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  • 1
    Online Resource
    Online Resource
    Multimethod Approach to the Study of Recent Volcanic Ashes from Tengger Volcanic Complex, Eastern Java, Indonesia
    MDPI AG ; 2017
    In:  Geosciences Vol. 7, No. 3 ( 2017-07-26), p. 63-
    Details
    In: Geosciences, MDPI AG, Vol. 7, No. 3 ( 2017-07-26), p. 63-
    Type of Medium: Online Resource
    ISSN: 2076-3263
    URL: Article
    DOI: 10.3390/geosciences7030063
    Language: English
    Publisher: MDPI AG
    Publication Date: 2017
    detail.hit.zdb_id: 2655946-8
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  • 2
    Online Resource
    Online Resource
    Identification Distribution of Hot Spring in Cisarua Using Magnetic Method
    IOP Publishing ; 2020
    In:  IOP Conference Series: Earth and Environmental Science Vol. 537, No. 1 ( 2020-07-01), p. 012006-
    Details
    In: IOP Conference Series: Earth and Environmental Science, IOP Publishing, Vol. 537, No. 1 ( 2020-07-01), p. 012006-
    Abstract: Lampung is one of the provinces which have hot spring resource. One of the unique hot springs in Lampung is Cisarua hot spring. Its location is far from volcanic which makes researcher curious with the system of hot spring from Cisarua. Based on the geology map, the location of hot spring is in Lampung Panjang Fault. The aim of this research is to know about type, zone and distribution of hot spring. The method used in this research is magnetic method with combined geochemistry. From geochemical analysis, the type of hot spring in Cisarua is bicarbonate water. It correlates with outflow and shallow zone. Based on 3D modelling of low magnetic anomaly, distribution of hot water is in Center and Southeast research area. Hot water is interpreted by low anomaly.
    Type of Medium: Online Resource
    ISSN: 1755-1307 , 1755-1315
    URL: Article
    DOI: 10.1088/1755-1315/537/1/012006
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2434538-6
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  • 3
    Online Resource
    Online Resource
    Penerapan Persamaan Trend Surface Analysis untuk Pemisahan Anomali Residual dan Regional pada Data Gayaberat
    Hasanuddin University, Faculty of Law ; 2021
    In:  JURNAL GEOCELEBES ( 2021-08-02), p. 102-115
    Details
    In: JURNAL GEOCELEBES, Hasanuddin University, Faculty of Law, ( 2021-08-02), p. 102-115
    Abstract: The separation of regional anomalies and residual anomalies in gravity data is an important part in interpreting gravity data. This process aims to obtain gravity anomalies that have been associated with exploration targets. The Trend Surface Analysis method is a mathematical approach to the earth field that can be used to separate maps into regional components and local components. The application of this method into gravity data can be used to separate regional anomalies and residual anomalies. The process of processing the trend surface analysis method can be done using Microsoft Excel. This method is tested first on synthetic gravity data, the purpose of this test is to determine the performance of the trend surface analysis method in performing anomaly separation. Based on the test results of the trend surface analysis method on synthetic gravity data, it was found that this method was quite good at separating regional anomalies and residual anomalies. This is evidenced by the anomalous pattern that is already the same between the regional gravity anomaly resulting from the separation of the anomaly using the trend surface analysis method and the regional anomaly resulting from synthetic data. The same anomaly pattern can also be seen in the residual anomaly resulting from the separation of the anomaly using the trend surface analysis method with the residual anomaly resulting from synthetic data. The application of the trend surface analysis method to field data has been carried out by producing regional anomalies and residual anomalies. This method is very good at separating regional anomalies and residual anomalies, especially in regional anomalies located at deep depths.Pemisahan anomali regional dan anomali residual pada data gayaberat merupakan bagian penting dalam melakukan interpretasi data gayaberat. Proses ini bertujuan untuk mendapatkan anomali gayaberat yang sudah berasosiasi dengan target eksplorasi. Metode Trend Surface Analysis merupakan teknik pendekatan matematika pada bidang kebumian yang dapat digunakan untuk memisahkan peta kedalam komponen regional dan komponen lokal. Penerapan metode ini ke dalam data gayaberat dapat digunakan untuk memisahkan anomali regional dan anomali residual. Proses pengolahan metode trend surface analysis dapat dilakukan dengan menggunakan microsoft excel. Metode ini diuji terlebih dahulu pada data gayaberat sintetis, tujuan pengujian ini adalah untuk mengetahui performa metode trend surface analysis dalam melakukan pemisahan anomali. Berdasarkan hasil pengujian metode trend surface analysis pada data gayaberat sintetis didapatkan bahwa metode ini cukup baik dalam memisahkan anomali regional dan anomali residual. Hal ini dibuktikan pada pola anomali yang sudah sama antara anomali gayaberat regional hasil pemisahan anomali metode trend surface analysis dengan anomali regional hasil data sintetis. Pola anomali yang sama juga dapat dilihat pada anomali residual hasil pemisahan anomali metode trend surface analysis dengan anomali residual hasil data sintetis. Penerapan metode trend surface analysis pada data lapangan telah dilakukan dengan menghasilkan anomali regional dan anomali residual. Metode ini sangat baik dalam memisahkan anomali regional dan anomali residual terutama pada anomali regional yang berada pada kedalaman dalam
    Type of Medium: Online Resource
    ISSN: 2579-5546 , 2579-5821
    URL: Article
    DOI: 10.20956/geocelebes.v5i2.14023
    Language: Unknown
    Publisher: Hasanuddin University, Faculty of Law
    Publication Date: 2021
    detail.hit.zdb_id: 2967205-3
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  • 4
    Online Resource
    Online Resource
    INVERSI DATA GEOLISTRIK MENGGUNAKAN PARTICLE SWARM OPTIMIZATION: STUDI KASUS DESA GAYAU
    Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Lampung ; 2021
    In:  JGE (Jurnal Geofisika Eksplorasi) Vol. 7, No. 2 ( 2021-07-25), p. 88-99
    Details
    In: JGE (Jurnal Geofisika Eksplorasi), Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Lampung, Vol. 7, No. 2 ( 2021-07-25), p. 88-99
    Abstract: Desa Gayau yang terletak di Kecamatan Padang Cermin, Kabupaten Pesawaran sering mengalami kekeringan air pada saat musim kemarau sehingga perlu dilakukannya pengukuran geolistrik untuk mengidentifikasi keberadaan lapisan akuifer air tanah. Pada penelitian ini konfigurasi yang digunakan adalah Schlumberger dengan panjang bentangan MN/2 sebesar 1, 5, 10, dan 20 meter. Sedangkan panjang bentangan AB/2 sebesar 6 hingga 300 meter. Pada tahapan inversi data VES, kami menggunakan algoritma Particle Swarm Optimization (PSO) untuk memperoleh nilai parameter resistivitas dan ketebalan lapisan. Algoritma ini dipilih karena cepat menuju konvergen dan relatif stabil. Hasil dari inversi ini diperoleh bahwa lapisan akuifer pertama berada pada kedalaman 21.4 - 52.1 meter dengan litologi batupasir berbutir halus dengan sisipan tufa Lapisan akuifer kedua berada pada kedalaman 52.1-70 meter dengan litologi breksi. Pada kedalaman 70 meter diinterpretasikan sebagai akuifer air tanah, namun memiliki debit yang kecil. Hal ini disebabkan karena litologi lapisan berupa breksi, dasit dan lava basal dari Formasi Hulusimpang. Sistem aliran air tanah pada lapisan ini merupakan sistem media pori yang berakibat pada debit rendah dan waktu pengisian kembali lapisan air tanah relatif lama.
    Type of Medium: Online Resource
    ISSN: 2685-6182 , 2356-1599
    URL: Article
    DOI: 10.23960/jge.v7i2.118
    Language: Unknown
    Publisher: Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Lampung
    Publication Date: 2021
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  • 5
    Online Resource
    Online Resource
    SUBSURFACE SURVEY OF CISARUA LAMPUNG HOT SPRINGS USING GEOCHEMICAL AND GRADIO-MAGNETIC METHOD
    Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Lampung ; 2022
    In:  JGE (Jurnal Geofisika Eksplorasi) Vol. 8, No. 1 ( 2022-03-30), p. 58-66
    Details
    In: JGE (Jurnal Geofisika Eksplorasi), Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Lampung, Vol. 8, No. 1 ( 2022-03-30), p. 58-66
    Abstract: The subsurface survey was carried out in Cisarua Hot Springs, South Lampung. Cisarua Hot Springs has a neutral pH and a temperature of about 44 °C. A combination of geochemical and gradio-magnetic methods was used in this research. This research identifies the characteristics of the Cisarua Hot Springs, estimates reservoir temperature, and creates a subsurface model to determine the hot fluid distribution in the study area. According to the geological data, the manifestation of these hot springs correlates with the Lampung-Panjang Fault. The geochemical results show that this type of hot springs fluid is bicarbonate water, and the reservoir temperature is estimated to be around 160 °C. The low gradio-magnetic anomaly is correlated with the distribution of subsurface hot water flow, according to the 3D model of the gradio-magnetic method. The distribution of subsurface hot fluids is in the middle to the eastern part of the research area.
    Type of Medium: Online Resource
    ISSN: 2685-6182 , 2356-1599
    URL: Article
    DOI: 10.23960/jge.v8i1.176
    Language: Unknown
    Publisher: Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Lampung
    Publication Date: 2022
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  • 6
    Online Resource
    Online Resource
    STRATIGRAFI SUSEPTIBILITAS MAGNETIK SINGKAPAN EMBUNG E SEBAGAI ACUAN INTERPRETASI BAWAH PERMUKAAN DI INSTITUT TEKNOLOGI SUMATERA
    Lembaga Penelitian dan Pengabdian kepada Masyarakat ITS ; 2022
    In:  Jurnal Geosaintek Vol. 8, No. 1 ( 2022-04-23), p. 135-
    Details
    In: Jurnal Geosaintek, Lembaga Penelitian dan Pengabdian kepada Masyarakat ITS, Vol. 8, No. 1 ( 2022-04-23), p. 135-
    Type of Medium: Online Resource
    ISSN: 2502-3659 , 2460-9072
    URL: Article
    DOI: 10.12962/j25023659.v8i1.11442
    Language: Unknown
    Publisher: Lembaga Penelitian dan Pengabdian kepada Masyarakat ITS
    Publication Date: 2022
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  • 7
    Online Resource
    Online Resource
    Geochemical Compositions and Magnetic Susceptibility of Soils from Different Origins: A Case Study in South Lampung, Indonesia
    Indonesian Journal on Geoscience ; 2020
    In:  Indonesian Journal on Geoscience Vol. 7, No. 3 ( 2020-10-07)
    Details
    In: Indonesian Journal on Geoscience, Indonesian Journal on Geoscience, Vol. 7, No. 3 ( 2020-10-07)
    Type of Medium: Online Resource
    ISSN: 2355-9306 , 2355-9314
    URL: Article
    DOI: 10.17014/ijog.7.3.267-272
    Language: Unknown
    Publisher: Indonesian Journal on Geoscience
    Publication Date: 2020
    detail.hit.zdb_id: 2835641-X
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  • 8
    Online Resource
    Online Resource
    Geochemical study to determine what elements are most influential in soil fertility in the southern part of Lampung region
    IOP Publishing ; 2024
    In:  IOP Conference Series: Earth and Environmental Science Vol. 1307, No. 1 ( 2024-02-01), p. 012022-
    Details
    In: IOP Conference Series: Earth and Environmental Science, IOP Publishing, Vol. 1307, No. 1 ( 2024-02-01), p. 012022-
    Abstract: Lampung is one of the best provinces in Indonesia in the agricultural sector. Research on agriculture in Lampung continues to develop over time. To expand land, research on agricultural land is needed. Agricultural soil contains chemical elements that support soil fertility. The aim of this research is to find out which chemical elements have the best correlation with soil fertility. The samples used were agricultural soil samples from the South Lampung and Pesawaran areas. The method used is a geochemical method with pH measurements and X-Ray Fluorescence testing. The results obtained were that the Mg element had a very strong correlation with soil fertility so that in the future the Mg element could be used as an indicator of soil fertility levels.
    Type of Medium: Online Resource
    ISSN: 1755-1307 , 1755-1315
    URL: Article
    DOI: 10.1088/1755-1315/1307/1/012022
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2024
    detail.hit.zdb_id: 2434538-6
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  • 9
    Online Resource
    Online Resource
    Basaltic Lava Characteristic in Goa Pandan Area, Sukadana, East Lampung: Inferences from Stratigraphy and Petrography Analysis
    UIR Press ; 2023
    In:  Journal of Geoscience, Engineering, Environment, and Technology Vol. 8, No. 2 ( 2023-06-23), p. 112-122
    Details
    In: Journal of Geoscience, Engineering, Environment, and Technology, UIR Press, Vol. 8, No. 2 ( 2023-06-23), p. 112-122
    Abstract: The presence of extensive basalt formations in East Lampung has its own attractions in the field of geology, particularly the presence of Goa Pandan as a lava cave and tourist attraction in East Lampung. The presence of basalt lava in the southern part of the South Sumatra Basin has drawn attention to the presence of this lava, but detailed research on the characteristics of the lava and its formation process is still very rare. This study aims to determine the eruption period of the basalt lava and magma evolution process based on the correlation between lava stratigraphy and petrography analysis. Field observations show a lava sequence that forms Goa Pandan. Each lava sequence is characterized by autobreccia and vesicular structures on the surface. In addition, the presence of columnar joints, sheeting joints, massive lava, and other additional structures indicate the characteristics of low-viscosity basalt lava. The presence of mineral structures and abundance under the microscope clearly shows the magma formation process when basalt lava flowed on the surface. Resorption-overgrowth of plagioclase and pyroxene minerals indicates an open system when basalt lava flowed on the surface. In addition, the presence of zoning and patching in plagioclase minerals indicates that magma variability is influenced by temperature. The documentation of this lava stratigraphy can serve as a basis for further understanding of magma characteristics and formation processes. There is still much geological work that can be done in the research area to get a detailed picture of the evolution process of magma and the presence of basalt lava in this area.
    Type of Medium: Online Resource
    ISSN: 2541-5794 , 2503-216X
    URL: Article
    DOI: 10.25299/jgeet.2023.8.2.12118
    Language: Unknown
    Publisher: UIR Press
    Publication Date: 2023
    detail.hit.zdb_id: 3069706-2
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  • 10
    Online Resource
    Online Resource
    Beneath the Surface: Identifying Subsurface Caves in "Gua Pandan" Using Integrated Electrical Profiling Method
    Tanjungpura University ; 2023
    In:  POSITRON Vol. 13, No. 1 ( 2023-05-31), p. 31-
    Details
    In: POSITRON, Tanjungpura University, Vol. 13, No. 1 ( 2023-05-31), p. 31-
    Abstract: One of the geopark tourism areas in East Lampung Regency, "Gua Pandan," has run into rock subsidence on the surface. As part of the subsidence prevention, indirect electrical methods between resistivity and chargeability profiling were applied to identify the presence of a subsurface cave in the study area. Two measurement lines were carried out with Wenner Alpha and Wenner Schlumberger arrays. Because the depth target is shallow (approximately 10 m) and to obtain a better resolution, each line has a stretch length of 70 m and 2 m electrode spacing. A line was measured over a known underground cave to produce a desired outcome, and the other was in an area with no cavities. Based on the results from each profile of resistivity and chargeability, an air-filled target has a value of over 5,000  and under 6 ms, respectively. Then, integrated processing of both methods generated a metal factor (MF) profile to view the presence and estimated shape of the cave/ cavities. The result represents that an MF value under 1.5 ms/Ωm is a cavity, and solid rock is over 1.5 ms/Ωm. Also, the MF level from both configurations delineates a similar section. However, a modest difference occurs in estimating the cavity shape geometry,  for Wenner Apha and  for Wenner Schlumberger. Furthermore, this study can be an initial step in safety assessment in the area.
    Type of Medium: Online Resource
    ISSN: 2549-936X , 2301-4970
    URL: Article
    DOI: 10.26418/positron.v13i1.63558
    Language: Unknown
    Publisher: Tanjungpura University
    Publication Date: 2023
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