Wahju Krisna Hidajat
Program Studi Teknik Geologi Universitas Diponegoro, Semarang, Jawa Tengah

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PENGARUH KENAIKAN AIR LAUT PADA EFEKTIFITAS BANGUNAN UNTUK PERLINDUNGAN PANTAI KOTA SEMARANG Hakim, Buddin A; Suharyanto, Suharyanto; Hidajat, Wahju Krisna
BULETIN OSEANOGRAFI MARINA Vol 2, No 3 (2013): Buletin Oseanografi Marina
Publisher : BULETIN OSEANOGRAFI MARINA

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Abstract

Adanya interaksi lautan dan daratan akan berpengaruh terhadap kondisi Pantai, Perairan Semarang yang berbatasan langsung dengan laut lepas berpotensi terjadi abrasi akibat dari energi gelombang yang mengenai daratan, faktor kenaikan air laut sebagai pengaruh dari perubahan iklim secara langsung akan mempengaruhi luasan abrasi yang terjadi. Penelitian bertujuan untuk mengetahui proyeksi kenaikan air laut, memperkirakan daerah abrasi serta mengetahui efektifitas bangunan groin dalam menanggulangi abrasi di Pantai Semarang. Identifikasi daerah abrasi dan tingkat efektifitas penanggulangan abrasi dilakukan dengan pemodelan menggunakan software CEDAS 2.01 sedangkan analisis spasial menggunakan software ArcGIS 9.3, sebagai inputan model data didapatkan dari analisis data Angin dan data pasang surut Kota Semarang serta survei data lapangan mengenai morfologi pantai dan kondisi sedimen di lokasi penelitian. Dari analisis data Pasang Surut didapatkan Proyeksi Kenaikan Muka Air Laut di Perairan Semarang diberikan dengan persamaan regresi y = 8,8209 x – 17367, R2 = 0,9453, dengan nilai kenaikan air laut sebesar 7.806 cm/tahun. Dari Hasil pemodelan didapatkan bahwa jika tidak ada upaya perlindungan yang dilakukan di Pantai maka pada tahun 2015 dilokasi penelitian akan mengalami abrasi sebesar 116.307 m2 dan meningkat pada tahun 2020 sebesar 174.593 m2 dengan lokasi abrasi berada di Kelurahan Jerakah, Tugurejo Karanganyar, Randu Garut, dan Kelurahan Mangkang Wetan, sedangkan dari skenario penambahan bangunan pantai jenis groin untuk menanggulangi abrasi didapatkan bahwa pembangunan Groin dengan jarak yang semakin pendek antara groin satu dengan yang lainnya lebih efektif dalam menanggulangi abrasi pantai di lokasi penelitian dibandingkan dengan pembangunan Groin yang panjang tetapi jarak antar groinnya terlalu panjang.   Kata Kunci : Kenaikan Air Laut, Prediksi Daerah Abrasi, Efektifitas Bangunan, Pantai Semarang
ANALISIS PETROFISIKA DENGAN METODE DETERMINISTIK DAN PROBABILISTIK SERTA PERHITUNGAN VOLUME HIDROKARBON DENGAN METODE WELL BASIS PADA SUMUR MG-04 DI STRUKTUR MUSI, CEKUNGAN SUMATERA SELATAN PT. PERTAMINA EP REGION SUMATERA Sari, Mega; Nugroho, Hadi; Hidajat, Wahju Krisna; Satriawan, Oki
Geological Engineering E-Journal Vol 5, No 1 (2013): Volume 5, Nomor 1, Tahun 2013
Publisher : Geological Engineering E-Journal

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Abstract

Well logging is a measurement technique to obtain the subsurface data using instrument inserted intowellbore, to evaluate formation and rock characteristics identification beneath the surface. Formation evaluationaims to identify zones of reservoir rock, formation fluid type, and to obtain petrophysical parameters of reservoirrocks such as shale volume, rock porosity, permeability, water saturation at the research area, the well MG-04 weredrilled in the Musi Structure, South Sumatra Basin, PT. Pertamina EP. The purpose of this research is identifying productive layer on an exploration well in Musi Structure, SouthSumatra Basin. In addition, to determine the value of petrophysical rock parameters which recorded in a log curvesgenerated during logging and calculating the volume of hydrocarbon in exploration well as a consideration, priorto further exploration and exploitation. This research using descriptive methods and petrophysical analysis. The descriptive method includesliterature study of the basics concept on determining rock petrophysical parameters to be used. The analyticalmethod using deterministic and probabilistic method to determine petrophysical parameters, also “well basis”method to calculate the volume of hydrocarbons. Based on wireline logs analysis, well MG-04 known has two reservoir zones, namely oil reservoir in zone 2and gas reservoirs in zone 4. In zone 2, the reservoir rock is shaly sandstone with little amount of glauconite. Inzone 4, the reservoir rock is limestone, so this is a necessary to analyze the shaly sandstone with different methodsto the interpretation of limestone to obtain the correct value of petrophysical parameters. After calculation ofpetrophysical parameters in deterministic and probabilistical way with “wet-clay” models, obtained two log plotmodels that have close values, and it is known that the oil reservoir in zone 2 not potential for production, but gasreservoir in zones 4 the potential to do exploitation/ production. After the interpretation of petrophysicalparameters, it is known in zone 4 has a net pay thickness 68.43 m, total porosity percentage 28.42 to 29.72%,effective porosity 25.57 to 26.32%, permeability 56376,2 mD, water saturation 13.49 to 15.35% and shale volume 5to 10.5%. After obtaining reservoir petrophysical parameters, next step is hydrocarbon volume calculation using the“well basis” method, supported by pressure build up (PBU). Based on this analysis, it is known that total volume ofgas in the reservoir hydrocarbon type is estimated at 5088.4 MMSCF.
EKSPLORASI HIDROKARBON DENGAN METODE GEOLISTRIK KONFIGURASI SCHLUMBERGER DAN KONSEP ANISOTROPI, LAPANGAN RA, WILAYAH BENAKAT BARAT, KECAMATAN BENAKAT, KABUPATEN MUARA ENIM, SUMATERA SELATAN Andryantoro, Rio; Hidajat, Wahju Krisna; Widiarso, Dian Agus; Triyono, F.X. Yudi
Geological Engineering E-Journal Vol 6, No 1 (2014): Volume 6, Nomor 1, Tahun 2014
Publisher : Geological Engineering E-Journal

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Abstract

Oil and gas energy still being a high priority industry to support economic of Indonesia, either as source of national income and supply the local energy demands. Development of oil productions decreasing year-by-year, so that, new resources and advance production need to be processed immediately. Oil and gas resources in Indonesia still have a high potential to be developed, one of the high-potential location is Sumatera Island. Tectonic processes made the Tertiary-sedimentary basins in the back of volcanics arc (back arc basin) or in the eastern of Barisan Mountains. South Sumatera Basin was one of those sedimentary basin. Research area located in West Benakat, District of Muara Enim.Among various methods of oil and gas explorations, geoelectric method was chose for th research. This method is relatively simple and inexpensive in cost. Exploration was committed with geoelectric-Schlumberger configuration.  Analysis processed with anistopy concept. Area of geoelectric measurements located in RA Field, Benakat Barat Area, South Sumatera. The length was various for each line depends on  total of measurement stations. The distance between each measurement station is 100 meters with measurements extend 1000 meters in length for each station. Lines which analyzed in this research were line B, D, and J with 53 measurement stations in total, 20 in line B, 17 in line D, and 16 in line J. Data calculation processed with Microsoft Excel until value of medium resistivity acquired. After that, result from calculation processes will be used for 2D modelling using Surfer 8.Based on data calculation and 2D modelling, three hydrocarbon procpect horizons have been interpreted, they are Horizon H1 in depth between 255 – 287 meters with medium resisitivity 0,87 – 6,27 Ohm meter, Horizon H2 in depth between 462 – 483 meters with medium resistivity 2,62 – 11,58 Ohm meter, and Horizon H3 in depth between 595 – 615 meters with medium resistivity 3,04 – 16 Ohm meter.
MODEL KONSEPTUAL PERKEMBANGAN DELTA SEPINGGAN, INTERVAL “MFS 1-MFS 5”, BLOK SOUTH MAHAKAM, CEKUNGAN KUTAI, KALIMANTAN TIMUR Permana, Irfandi Oky; Nugroho, Hadi; Hidajat, Wahju Krisna
Geological Engineering E-Journal Vol 6, No 2 (2014): Wisuda Periode Juli - Oktober 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Abstract

The energy demand  are growing by day,  especially in Indonesia, whereas these needs are not matched by the number of oil and gas production in Indonesia. This case is evidenced by the release of Indonesia as a member of an organization of oil exporting countries on October 9-10, 2008 in Vienna (Kompas, 10 October 2008). Thus required a study on the potential of producing hydrocarbon basin that will be expected to meet the energy demand of the oil and gas in Indonesia. One of the basins in Indonesia is the Kutai Basin which is the largest and widest Tertiary Basin in western Indonesia. The study area is located at the South Mahakam, Kutai Basin, East Kalimantan. This study aims to make conceptual model of delta Sepinggan development. The method included analysis of well log analysis method, 2D seismic analysis method, method of data analysis of rock core and biostratigraphic data analysis method. Based on analysis results can be obtained in the form of variations in lithology information on Sepinggan Zone deltaic sequence at intervals of MFS 1-MFS 5 marker are coal, sandstone, shale and limestone.  Process on Sepinggan Delta are regretion process dominated on Early Miocene – Middle Miocene (N4-N14), and transgretion process on Middle Miocene –Late Miocene (N14-N16). Sedimentation process influenced by East Manpatu Fault that increasing accomodation space in Rocky Field area, so sediment layer in Rocky Field area is thicker 60-150 meter than Zahra-Zidane Field area.
PEMETAAN GERAKANTANAH DAN ANALISIS KESTABILAN LERENG DESA GONDANGLEGI, KECAMATAN KLEGO, KABUPATEN BOYOLALI, JAWA TENGAH Wardhani, Fakhlove; Suprapto, Dwiyanto Joko; Hidajat, Wahju Krisna; Ningtyas, Citra
Geological Engineering E-Journal Vol 6, No 1 (2014): Volume 6, Nomor 1, Tahun 2014
Publisher : Geological Engineering E-Journal

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Abstract

Massmovement disaster is very harmful, because it can damage various infrastructure facilities. Gondanglegi villages, subdistricts Klego, Boyolali district, Central Java, an area that suffered massmovement was quite severe in recent years.To find out how prevention of landslides in the study location so that need to do geotechnical investigations surface and subsurface. Surface investigations conducted by geotechnical mapping aimed to find out surface conditions that include geotechnical conditions and the direction of ground motion distribution / landslides. While subsurface investigation conducted by using data from the PT . Selimut Bumi Adhi Cipta form of with core drilling to a depth of 15 meters data which then laboratory testing, and also geoelectric investigation data.From the data results of the investigation like slope geometry, subsurface cross-section, the interpretation of landslide areas and mechanical properties of soil/ rock material slope stability analysis that using softwares like Slide version 8.0  and Phase ver 8.0.Based on the results of the slope stability analysis, slope conditions around the cross-section AA and BB classified as unsafe have a safety factor value ( Fs ) of 0.851 to 1.031. And the area around the cross-section CC is safe, with a factor of safety value ( FS ) at 4.33Type of massmovement that occurs at the study location in the form is rotational slides with a speed that is classified as moderate massmovement caused by high levels of steepness of slopes and thick weathering materials and triggered by rainfall and human activities.Alternative of prevention to do is cut off the top of the slope, cut down slope, installing gabion stone, make some retaining walls and grouting.
PENYELIDIKAN ZONA AKUIFER MENGGUNAKAN GEOLISTRIK METODE SCHLUMBERGER DI SEKITAR PANTAI UTARA KECAMATAN KRAMAT, SURADADI DAN WARUREJA KABUPATEN TEGAL, JAWA TENGAH Setiono, Dedi; Pudjihardjo, Henarno; Hidajat, Wahju Krisna
Geological Engineering E-Journal Vol 6, No 2 (2014): Wisuda Periode Juli - Oktober 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Abstract

Salah satu permasalahan yang sering terjadi di kecamatan Kramat, Suradadi, dan Warureja, Kabupaten Tegal adalah sulitnya masyarakat mendapatkan air bersih untuk kebutuhan industri maupun kebutuhan sehari-hari. Kesulitan tersebut disebabkan karena belum adanya data pendukung untuk dilakukannya pengeboran airtanah sehingga tentunya masyarakat merugi bila hasil pengeboran airtanah mereka belum kunjung menemukan sumber air bersih. Tujuan dari penelitian adalah menentukan zona akuifer, jenis akuifer dan arah aliran airtanah berdasarkan pemetaan hidrogeologi dan pengolahan data geolistrik metode Schlumberger.Geolistrik merupakan metode geofisika yang digunakan untuk mengetahui kondisi geologi bawah permukaan berdasarkan variasi nilai resistivitas  jenis batuannya. Metode yang digunakan pada penelitian ini adalah geolistrik metode Schlumberger, dengan 16 titik pengukuran geolistrik yang tersebar di sekitar pantai utara Kabupaten Tegal. Proses pengolahan data dilakukan menggunakan software IPI2win untuk mengetahui nilai resistivitas sebenarnya beserta kedalamannya.Hasil interpretasi litologi berdasarkan nilai resistivitas batuan, dapat dikelompokkan menjadi lempung air Asin (0,06-0,27 Ωm), lempung air Payau (0,4-0,99 Ωm), lempung air tawar (1,057-9,714 Ωm), lempung pasiran (10,18-19,87 Ωm), pasir (20,44-119,7 Ωm) dan gravel (≥ 124,3 Ωm). Litologi akuifer pada daerah penelitian berupa pasir yang memiliki sifat permeabilitas dan porositas yang baik. Hasil dari nilai resistivitas dibuat penampang geolistrik dan dikorelasikan untuk menentukan letak, dimensi dan jenis akuifer  yang terdapat pada daerah penelitian. Jenis akuifer yang terlihat dari hasil korelasi adalah akuifer bebas, akuifer bocor dan akuifer tertekan. Debit aliran airtanah pada akuifer tertekan pada wilayah penelitian ini adalah 4090,82 m3/hari. Nilai tersebut setara dengan 47,35 liter/detik atau setara dengan 1.493.149,3 m3/tahun.
PENENTUAN ZONA PROSPEK RESERVOIR HIDROKARBON PADA TAHAP EKSPLORASI DENGAN ANALSIS PETROFISIKA FORMASI BATURAJA LAPANGAN “IRFA” BLOK SEKAYU CEKUNGAN SUMATERA SELATAN Septianingrum, Rizky; Nugroho, Hadi; Hidajat, Wahju Krisna; Rachman, Herlina; Heriadji, Yermia
Geological Engineering E-Journal Vol 6, No 2 (2014): Wisuda Periode Juli - Oktober 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Abstract

South Sumatera basin is one of the basin area in Indonesia that has considerable hydrocarbon potential, particularly in the field by IRFA well as the research of the physical properties of a reservoir characteristics including type of lithology, shale volume, porosity, permeability and water saturation value which is fundamental to the activities of oil and gas exploration.The purpose of this research was to determine the physical properties of the reservoir that developed in the areas include shale volume (Vsh), porosity (Ф), permeability (K), water saturation (Sw) zone which in turn can be determined that there is the prospect of hydrocarbon reservoir in the reservoir-3 on the well IRFA-1. The method used is descriptive method is a method that is done from multiple libraries. While the analytical methods used are qualitative analysis and quantitative. Qualitative analysis is to conduct research lithology and correlation of 7 wells located in the study area, while for the quantitative analysis was conducted on the calculation of reservoir petrophysical properties among other shale volume, porosity, permeability and water saturation then be determined net pay identified as areas reservoir will know where is hydrocarbon prospects and the prospects for the determination of hydrocarbon reservoir zones in this study is supported by the chromatograph of analysis done by knowing the value of the total gas C1, C2, C3, iC4, nC4 IRFA-1 well.Based on data analysis and discussion of reservoir-3 well IRFA-1 has a value of shale volume average of 22%, porosity 26%, permeability 371 mD, water saturation of 38%. This calculation is obtained by using a cutoff value for the volume of shale reservoirs <50%, effective porosity >9%, water saturation <60%. The results of the calculation of the average value cromatograph C1 / C2 = 4.14 ppm, C1 / C3 = 7.34 ppm, C1 / C4 = 18.46 ppm, C2 / C3 X 10 = 17.8 ppm. From the results of the data analysis and discussion can be interpreted that the reservoir-3 well IRFA-1 at a depth of 4298.3 to 4353 feet of a reservoir zone with oil prospects.
PENYELIDIKAN GEOLOGI TEKNIK UNTUK PENENTUAN LOKASI PEMBANGUNAN AS BENDUNGAN PELOSIKA DI DESA ASINUA JAYA, KECAMATAN ASINUA, KABUPATEN KONAWE, PROVINSI SULAWESI TENGGARA Kristy, Sawung Kawedar Daya; Nugroho, Hadi; Hidajat, Wahju Krisna; Marhento, Dandung
Geological Engineering E-Journal Vol 6, No 2 (2014): Wisuda Periode Juli - Oktober 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Abstract

Development plan of Dam Pelosika is located in a river Konaweha, Asinua Jaya village, Asinua District, Konawe, Southeast  Sulawesi  Province. Konaweha river has a length of 127 km and has an Regional water bin area of 6,664 km2.The purpose of this research is to study the geology around the River Konaweha to determine the condition of the morphology and lithology of the area so it can be recommended as dam Pelosika construction site of several alternative locations. Then determine the engineering geology condition of the selected location. In addition, determine the spread and water level inundation. The research method used was a descriptive survey method engineering geological mapping. The descriptive method is collecting secondary data from topographic maps, regional geological maps, earth maps and technical data of dams. While the analytical survey method is analyze the data based on the geological conditions of the regional geology and geological engineering investigation of the data included surface geological conditions, core drilling and test results of geoelectric. Based on investigation in the field, the morphological conditions of the studyis divided into three units namely structural denudated steep hills landform unit, denudated structural undulating hills landform unit and plains of fluviall and denudated form unit. The lithology of the study area is a constituent of metamorphic rocks such as schist of Paleozoic Metamorphic Formation, conglomerates and sandstones of Pleistocene age Alangga Formation and deposition of clay to gravel-sized Alluvium Holocene age. Based on several parameters geology and geological engineering, so that from several alternative locations as dam development determined that 4th alternative locations is a selected location for construction Dam Pelosika. The foundation of the dam on the left side at elevation +121 m rests on weathering soil bedrock sandy silt-sized. The foundation of the center of the dam at elevation +16.9 m rests on clay silt layers firm. The foundation of the right of the dam at elevation +115 m rests on weathering soil bedrock sandy silt-sized. The inundation spread area is 165.98 km2, constrained by the topography of the area around the river. Inundation water levels is +180 m.
PENYELIDIKAN GEOLOGI TEKNIK UNTUK PEMBANGUNAN TANGGUL KALI LOROK PACITAN JAWA TIMUR Setiono, Setiono; Suprapto, Dwiyanto Joko; Hidajat, Wahju Krisna
Geological Engineering E-Journal Vol 6, No 1 (2014): Volume 6, Nomor 1, Tahun 2014
Publisher : Geological Engineering E-Journal

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Abstract

Lorok river, Pacitan, East Java is one of the river is located in the south eastern part Pacitan. In this area often flooded due to overflow of river water discharge during the rainy season and at high tide the sea water so that it can be detrimental to the public around the area of research which is along the river flow Lorok. Therefore, the government will undertake the construction of a dike to overcome these problems.In the present study, namely on engineering geology investigation for the construction of levees on the river wall, which aims to determine the condition of the surface geology and subsurface engineering research sites, determine the feasibility of levee, giving advice and know the location, quantity and quality of borrow. So as to provide development planning parameters embankment at the study site.To carry out the construction of the embankment should be known geological conditions of the surface and subsurface techniques. The method used in this study is the investigation of the surface engineering geological and engineering geological mapping subsurface geothecnical investigation with core drilling methods, sondir test and test pit. Mapping of engineering geology carried out in the vicinity of the study. Core drilling carried out by 10 points the BH - 1, BH - 2, BH - 3, BH - 4, BH - 5, BH - 6, BH - 7, BH - 8, BH - 9, BH - 10 with the depth of each point 10 meters. Sondir test conducted by 10 points the SD - 1, SD - 2, SD - 3, SD - 4, SD - 5, SD - 6, SD - 7, SD - 8, SD - 9, SD - 10 with varying depths . In this research, the search pile material in a way to make a well test ( test pit ) by 2 points the TP - 1 and TP - 2. In this investigation will produce approximately engineering geology maps and cross sections of the river flow subsurface engineering geology around the flow of the river.Based on the results of the analysis of the data that had been collected earlier, the recommended embankment foundation planning on hard ground or on rocks. Engineering geology cross-section can show the bedrock or rock beneath the surface as well as the physical and mechanical properties of soil or rock that is on site research.
IDENTIFIKASI PENYEBAB GERAKANTANAH DENGAN PENYELIDIKAN GEOLOGI TEKNIK DAN PENGUKURAN GEOLISTRIK METODE WENNER PADA PERUMAHAN TAMAN SENTOSA DAN SEKITARNYA KELURAHAN SUKOREJO KECAMATAN GUNUNG PATI KOTA SEMARANG Fauzan, Fachry Afif; Rachwibowo, Prakosa; Hidajat, Wahju Krisna
Geological Engineering E-Journal Vol 6, No 2 (2014): Wisuda Periode Juli - Oktober 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Abstract

Salah satu permasalahan yang terjadi di Perumahan Taman Sentosa,Kecamatan Gunung Pati, Kota Semarang dan sekitarnya adalah gerakantanahyang terjadi pada lokasi tersebut yang menjadi lokasi penelitian. Kejadiangerakantanah yang terjadi cukup mengganggu aktifitas masyarakat dan merusakinfrastruktur bangunan serta jalan yang ada. Penyebab dan klasifikasigerakantanah tersebut perlu diketahui secara baik sehingga dapat dilakukanpenanggulangan gerakantanah yang tepat terhadap lokasi penelitian. Tujuan daripenelitian ini adalah menentukan litologi lokasi penelitian, klasifikasigerakantanah, dan penyebab gerakantanah yang terjadi berdasarkan analisispengukuran geolistrik metode Wenner dan pemetaan geologi teknik. Geolistrik merupakan metode geofisika yang digunakan untuk mengetahuikondisi geologi bawah permukaan berdasarkan variasi nilai resistivitas jenisbatuannya. Metode yang digunakan pada penelitian ini adalah geolistrik metodeWenner, dengan 4 titik pengukuran geolistrik yang tersebar di sekitar lokasipenelitian. Proses pengolahan data dilakukan menggunakan software IPI2winuntuk mengetahui nilai resistivitas batuan. Sedangkan pemetaan geologi teknikadalah penyelidikan material permukaan menggunakan peta kontur denganmemperhatikan sifat geologi teknik material dengan hasil akhir berupa petageologi teknik. Hasil interpretasi litologi berdasarkan nilai resistivitas batuan, dapatdikelompokkan menjadi batulempung (< 10 Ωm) dan batupasir (10-100 Ωm) dantidak ditemukan adanya ketidakmenerusan litologi yang menjadi pencirikeberadaan struktur geologi. Sedangkan hasil penyelidikan geologi teknikpermukaan ditemukan pada lokasi penelitian batulempung sisipan batupasir danlempung kepasiran dan tidak ditemukan adanya struktur geologi. Batulempungsisipan batupasir 75% komposisinya memiliki ukuran butir 0,06 mm dan 25%dibawah 0,02 mm. Sedangkan lempung kepasiran terdiri dari 90% komposisilempung dengan ukuran butir dibawah 0,02 mm dan 10% pasir dengan ukuranbutir 0,06 mm.Setelah dilakukan analisis terhadap data-data geolistrik dan geologi teknik yang didapat diketahui bahwa jenis gerakantanah yang terjadi pada lokasipenelitian adalah rayapan (creep) yang disebabkan oleh keberadaan materiallempung pada lokasi penelitian.