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APLIKASI GEOLISTRIK KONFIGURASI WENNER DALAM MENDETEKSI PENCEMARAN AIR TANAH AKIBAT GAMBUT PADA DESA SUNGAI TERAP ira kusuma dewi; Nasri MZ; Ichy Lucya Resta; Juventa
JOURNAL ONLINE OF PHYSICS Vol. 6 No. 1 (2020): JOP (Journal Online of Physics) Vol 6 No 1
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v6i1.10633

Sungai Terap Village, Betara District, Tanjung Jabung Timur Regency is one of the areas in Jambi Province which is composed of peat soil. Peat land in this village is used by the community as agricultural and plantation land. As a result, the peat soil is degraded and damaged, causing groundwater pollution. The application of the resistivity geoelectric method can answer the question of groundwater pollution. In the current method that is injected into the earth and measures the potential difference on the surface. Geoelectric measurements were carried out in 4 lines with a length of 200 meters, electrode separation of 10 meters and n = 4. From the measurement results, it was found that groundwater was polluted due to peat soil because it had a very small resistivity value, namely 0.625-2.064 Ωm. This is because the chemical content contained in the peat soil will be carried away by rainwater that enters the surface. The effect of sea water intrusion can also pollute groundwater through drainage channels built on the peatlands.

ANALISIS KETEBALAN LAPISAN SEDIMEN DAN INDEKS KERENTANAN SEISMIK KOTA JAMBI BAGIAN TIMUR Arie Satria; Ichy Lucya Resta; Nasri MZ
Jurnal Geofisika Eksplorasi Vol 6, No 1 (2020)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v6i1.58

A Research was carried about analysis of sediment layer thickness and seismic vulnerability index in eastern Jambi City. The purpose of this research was to determine the effect of sediment layer thickness on seismic vulnerability index in eastern Jambi City based on microtremor data. The Acquisition data of microtremor is 25 points spread in research area. Processing data was carried out using the HVSR (Horizontal to Vertical Spectra Ratio) method to obtain the H/V curve. This curve represents the value of the natural frequency (f0) and amplification factor (A0). Based on the results of data processing obtained, the range of natural frequency (f0) value is 1.04 – 3.78 Hz, the range of amplification factor (A0) value is 1.13 - 4.88 times, the range of sediment layer thickness (h) value is 16.46 – 61.45 meters, and the range of seismic vulnerability index (Kg) value is 0.70 - 20.18×10-6 cm2/s. The results showed that the distribution of seismic vulnerability index (Kg) correlated relatively well with sediment layer thickness of the research area. The high zone of seismic vulnerability index (Kg) is relatively associated with alluvial deposits and also the sediment layer thickness of more than 30 meters. The high zone of seismic vulnerability index (Kg) is concentrated in Pasir Panjang, Tanjung Raden to Olak Kemang in Danau Teluk sub-district and Tanjung Sari in Jambi Timur sub-district.

Identification of Peat Land Pollution in Sungai Terap Village Using Wenner Configuration Geoelectric Method Ira Kusuma Dewi; Nasri MZ; Ichy Lucya Resta; Juventa Juventa
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Publisher : Pusat Unggulan Riset Pengembangan Lahan Suboptimal (PUR-PLSO) Universitas Sriwijaya

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Dewi IK, MZ Nasri, Resta IL, Juventa J.2020. Identification of Peat Land Pollution in Sungai Terap Village Using Wenner Configuration Geoelectric Method. In: Herlinda S et al. (Eds.), Prosiding Seminar Nasional Lahan Suboptimal ke-8 Tahun 2020, Palembang 20 Oktober 2020. pp. xxx. Palembang: Penerbit & Percetakan Universitas Sriwijaya (UNSRI). Groundwater pollution arising from the conversion of functions on peatlands in Sungai Terap Village. To identify the ground air pollution, the geoelectric method of research using Wenner was carried out. This research was conducted in 4 tracks with a length of 200 meters and the distance between the electrodes was 10 meters with 4 times the electrode spacing. The results of this study are 2D subsurface models in the form of apparent resistivity from the inversion results. The resistivity value generated in the 2D model ranges from 0.381-19 Ωm. The water content at the research location with a very small resistance value between 0.4-1.25 Ωm. The presence of groundwater is estimated to be trapped in the alluvium layer at a depth of 7.75-19.4 meters. The groundwater is thought to have been polluted because it has a resistivity value <10 Ωm. Almost every measurement path is found in polluted air due to rainfall and sea water intrusion.

IDENTIFIKASI LAPISAN BAWAH PERMUKAAN DAERAH PROSPEK PANAS BUMI SONGA-WAYAUA BERDASARKAN METODE MAGNETOTELURIK Rikaldo Pratama; Ichy Lucya Resta; Faizar Farid; Wiwid Joni
Jurnal Meteorologi dan Geofisika Vol 22, No 2 (2021)
Publisher : Pusat Penelitian dan Pengembangan BMKG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31172/jmg.v22i2.786

Manifestasi panas bumi yang terdapat di daerah Songa, Halmahera Selatan, Maluku Utara, berupa sumber mata air panas, fumarol dengan hembusan asap, kolam-kolam lumpur tanah panas dan alterasi. Reservoir daerah prospek panas bumi Songa-Wayaua diduga berada pada kedalaman >400 m. Distribusi nilai resistivitas rendah <30 Ωm mengindikasikan terdapatnya clay cap sebagai lapisan impermeabel. Distribusi resistivitas sedang 50-100 Ωm diindikasikan terdapatnya reservoir sebagai tempat terakumulasinya fluida, sedangkan resistivitas tinggi >1000 Ωm dicirikan terdapatnya heat source sebagai sumber panas. Daerah panas bumi Songa-Wayaua telah dilakukan pengukuran metode survei pendahuluan yaitu metode geolistrik, metode gaya berat, dan metode magnetik, sedangkan metode magnetotelurik masih belum ada. Metode Magnetotelurik (MT) merupakan metoda eksplorasi geofisika yang memanfaatkan medan elektromagnetik alami bumi. Pengolahan data yang didapatkan dari perekaman data MT berupa Time series. Untuk dapat diubah menjadi kurva resistivitas MT, data tersebut harus melalui beberapa tahap pemrosesan yang meliputi fourier transform, dan seleksi cross power serta masking dan smoothing data sehingga didapatkan model bawah permukaan. Dari 7 titik pengukuran diperoleh sebaran nilai resistivitas berkisar antara 1 – 4500 Ωm dimana batuan penudung dengan nilai resistivitas <30 Ωm dan ketebalan 500 m. Reservoir dengan nilai resisitivitas 50-600 Ωm dan ketebalan 1000 m, sedangkan heat source berada pada kedalaman 1500 m dengan nilai resistivitas 1000-4500 Ωm. Terdapat dua sesar sebagai pengontrol munculnya mata air panas, yaitu Sesar Pele-pele dan Sesar Lapan.

Identifikasi Bahaya Tanah Longsor Menggunakan Metode Very Low Frequency (VLF) Di Bedeng Rejo, Merangin, Jambi Ichy Lucya Resta; Futra Kibayutullah; Amelia Fitri Ramadhani; Muhammad Yuwanda; Muhammad Rifqi
Jurnal Geosaintek Vol 8, No 2 (2022)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25023659.v8i2.13930

Desa Bedeng Rejo dikenal sebagai salah satu daerah yang berpotensi dalam terjadinya tanah longsor. Metode Very Low Frequency (VLF) digunakan untuk identifikasi bahaya tanah longsor berdasarkan parameter konduktivitas batuan yang didukung kemiringan lereng (slope). Penelitian ini dilakukan menggunakan T-VLF dengan panjang lintasan 200 meter, jarak antar titik ukur 10 meter dan frekuensi pengukuran sebesar 22200 Hz (Jepang). Jenis pengukuran VLF yang digunakan yaitu mode tilt-angle. Ditemukan anomali konduktif yang berada pada rentang 100 - 120 meter dan di bawah permukaan bumi pada 10 - 40 meter dan 170 - 190 meter dengan kedalaman 10 - 30 meter. Perhitungan kemiringan lereng pada lintasan VLF, didapatkan pada jarak 100 – 120 meter yaitu 25% dan pada jarak 170 – 190 meter yaitu 12,5 - 16,67% merupakan lahan dengan kemiringan lereng curam, yang rentan terhadap bahaya tanah longsor, dan mudah tererosi.

IDENTIFIKASI LAPISAN BATUBARA MENGGUNAKAN METODE GEOLISTRIK KONFIGURASI SCHLUMBERGER DI LAPANGAN X KECAMATAN BULIAN KABUPATEN BATANGHARI Ichy Lucya Resta; Riski Novrianti
JOURNAL ONLINE OF PHYSICS Vol. 8 No. 2 (2023): JOP (Journal Online of Physics) Vol 8 No 2
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v8i2.23979

Studi ini menggunakan salahsatu metode geofisika, geolistrik, yang memberikan informasi bawah permukaan secara spasial berdasarkan sebaran nilai resistivitas. Pengukuran vertical electrical sounding (konfigurasi schlumberger) dilakukan pada 5 titik di Desa Sungai Buluh Kecamatan Bulian Kabupaten Batanghari untuk mendapatkan nilai resistivitas. Model bawah permukaan didapatkan melalui inversi data resistivitas 1-D yang kemudian dikorelasikan dengan data coring yang tersedia di dekat titik pengukuran terkait litologi. Berdasarkan model yang didapat, sebaran nilai resistivitas berada pada rentang nilai 42,5 ohm.m – 1421 ohm.m dengan kedalaman target rata-rata 30,94 m. Resistivitas tinggi (154 ohm.m – 297 ohm.m) diidentifikasi sebagai batubara sub bituminous. Berdasarkan identifikasi lapisan, ditemukan 2 seam batubara dimana seam 1 teridentifikasi pada seluruh titik pengukuran dengan rata-rata ketebalan 1,74 m dan dan kedalaman 13,50 m sedangkan seam 2 hanya terdapat 4 titik pengukuran dengan rata-rata ketebalan 3,325 m dan kedalaman 25,10 m. Disimpulkan bahwa metode geolistrik cocok digunakan dalam identifikasi lapisan batubara dengan resolusi dan akurasi yang baik.

ANALISIS KERENTANAN TANAH FAKULTAS SAINS DAN TEKNOLOGI UNIVERSITAS JAMBI DENGAN MENGGUNAKAN DATA MIKROTREMOR Ira Kusuma Dewi; Ichy Lucya Resta; Sarwo Sucitra Amin; Nuklirullah Nuklirullah; Juventa Juventa; Salomo Situmorang; Amelia Fitri Ramadhani
JOURNAL ONLINE OF PHYSICS Vol. 9 No. 1 (2023): JOP (Journal Online of Physics) Vol 9 No 1
Publisher : Prodi Fisika FST UNJA

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Research has been carried out to carry out soil vulnerability analysis at the Faculty of Science and Technology, Jambi University. The construction of buildings at the Faculty of Science and Technology has necessitated an analysis of the vulnerability of the land around the buildings at the Faculty of Science and Technology. Based on the regional geology in this area, the Muara Enim formation (TMPM) is formed in the Tertiary age which is composed of rocks from interbedded tuffaced sandstones with tuffaced mudstones, interbedded quartz sandstones with quartz mudstones, interbedded with coal and iron oxide. The rocks formed in this formation are a type of sedimentary rock. To carry out soil vulnerability analysis, the HVSR method is applied to measure microtremors. Microtremors are a geophysical method that uses very small and continuous ground vibrations. This HVSR method is a passive seismic method using three components, namely 2 horizontal components and 1 vertical component. Microtremor measurements on the ground were carried out at 6 points around the building. The results obtained from microtremor measurements using the HVSR method are the natural frequency (f0), amplification factor (A0) and Seismic Vulnerability Index (Kg). The natural frequency (f0) value ranges from 1.30-1.82 Hz, the amplification factor (A0) value ranges from 1.69 - 3.28 times and the seismic vulnerability index (kg) value ranges from 1.814167 to 5.948834 x 10^-6 s^2/cm. Based on the Kanai classification, a frequency value < 2.5 HZ includes soil type IV and soil type II with Alluvial Rock lithology formed from delta sedimentation, top soil, mud. With a depth of 30 meters or more. This area has a very thick surface sediment, more than 30 meters. Based on the classification according to Setiawan, the amlification factor is classified as low (A0<3) to medium (3<A0<6). A low to moderate amplification factor indicates that the rock that makes it up is compact/hard. Based on the Refrizon Classification, the Seismic Vulnerability Index value is in the low (kg<3) to medium (3<kg<6) category. The seismic vulnerability index is low to medium, meaning that if a shock occurs there will be no damage because the vulnerability value is medium - low. Based on these three parameters, it can be concluded that the land around the FST building is still classified as safe from shocks.

Identifikasi Keberadaan Manifestasi Daerah Panasbumi Gunung Sumbing, Jangkat Berdasarkan Interpretasi Data Landsat 8 dan Geolistrik Rizky Mahardhika; Yulia Morsa Said; Ichy Lucya Resta; Agus Kurniawan Mastur
Jurnal Geologi dan Sumberdaya Mineral Vol. 21 No. 4 (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.v21i4.486

Daerah panasbumi Gunung Sumbing terletak di Desa Renah Kemumu, Kecamatan Jangkat, Kabupaten Merangin, Provinsi Jambi pada ketinggian Â± 900 mdpl. Keberadaan manifestasi panasbumi di lokasi penelitian diduga belum terpetakan seluruhnya. Untuk mengidentifikasi sebaran manifestasi panasbumi dapat menggunakan Citra Landsat 8 berdasarkan sensor TIRS pada band 10. Akuisisi data geolistrik menggunakan konfigurasi dipole-dipole dilakukan sepanjang manifestasi air panas dan tanah beruap dengan panjang lintasan 750 m dan spasi elektroda 25 m. Penelitian ini bertujuan mendapatkan sebaran manifestasi panasbumi berdasarkan suhu permukaan tanah dari Citra Landsat 8 dan mendeskripsikan lapisan batuan bawah permukaan dalam menganalisis karakteristik hot springs flow berdasarkan metode geolistrik. Suhu permukaan tinggi berkisar 21-30Â°C berada di bagian baratdaya daerah penelitian. Hasil pengukuran geolistrik menunjukkan fluida hidrotermal dengan resistivitas 5 â€“ 40 Î©m. Hal itu dikarenakan fluida hidrotermal berasosiasi dengan batuan alterasi sehingga bersifat konduktif. Aliran fluida hidrotermal teridentifikasi pada kedalaman 0 m hingga 25 m. Berdasarkan integrasi data geologi, faktor pengontrol adanya manifestasi mata air panas disebabkan oleh segmen Sesar Dikit dan batuan Vulkanik di daerah penelitian.Katakunci: Citra Landsat 8, metode geolistrik, panasbumi, hot springs flow.

IDENTIFIKASI LAPISAN BAWAH PERMUKAAN DAERAH PROSPEK PANAS BUMI SONGA-WAYAUA BERDASARKAN METODE MAGNETOTELURIK Rikaldo Pratama; Ichy Lucya Resta; Faizar Farid; Wiwid Joni
Jurnal Meteorologi dan Geofisika Vol. 22 No. 2 (2021)
Publisher : Pusat Penelitian dan Pengembangan BMKG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31172/jmg.v22i2.786

Manifestasi panas bumi yang terdapat di daerah Songa, Halmahera Selatan, Maluku Utara, berupa sumber mata air panas, fumarol dengan hembusan asap, kolam-kolam lumpur tanah panas dan alterasi. Reservoir daerah prospek panas bumi Songa-Wayaua diduga berada pada kedalaman >400 m. Distribusi nilai resistivitas rendah <30 Ωm mengindikasikan terdapatnya clay cap sebagai lapisan impermeabel. Distribusi resistivitas sedang 50-100 Ωm diindikasikan terdapatnya reservoir sebagai tempat terakumulasinya fluida, sedangkan resistivitas tinggi >1000 Ωm dicirikan terdapatnya heat source sebagai sumber panas. Daerah panas bumi Songa-Wayaua telah dilakukan pengukuran metode survei pendahuluan yaitu metode geolistrik, metode gaya berat, dan metode magnetik, sedangkan metode magnetotelurik masih belum ada. Metode Magnetotelurik (MT) merupakan metoda eksplorasi geofisika yang memanfaatkan medan elektromagnetik alami bumi. Pengolahan data yang didapatkan dari perekaman data MT berupa Time series. Untuk dapat diubah menjadi kurva resistivitas MT, data tersebut harus melalui beberapa tahap pemrosesan yang meliputi fourier transform, dan seleksi cross power serta masking dan smoothing data sehingga didapatkan model bawah permukaan. Dari 7 titik pengukuran diperoleh sebaran nilai resistivitas berkisar antara 1 – 4500 Ωm dimana batuan penudung dengan nilai resistivitas <30 Ωm dan ketebalan 500 m. Reservoir dengan nilai resisitivitas 50-600 Ωm dan ketebalan 1000 m, sedangkan heat source berada pada kedalaman 1500 m dengan nilai resistivitas 1000-4500 Ωm. Terdapat dua sesar sebagai pengontrol munculnya mata air panas, yaitu Sesar Pele-pele dan Sesar Lapan.

IDENTIFICATION OF SITE CLASS USING MICROTREMOR HVSR MEASUREMENTS IN TANAH KAMPUNG DISTRICT Rio Gemilang; Nurlaili Syawalia; Ichy Lucya Resta; Bagus Adhitya; Agustian Efendi; Jeremia Sitompul; Ahmad Rizky Marpaung; Rendy Agus Setiawan
JOURNAL ONLINE OF PHYSICS Vol. 9 No. 3 (2024): JOP (Journal Online of Physics) Vol 9 No 3
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v9i3.36098

This research was conducted to determine the site class of the soil in the Tanah Kampung District in Sungai Penuh City. In this case, the method used is the HVSR microtremor method. HVSR is a method of comparing the spectrum of the horizontal component to the vertical component of a microtremor wave that recorded by seismograph. HVSR parameters were used to calculated shear wave velocity (Vs30) to defined site class. It reveals this areas classified in site class SC and SD. The area is predominantly composed of SD. This areas are characterized by soft sediments that require special handling if heavy infrastructure development is planned above them. This can be done by compacting the soil layers and mixing them with limestone.

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