, and is followed by petrological analysis and data interpretation. The results of environmental observations provide information about the landscape that is included in the morphological units of the plains, and the weak wavy morphological units. Drying patterns of dendritic, radial, and rectangular surfaces, mature-old river stage, and periodic/permanent river. The constituent rocks are alluvial, and the tuff rock units and the geological structure are normal faults. The location of the tuff (coarse, fine, layered) and shale materials for the Sirih Temple construction came from the surrounding environment in a radius of 3.5 square kilometers.

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