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All Journal Jurnal Penelitian Pendidikan IPA (JPPIPA) JURNAL SUMBER DAYA AIR Jurnal Geofisika Jurnal Geosaintek Tanah Goyang: Jurnal Geosains Tanah Goyang : Journal of Geoscience
Susanti Alawiyah
Applied Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung
Aerospace Engineering Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Energy Engineering Materials Science & Nanotechnology Physics

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Study of Calculation of Terrain Correction Using square pattern and sloped triangle Method in Karangsambung Area Salam, Rafi; Wahyudi, Eko Januari; Alawiyah, Susanti
Jurnal Geofisika Vol 17 No 2 (2019): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36435/jgf.v17i2.412

Abstract

Conventional assessments of terrain correction are carried out by laying out transparent paper containing the Hammer chart on topographic maps, then estimating the elevation for each compartment. But this procedure has disadvantages, the number of compartments are too small for area with many topographic variations, and there is a subjectivity from the observer in estimating the compartments height. This research aim to overcome these problems and get more accurate terrain correction value. In this research, estimation of terrain correction carried out using square pattern and sloped triangle method. This method divides the area around the measurement point into a zone containing a square-shaped and triangle compartment. The research start with testing the program by using synthetic data to see the effect of rock bodies on terrain correction value. Then the program was applied to Karangsambung to see the topographic influence around Karangsambung on terrain correction. The program is then applied to gravity data, and the results are compared with calculations using the Hammer chart. Based on the synthetic data test, it was found that the value of terrain correction from a rock body measuring 10 x 10 km with a height difference of 1000 m from the station no longer significantly affects at the distance of 20 km. The topography around Karangsambung in the form of South Seraju Ranges with altitude of 1000 m at distance of 20 30 km gives effect of 0.05 mGal on terrain correction, while the Quaternary Volcano with an altitude of 3000 m at distance of 30 40 km gives effect of 0.1 mGal. The results of applying program at the gravity data show that the use of the square pattern method is able to correct errors from Hammer chart up to 3 mGal. The difference between the calculation of the two methods is getting bigger in the station located at slope area. It happens because estimation of the height difference in slope area is more difficult to do.
Inversi Gaya Berat Model Talwani Menggunakan Flower Pollination Algorithm Latupeirissa, Pricilia O. M; Bahri, Samsul; Alawiyah, Susanti
Tanah Goyang : Jurnal Geosains Vol 2 No 1 (2024): Tanah Goyang : Jurnal Geosains
Publisher : Program Studi Teknik Geofisika, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/tanahgoyang.2.1.13-21

Abstract

Tantangan utama dalam semua metode geofisika, termasuk pemodelan gayaberat adalah rekonstruksi distribusi parameter fisik bawah permukaan berdasarkan data yang diamati dan diambil di permukaan. Inversi gravitasi ditujukan untuk memperoleh informasi untuk membuat model distribusi densitas dibawah permukaan menggunakan percepatan gravitasi terukur yang dikenal sebagai anomali gravitasi. Pemodelan inversi adalah salah satu teknik pemodelan di mana parameter modelnya diperoleh langsung dari data pengamatan, Tujuan dari penelitian ini adalah melakukan pemograman pemodelan kedepan model Talwani serta pemodelan kebelakang dengan metode flower pollination algorithm. FPA merupakan bagian dari contoh inversi non-deterministik dan sering disebut juga sebagai algoritma penyerbukan bunga serta dikembangkan oleh Xin-She Yang pada tahun 2012. Sesuai dengan namanya, algoritma ini merupakan suatu algoritma yang terinspirasi dari proses penyerbukan bunga. Pemodelan dalam penelitian ini menggunakan tiga model sederhana yang menggambarkan suatu kondisi di bawah permukaan. Model pertama yang digunakan yaitu model dengan intrusi, model kedua yaitu model dengan patahan serta model yang terakhir yaitu model dengan adanya cekungan.
Inversi Gaya Berat Model Talwani Menggunakan Flower Pollination Algorithm Latupeirissa, Pricilia O. M; Bahri, Samsul; Alawiyah, Susanti
Tanah Goyang : Jurnal Geosains Vol 2 No 1 (2024): Tanah Goyang : Jurnal Geosains
Publisher : Program Studi Teknik Geofisika, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/tanahgoyang.2.1.13-21

Abstract

Tantangan utama dalam semua metode geofisika, termasuk pemodelan gayaberat adalah rekonstruksi distribusi parameter fisik bawah permukaan berdasarkan data yang diamati dan diambil di permukaan. Inversi gravitasi ditujukan untuk memperoleh informasi untuk membuat model distribusi densitas dibawah permukaan menggunakan percepatan gravitasi terukur yang dikenal sebagai anomali gravitasi. Pemodelan inversi adalah salah satu teknik pemodelan di mana parameter modelnya diperoleh langsung dari data pengamatan, Tujuan dari penelitian ini adalah melakukan pemograman pemodelan kedepan model Talwani serta pemodelan kebelakang dengan metode flower pollination algorithm. FPA merupakan bagian dari contoh inversi non-deterministik dan sering disebut juga sebagai algoritma penyerbukan bunga serta dikembangkan oleh Xin-She Yang pada tahun 2012. Sesuai dengan namanya, algoritma ini merupakan suatu algoritma yang terinspirasi dari proses penyerbukan bunga. Pemodelan dalam penelitian ini menggunakan tiga model sederhana yang menggambarkan suatu kondisi di bawah permukaan. Model pertama yang digunakan yaitu model dengan intrusi, model kedua yaitu model dengan patahan serta model yang terakhir yaitu model dengan adanya cekungan.
MULTIMETHOD APPROACH TO THE STUDY OF SUBSURFACE IN MERAK BATIN HOT SPRING, NATAR, LAMPUNG Santoso, Nono Agus; Junian, Wahyu Eko; Ramayanti, Fitria; Rizki, Reza; Alawiyah, Susanti
Jurnal Geosaintek Vol. 11 No. 1 (2025)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25023659.v11i1.3023

Abstract

Merak Batin Natar hot spring is a geothermal manifestation located far (16 km) from the nearest volcanic edifice and thus is of local scientific interest. The driver of this hot spring has never studied in detail, and whether this system links to the distant volcanic body is an open question. The purpose of this study was to obtain a subsurface model of the Natar hot spring. The method used is a combination of magnetic, geoelectric and geochemical methods. Based on the results of the study, it was found that the subsurface model of the Natar hot spring consists of an unaltered and altered zone. This hot spring belongs to the outflow zone, so it is natural to be in the lowlands and far from the volcano.
Study on the Significance of Reduction to the Equator (RTE), Reduction to the Pole (RTP), and Pseudogravity in Magnetic Data Interpretation Rusman, Mira Nailufar; Alawiyah, Susanti; Gunawan, Indra
Jurnal Penelitian Pendidikan IPA Vol 9 No 8 (2023): August
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v9i8.4705

Abstract

Interpretation of geomagnetic anomaly data is challenging, due to the influence of the Earth's dipole magnetic field. In this study, we investigate the significance of employing methods to transform dipole anomalies into monopoles, aiming to enhance the interpretability of the data. Four methods were examined: Reduce to Pole (RTP), Reduce to Equator (RTE), and Pseudo-Gravity. The RTP method was implemented using general equations for RTP, Pseudo-inclination (PI), and Nonlinear thresholding (NTRTP). The computation programs for RTP and RTE were developed using the Matlab programming language. Synthetic models were constructed to investigate the effects of inclination values, object dimensions, and positions on the resulting magnetic anomaly response. The result shows that NTRTP methods give the best result with coefficient correlation >0.9. It can be used in every condition (low or high inclination). The implementation was conducted utilizing magnetic data in the Gunung Pandan geothermal area. The application of the reduced to the pole (RTP) technique on the field data successfully remove the dipole effects, and make interpretation process easier. Based on RTP map, the range of anomaly values spanning from -800 nT to 1000 nT. High anomalies were observed at the Gunung Pandan site, indicative of a probable intrusion of andesitic igneous rock.
PEMODELAN TIME-LAPSE MICROGRAVITY UNTUK ESTIMASI PERUBAHAN MUKA AIRTANAH DI BANDUNG, JAWA BARAT Wahyudi, Eko Januari; A. Kadir, Wawan Gunawan; Alawiyah, Susanti; Setianingsih, Setianingsih; Gunawan, Indra; Abdurrahman, Dadi
JURNAL SUMBER DAYA AIR Vol 19, No 2 (2023)
Publisher : Direktorat Bina Teknik Sumber Daya Air, Kementerian Pekerjaan Umum dan Perumahan Rakyat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32679/jsda.v19i2.858

Abstract

 Studies related to groundwater monitoring using geophysical methods have been carried out since the 1990s. Surface gavity data with a scheme of relative gravimeter measurements is chosen for monitoring in urban areas because it is quite fast, easy, affordable, and relatively low-impact on the environment. The significance of the time-lapse microgravity method for the target of this study depends on changes in the mass of water in the aquifer layer below the surface. The research area in this study covers the city of Bandung and several surrounding areas with an interpolated grid coverage of (18 x 17) km2. Gravity changes were determined by six repeated surveys at the same observation points from 2010 to 2021. The aim of this research is to develop a method for estimating groundwater table changes based on time-lapse microgravity data modeling. The complexity of subsurface density changes is simplified for two parts related to near surface density changes and density changes in the intermediate aquifer layer. The trend of groundwater table data in 2010 is used as a reference to determine estimates for 2015, 2016 (February and August), 2019, and 2021. Modeling results for intermediate aquifers (confined groundwater system) provide changes in groundwater levels from 2010 with estimates reached ±23 meters, while the results of modeling at near surface (shallow groundwater level) indicate a groundwater level change of approximately ±8 meters from the year 2010.Keywords:       microgravity, groundwater, modeling, hydrology, aquifer.  
Co-Authors Abdurrahman, Dadi Eko Januari Wahyudi Indra Gunawan Junian, Wahyu Eko Latupeirissa, Pricilia O. M Ramayanti, Fitria Reza Rizki Rusman, Mira Nailufar Salam, Rafi Samsul Bahri Santoso, Nono Agus Setianingsih Setianingsih, Setianingsih Wawan Gunawan A. Kadir