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Yekti Widyaningrum

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Author-ID : 5340476

Astronomy Computer Science & IT Earth & Planetary Sciences Materials Science & Nanotechnology Physics

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Penggunaan Automated Phase Picking pada Estimasi Hiposenter Gempa Lokal: Studi Kasus Lengan Atas Sulawesi A.M. Miftahul Huda; Ain Sahara; Yekti Widyaningrum
Jurnal Riset Fisika Indonesia Vol 1 No 2 (2021): Juni 2021
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Estimasi Hiposenter dilakukan pada beberapa kejadian gempa lokal di Lengan atas Pulau Sulawesi. Prosesnya dilakukan dengan memanfaatkan data waktu tiba gelombang P dan S yang didapatkan melalui automated phase picking. Diagram Wadati digunakan untuk menguji kelayakan data dan HYPOINVERSE digunakan untuk estimasi hiposenter. Rasio Vp/Vs menampilkan hasil yang bervariasi dan RMS menunjukkan data picking kurang baik. Hasil ini memberikan dampak pada nilai-nilai RMS yang cukup tinggi pada estimasi hiposenter. Terjadi perbandingan terbalik pada hasil jika dilihat melalui nilai RMS antara Wadati dan HYPOINVERSE. Perlu dilakukan perbaikan data picking supaya mendapatkan estimasi yang lebih baik.

Identification of Mineralization Zones Using Geoelectrical Methods Self-Potential (Sp) in Pemali Village Bangka Regency Renata Angrainy; Muhammad Budi Hariyono; Susi Mariana; Yekti Widyaningrum
Jurnal Riset Fisika Indonesia Vol 2 No 1 (2021): Desember 2021
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Bangka Belitung as an area that has a lot of potential natural mineral resources, especially tin minerals, this tin mineral potential can be utilized for industrial and non-industrial purposes. Utilization of these minerals can be done by way of exploration, exploration of mineral distribution can be done directly in the field using geophysical methods. In this study the method used is the geoelectric method of self-potential (Sp) fixed base configuration. Data acquisition was carried out in two research sample areas, namely, region 1 and region 2 with a distance between the porouspot electrodes as far as 5 m. Data retrieval on the rover was carried out at each point of the trajectory, three times the data was taken with an interval of 30 seconds, while the retrieval at the base in region 1 was carried out every 3 minutes while in region 2 it was carried out every 1 minute. The research is focused on identifying the distribution of mineral zones below the surface. The results of the study are in the form of a contour map that describes the distribution pattern of potential difference anomalies (Sp) and a topographical anomaly map at the research location, which will later be interpreted to determine the direction of the distribution of minerals below the surface of the study site.

Identifikasi Sebaran Air Lindi (Leachate) Menggunakan Metode Geolistrik Self-Potential (SP) Di Tempat Pembuangan Akhir (TPA) Parit Enam Kota Pangkalpinang Hoirotul Padilah; Yekti Widyaningrum; Widodo Budi Kurniawan
Jurnal Riset Fisika Indonesia Vol 2 No 1 (2021): Desember 2021
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Garbage is a common pollutant that causes various negative impacts such as lack of aesthetic value to the environment, brings various types of diseases and clogs waterways. The waste is then transported and disposed of at the TPA. The Parit Six TPA in Pangkalpinang City accommodates around 150 tons of garbage every day. This will cause contamination of water, soil and ground water by leachate seeping from the pile of garbage exposed to rain. The leachate can be identified using the Geoelectric Self Potential (SP) method using a fixed base technique with a space between the electrodes of 5 m. Then obtained the results of data acquisition from 6 paths as many as 92 points. Furthermore, the resulting data will be corrected and processed to produce isopotential contours and topography. Based on isopotential contours and topography, the distribution of fluid in the area around the Parit Enam TPA Pangkalpinang City is spread in the northeast, southwest to the north of the study area. The fluid quality around the study site is known from the results of density and pH of the sample well water. These results show the distribution of leachate in the area around the Parit Enam TPA Pangkalpinang City is spread from the northeast to the southwest in the northern part of the research area and from the southwest to the southern part of the research area towards the northern part of the research area.

Pemodelan Anomali Self Potential (SP) Menggunakan Algoritma MVDE (Multi Variant Differential Evolution) Muhammad Budi Haryono; Yekti Widyaningrum; Herman Aldila
Jurnal Riset Fisika Indonesia Vol 3 No 2 (2023): Juni 2023
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jrfi.v3i2.4162

Self Potential (SP) is a practical and simple geophysical method. Interpretation of the data of these methods can be done qualitatively and quantitatively. Quantitative interpretation can be done through inversion modeling, but inversion modeling often has problems with the solution of model parameters that are stuck at local minima. Therefore, in this study the MVDE (Multi Variant Differential Evolution) algorithm is used which is able to solve model parameter problems, by finding global model parameter solutions. Inversion modeling of observation Self Potential (SP) anomaly data is carried out using an algorithm that has been tested and produces a misfit of ≤10%, the test aims so that the algorithm can be used further to model observation data. The observation Self Potential (SP) anomaly modeling produces model parameter values K=609.3mV D=9.3 h=3.75m q=1.51 and x=1-16, with a subsurface anomaly model in the form of a spherical geometry at depth 3.75m.

Identifikasi Pola Aliran Air Tanah di Lapangan Panas Bumi Non-Vulkanik Desa Nyelanding Kabupaten Bangka Selatan Berdasarkan Anomali Self-Potential Yekti Widyaningrum; Anisa Indriawati; Githa Nurvilia Afni; Eri Gusnia; Tri Kusmita
Jurnal Riset Fisika Indonesia Vol 3 No 2 (2023): Juni 2023
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jrfi.v3i2.4311

As one of unique non-volcanic geothermal field in Indonesia, mapping the groundwater flow in Nyelanding Village, South Bangka is essential as preliminary study for further exploration activity if the geothermal manifestation. In order to achieve this goal, we conduct a research using natural electrical properties of subsurface, Self-Potentials (SP) method. In this study, fixed-based technique was used where the spacing between measurement stations is the multiplication of 10 m along three lines at the study area. Raw field data (potential value) was corrected to diurnal and closure corrections. Further, SP anomaly was plotted and combined with topography data to be analyzed. The result shows potential value raging from -25mV to 100mV which in agreement with the lowest and highest elevation in topography map, respectively. This means, these values are controlled by topographic feature in the study area. Thus, in conclusion, the groundwater flows from the West to North East and South East part of the study area

Pengaruh Penambahan Karbon Aktif Dari Kulit Lada dan Suhu Aktivasi Karbon terhadap Nilai Konduktivitas Anoda Berbasis LTO Jefri Akbar; Widodo Budi Kurniawan; Yekti Widyaningrum; Anisa Indriawati
Jurnal Riset Fisika Indonesia Vol 4 No 1 (2023): Desember 2023
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jrfi.v4i1.3823

Identifikasi Lapisan Akuifer Menggunakan Metode Geolistrik Resisitivitas Konfigurasi Dipole – Dipole Di Kelurahan Padang Mulya Kecamatan Koba Reza Firdaus Fir Daus; Yekti Widyaningrum; Anisa Indriawati
Jurnal Riset Fisika Indonesia Vol 4 No 1 (2023): Desember 2023
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jrfi.v4i1.4314

Padang Mulya Village, Koba District is part of the Koba Groundwater Basin area. This area has the potential of abundant aquifer layers. An aquifer is a layer of rock that can store water in large quantities. However, the continued increase in exploration of the aquifer layer will result in damage to the aquifer environment. In this case it is necessary to identify the aquifer layers to determine the depth and lithology of the constituent rocks. The resistivity geoelectric method of the dipole-dipole configuration is the most sensitive geophysical method for identifying aquifer layers. Measurements were made on six tracks to obtain data variations on current strength and potential difference. From these data variations in apparent resistivity values will be obtained. 2D modeling of the apparent resistivity value using the backward modeling method is carried out on each track in order to obtain a 2D cross-section of the subsurface structure. The 2D section of each track has an aquifer layer with a depth of 0 meters to 20 meters and is composed of clay, loamy sand, rather dense gravel sand and sandstone.

Co-Authors A.M. Miftahul Huda Ain Sahara Anisa Indriawati Eri Gusnia Githa Nurvilia Afni Haryono, Muhammad Budi Herman Aldila Hoirotul Padilah Jefri Akbar Muhammad Budi Hariyono Renata Angrainy Reza Firdaus Fir Daus Susi Mariana Tri Kusmita Widodo Budi Kurniawan

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