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All Journal JLBG (Jurnal Lingkungan dan Bencana Geologi) (Journal of Environment and Geological Hazards) Buletin Sumber Daya Geologi Academia Praja : Jurnal Ilmu Politik, Pemerintahan dan Administrasi Publik Budapest International Research and Critics Institute-Journal (BIRCI-Journal): Humanities and Social Sciences Journal of Geoscience Engineering and Energy (JOGEE) Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
Nana Sulaksana
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Religion Arts Humanities Chemistry Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Physics Social Sciences

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Peningkatan Aktivitas Vulkanik Gunung Api Slamet dan Pengaruhnya Terhadap Sistem Panas Bumi Mamay Surmayadi; Hanik Humaida; Cahya Patria; Adjat Sudrajat; Nana Sulaksana; Mega Fatimah Rosana
Jurnal Lingkungan dan Bencana Geologi Vol 6, No 3 (2015)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3909.142 KB) | DOI: 10.34126/jlbg.v6i3.87

Abstract

ABSTRAKSejak awal Maret 2014 status aktivitas Gunung Api Slamet di Jawa Tengah dinaikkan dari normal (level I) menjadi waspada (level II) seiring dengan peningkatan jumlah gempa vulkanik. Seismisitas Gunung Api Slamet yang dipantau melalui empat stasiun seismik memperlihatkangempa letusan terekam sebanyak 1.106 kejadian dengan rata-rata 73 kejadian per hari, gempa hembusan terekam sebanyak 6.857 kejadian dengan rata-rata 457 kejadian per hari, sedangkan gempa vulkanik dalam (VA) hanya terekam sebanyak 2 kali selama periode Maret – Agustus 2014. Sumber gempa tersebut berada pada kedalaman antara 1 - 2 km di bawah kawah Gunung Api Slamet sebagai indikasi gempa permukaan. Peningkatan aktivitas magmatik tersebut menghasilkan pelepasan gasCO2 yang berpengaruh terhadap fluida panas bumi yang ditunjukkan dengan terjadinya perubahan keasaman air dari normal menjadi alkalin, pembentukkan bualan gas CO2 pada air panas Pancuran 3 di Baturraden, dan peningkatan saturasi kalsit. Bualan gas CO2 pada air panas Pancuran 3 menjadi indikasi terjadinya proses pendidihan pada temperatur 273° C pada elevasi kedalaman 454 m dibawah permukaan laut. Kondisi ini menjadikan temperatur reservoar menjadi lebih tinggi sebagai indikasi bahwa sistem panas bumi Gunung Api Slamet merupakan sistem panas bumi aktif (active geothermal system) bertemperatur tinggi (high enthalpy).Kata kunci : bualan gas, fluida panas bumi, gempa permukaan, saturasi kalsitABSTRACTSince the beginning of March 2014 the activity status of The Slamet Volcano in Central Java has been declared from normal (level I) to become alert (level II) due tosignificant increase in the number of volcanic earthquakes. The Slamet Volcano seismicity monitored by four seismic stations shows eruption earthquakes as many as 1,106 events with an average of 73 events per day, gas emission earthquakes as many as 6,857 events with an average of 457 events per day, whereas the deep volcanic (VA) earthquake recorded only 2 times during the period of March to August 2014. The hypocentre of these earthquakes was at a depth of 1-2 km below Slamet Volcano crater as an indication of surface earthquakes. Increased magmatic activity resulted in the release of CO2 gas effect on the geothermal fluid indicated by changes in water acidity from normal to alkaline, formation of CO2bubblegas on Pancuran 3 hot springat Baturraden area, and calcite saturation enhancement. The presence of CO2 bubble gas on Pancuran 3 hot springis an indication of a boiling process at the temperature of 273° C at a depth of 454 m below sea level. This condition makes the reservoar temperature becomes higher as an indication that the geothermal system of The Slamet Volcano is an active geothermal systemwith high temperature (high enthalpy).Keywords: bubble gas, geothermal fluid, surface earthquake, calcite saturation
The Effect Of Rainfall Relationship periode 2003 – 2013 Of Groundwater South Jakarta Region Arini Dian; Nana Sulaksana; A. Asseggaf
Jurnal Lingkungan dan Bencana Geologi Vol 11, No 3 (2020)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34126/jlbg.v11i3.301

Abstract

ABSTRAKKebutuhan air bersih di Jakarta sangat meningkat sehingga pemerintah daerah mulai melakukan pengamatan muka airtanah. Penelitian ini dilakukan dengan menganalisis fluktuasi muka airtanah pada AWLR, intensitas curah hujan, dan penampang bawah permukaan pada beberapa buah titik logbor selama tahun 2003 - 2013 di wilayah Jakarta Selatan. Jumlah curah hujan di daerah penelitian berkisar antara 0,2 - 831,4 mm/bulan. Dari data AWLR dapat diketahui ketinggian muka airtanah berkisar antara 9,29 - 13,97 m aml, terdangkal terjadi pada bulan Oktober - Febuari (ketika musim penghujan) dan ketinggian muka airtanah terdalam berkisar antara14,60 - 20,41 m aml terjadi pada bulan Maret - September (ketika musim kemarau). Penelitian ini dilakukan untuk mengidentifikasi adanya pengaruh hubungan curah hujan dan muka airtanah dengan karakteristik sistem akuifer yang berada pada daerah penelitian sekitarnya khususnya di Jakarta Selatan. Berdasarkan analisis tenggang waktu dan fluktuasi muka airtanah yang dipengaruhi oleh intensitas curah hujan.Serta adanya lapisan akuitar pada penampang geologi dan posisi muka airtanah yang terdapat dibagian atas lapisan akuifer, maka dapat dikatakan bahwa sistem akuifer yang terdapat di daerah penelitian bersifat semi tertekan. Sistem akuifer tersebut pada bagian atasnya merupakan material berbutir halus (akuitar) sehingga airtanah masih memungkinkan untuk bergerak di dalamnya.Kata kunci: airtanah, AWLR, curah hujan, fluktuasi, JakartaABSTRACTThe need for clean water in Jakarta has increased significantly, so the groundwater levels of Jakarta Groundwater Basin need to be researched. This research was conducted by analyzing the fluctuation of the groundwater level using the AWLR data, rainfall intensity, and subsurface sections to several logbor during the year of 2003 - 2013 in South Jakarta area. Rainfall event in the area is in range of 0.2 mm/year up to 831.4 mm/year. From the AWLR data, the highest groundwater level were at 9.29 - 13.97 masl in October - Febuari (during rainy season) and the deepest groundwater level were at 14.60 - 20.41 masl) in March - September (during dry season). Based on the analysis of the timescale and the groundwater level fluctuations that influenced by rainfall, and the aquitard layer in the geology section, and groundwater level exist above the aquifer, so that the aquifer system in this regions is classified as semi depressed aquifer. In this aquifer system, the underlying material is fine grained (aquitard) that allows groundwater moving inside the layer.Keywords: groundwater, AWLR, rainfall, fluctuation, Jakarta
The Influence of Open Selection and Official Competence in Filling Primary High Leadership Positions on the Organizational Performance of Regional Apparatus in East Belitung Regency Mudiarsono Mudiarsono; Nana Sulaksana; Budi Muljana
Budapest International Research and Critics Institute-Journal (BIRCI-Journal) Vol 4, No 2 (2021): Budapest International Research and Critics Institute May
Publisher : Budapest International Research and Critics University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33258/birci.v4i2.1875

Abstract

The Merit System and the available options are applied in many Agencies, Institutions and Local Governments to get the best Human Resources. The objectives of this research was to ascertain the impact of open selection and competence on the performance of regional apparatus organizations in the East Belitung Regency. This study employs an explanatory approach with a quantitative approach, analyzing data using descriptive statistics and multiple linear regression. The findings indicated that open selection had a major impact on organizational performance in part. Meanwhile, integrity has a major effect on organizational success on a partial basis. Simultaneous effects of open selection and competence on organizational efficiency are also important.
RESPONSE OF STABLE OVERALL SLOPE GEOMETRY OF OPEN PIT COAL MINE IN WARUKIN FORMATION TO DEWATERING AND PEAK GROUND SEISMIC IN SOUTH KALIMANTAN, INDONESIA Agus W Oscar; Ir. H. Dicky Muslim M.Sc.; Nana Sulaksana; Febri Hirnawan
Buletin Sumber Daya Geologi Vol. 11 No. 1 (2016): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (22443.505 KB) | DOI: 10.47599/bsdg.v11i1.10

Abstract

Understanding of the response of the mine slope stability is very important regarding the safety of life and investment / productivity / environment, as anticipation of landslide prevention based on the latest research. Mine slope behavior previously discussed widely in terms of the response due to dewatering and seismic (Peak Ground Acceleration) as well through verification. This paper aims to obtain a broad dimension of design criteria that are not only unstable slopes, but the slope is stable under various conditions of the rock mass saturation (dewatering) and seismic condition. Response of slope stability per geotechnical rocks unit from different formations or any engineering formation as a result of environmental influences, for example, the same quake, will be different. This means that the geometry of the same slope in other formation will have different stability conditions (safety factor of the slope) due to the same seismic acceleration. This is also similar due to dewatering. The method used for this study is the deductive-probabilistic method with a hypothetical verification approach. The Standard statistical analysis is used to test the data normality and homogeneity, average and independent differences, as well as regression-correlation test. The research results show that dewatering activitycan decrease ground water level (GWL/MAT) of the slope, so the durability of sliding along the sliding plane is reduced (increasing slope safety factor). At the same time earthquake reduces shear strength and increases driving force, so the safety factor of the slope suddenly downs. Slope stability decreased due to the earthquake, but dewatering improves slope stability. Thus, the slope in dewatering conditions will be kept stable through simulation to anticipate earthquake.
PERANAN KOMUNITAS LOKAL DALAM PERENCANAAN PENGEMBANGAN GEOSITE DI KAWASAN GEOPARK BELITONG Yuspian Djapani; Nana Sulaksana; Budi Muljana
Academia Praja : Jurnal Ilmu Politik, Pemerintahan, dan Administrasi Publik Vol 4 No 1 (2021): Jurnal Academia Praja
Publisher : Universitas Jenderal Ahmad Yani

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36859/jap.v4i1.268

Abstract

This research is aimed to determine how the local community as geosite operator in making geosite development planning in Belitong Geopark. The research method is a descriptive study with a qualitative approach where the local community becomes the main source of research information. This research is not based on hypothetical but operational definition concepts analysis that have been formulated based on research questions. However, the mathematical analysis is used through the “Weight Scoring System” Technique or weighted assessment system to analyze the patterns and meaning of relationships between the categories. Meanwhile, a review of the literature is still undertaken to determine the theories that have been applied in related research. Data is collected by the observation techniques, documentation, and interviews. This research was conducted in 4 (four) Geosite locations: 1) Bukit Peramun Geosite in Sijuk Sub-District of Belitung Regency, 2) Juru Sebrang Geosite in Tanjungpandan Sub-District of Belitung Regency, 3) OpenPit Namsalu Geosite in Kelapa Kampit Sub-District of East Belitung Regency and 4) Tebat Rasau Geosite in Simpang Renggiang Sub-District of East Belitung Regency. With the purposive sampling technique, there are 16 respondents that are distributed in proportionately for every research location. The study have found that local communities generally have a good ability to structure and formulate Geosite development planning but still have to enhance in the future by optimizing knowledge, participation and development planning skill through human resource development (HRD) strategies in geosite management in accordance with the top 10 focus area of UNESCO Global Geopark.
PENDUGAAN STRUKTUR BAWAH PERMUKAAN DI DAERAH BAGIAN TENGAH DAS CISADANE DENGAN MENGGUNAKAN DATA GRAVITY Suherman Dwi Nuryana; Novi Triany; Dyah Ayu Setyorini; Karyono HS; Nana Sulaksana; Emi Sukiyah
Journal of Geoscience Engineering & Energy (JOGEE) VOLUME 1, NOMOR 2, AGUSTUS 2020
Publisher : Universitas trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3153.907 KB) | DOI: 10.25105/jogee.v1i02.7685

Abstract

Daerah Aliran Sungai (DAS) Cisadane merupakan wilayah yang pembangunannya berkembang sangat pesat. Tingginya aktivitas pembangunan tersebut menjadikan pemahaman kondisi bawah permukaan aliran sungai Cisadane perlu untuk dipelajari. DAS Cisadane termasuk dalam Cekungan Jakarta bagian Barat, tersusun oleh endapan aluvium, delta dan material gunungapi serta batuan tua yang berumur Tersier. Tujuan penelitian untuk mengetahui struktur bawah permukaan yang ada di bagian tengah DAS Cisadane. Metode gaya berat digunakan untuk mengidentifikasi keberadaan struktur bawah permukaan berdasarkan kontras densitas batuannya. Analisis struktur bawah permukaan dilakukan melalui interpretasi dari peta anomali Bouguer dan anomali residual serta model dua dimensi gayaberat. Hasil penelitian mempelihatkan nilai anomali Bouguer antara 47.0 sampai 70.4 mGal. Anomali di bagian utara dan selatan relatif lebih rendah daripada bagian tengah, menunjukkan bahwa basement di bagian utara dan selatan lebih dalam dibandingkan di bagian tengah. Penampang model gayaberat dibuat dalam 3 lapisan, dengan densitas 1.9 mGal berupa sedimen kuarter, 2.2 mGal sedimen Tersier dan batuan dasar 2.67 mGal. Pola struktur bawah permukaan DAS Cisadane bagian tengah berupa sesar mendatar yang berarah baratlaut-tenggara.
Perubahan Iklim Danau Bandung Purba Berdasarkan Analisis Palinologi, Daerah Cihideung, Lembang, Jawa Barat Rizki Satria Rachman; Winantris Winantris; Budi Muljana; Nana Sulaksana
Jurnal Geologi dan Sumberdaya Mineral Vol. 21 No. 1 (2020): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v21i1.404

Abstract

IClimate is the prevailing weather condition of an area throughout the year. Climate affects the vegetation in a region. The research aimed to study the climate and humidity change during the Holocene in Bandung Paleo-Lake based on palynomorph analysis. The twenty-four samples were taken using hand drill in 172.5 - 52.5 cm depth, continued with preparation and determination. In this study, descriptive analysis and comparison between pollen, spores and their sediments to show the climate and humidity change in Bandung Paleo-Lake. The results show that the samples which were taken on peat deposits showing four times climate changes in five zones, which characterized by montane forest pollens, i.e. Podocarpaceae and Pinaceae, lowland forest pollen i.e. Commelinaceae, Moraceae, spores from the Family Polypodiaceae, Pteridaceae and Dennstaedtiaceae, and Gramineae at the study area.Keywords: Climate, palaeo, analysis, palinology, Bandung Lake.
Optimization of Limestone Production Based on Geological Structure Conditions for Blasting Geometry Design Fachrur Reza Assegaff; Cipta Endayana; Nana Sulaksana; Dwi Putranto Waloeyo
Jurnal Geologi dan Sumberdaya Mineral Vol. 21 No. 2 (2020): JURNAL GEOLOGI DAN SUMBERDAYA MINERAL
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v21i2.483

Abstract

The research location is in Sumber Arum, a village in Kerek District, Tuban Regency, East Java. The object of this study includes the state of the geological structure around the mining site and its effect on blasting activities. The purpose of this study is to obtain a blasting geometry design that is suitable for the geological structure conditions at the mining site so that the resulting blasting fragmentation has a uniform size to increase the amount of company production. The method used in this study is to combine data from measurements and observations in the field with blasting design theory. From these data, further analysis and trial blasting activities are conducted and the results obtained from the actual blasting plan with the proposed blasting plan are compared. The calculation results of the blasting geometry design obtained the proposed blasting geometry values, including the burden of 2.5 meters, the spacing of 3 meters, the stemming of 1.75 meters, the subdrilling of 0.5 meters, the shot hole depth of 6.5 meters, and the direction of the explosion of 6.5 meters that is located at point N37ºE. Based on the application, the blasting fragmentation with a size of ≤ 80 cm is evenly distributed, with a percentage of 99.44% of the total fragmentation resulting from blasting. The amount of limestone produced in one year is 20.138.946 tons.Keywords: blasting geometry, production, limestone, geological structure
Karakteristik Morfotektonik Terhadap Kemunculan Manifestasi Panas Bumi di Daerah Gunung Seulawah Agam, Kabupaten Aceh Besar, Provinsi Aceh Zakia Lukman; Nana Sulaksana; Dewi Gentana; Murni Sulastri
Jurnal Geologi dan Sumberdaya Mineral Vol. 23 No. 2 (2022): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v23i2.593

Abstract

Subduksi antara Lempeng Samudra Indo-Australia dan Lempeng Benua Eurasia membentuk Indonesia berada di wilayah cincin api yang memiliki potensi panas bumi yang besar. Gunung Seulawah Agam dan sekitarnya, Kabupaten Aceh Besar, Provinsi Aceh, dipilih sebagai daerah studi dikarenakan memiliki manifestasi panas bumi di permukaan, mengindikasikan daerah tersebut memiliki potensi panas bumi. Metode yang digunakan dalam penelitian ini yaitu analisis pengindraan jauh dan perhitungan variabel morfotektonik dengan menggunakan peta Rupa Bumi Indonesia (RBI) dan citra Digital Elevation Model Nasional (DEMNAS). Tujuan penelitian untuk mengetahui pola utama kelurusan geologi dan tingkat aktivitas tektonik yang menggambarkan karakteristik morfotektonik dan hubungannya terhadap kemunculan manifestasi panas bumi di daerah studi. Karakteristik morfotektonik di daerah ini menunjukkan daerah yang mengalami tingkat pengangkatan rendah hingga tinggi (nilai Vf ; 0,47 – 1,24), terdeformasi dan tidak terdeformasi (nilai Rb ; 2,98 – 6,27), memiliki tingkat aktivitas tektonik sedang hingga aktif (nilai Smf ; 1,07 – 2,07) dan kerapatan kelurusan rendah hingga tinggi (Ld ; 0 – 1,51 km-1). Kemunculan manifestasi panas bumi permukaan terdapat pada tepi dan perpotongan kelurusan-kelurusan struktur geologi (patahan) yang memiliki pola utama berarah baratlaut - tenggara. Daerah tersebut merupakan daerah yang memiliki kerapatan kelurusan sedang hingga tinggi dan tingkat aktivitas tektonik sedang hingga aktif. Katakunci: Morfotektonik, manifestasi panas bumi permukaan, pola kelurusan geologi
Co-Authors A. Asseggaf Adjat Sudrajat Agus W Oscar Arini Dian Budi Muljana Cahya Patria Cipta Endayana Dewi Gentana Dicky Muslim Dwi Putranto Waloeyo Dyah Ayu Setyorini Emi Sukiyah Fachrur Reza Assegaff Febri Hirnawan Hanik Humaida Karyono HS Mamay Surmayadi Mega Fatimah Rosana Mudiarsono Mudiarsono Murni Sulastri Novi Triany Rizki Satria Rachman Suherman Dwi Nuryana Winantris Winantris Yuspian Djapani Zakia Lukman