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All Journal Bulletin of Scientific Contribution : Geology IJOG : Indonesian Journal on Geoscience Jurnal RISET Geologi dan Pertambangan Phi : Jurnal Pendidikan Fisika dan Terapan Jurnal Geocelebes BULLETIN OF THE MARINE GEOLOGY Sawala : Jurnal pengabdian Masyarakat Pembangunan Sosial, Desa dan Masyarakat Indonesian Journal of Physics (IJP) Jurnal Material dan Energi Indonesia Jurnal Ilmu dan Inovasi Fisika Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Jurnal Geosaintek
Asep Harja
Universitas Padjadjaran
Religion Arts Astronomy Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Physics Social Sciences Other

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Analysis Of The Audio-Magnetotelluric (AMT) Data Quality Using The Coherence Parameter at Malabar Mountains Kusuma, Nabila Putri; Rahmawati, Nabilah; Hanifah, Shofie Dzakia; Harja, Asep; Lucki Junursyah, Gusti Muhammad
Phi: Jurnal Pendidikan Fisika dan Terapan Vol 10, No 2 (2024)
Publisher : Universitas Islam Negeri Ar-Raniry

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/p-jpft.v10i2.24360

Abstract

Noise recorded during measurements can diminish the quality of AMT data. This can lead to decreased penetration depth and unreliable 1D inversion models. This study aimed to reduce noise and improve data quality by analyzing coherence, curve trend, and skewness. Coherence analysis was performed using robust processing and XPR editing, yielding an average coherence value of 77.5%, an improvement of 10.8% from the raw data. Noise can also alter data dimensionality; hence, skewness analysis was used to determine the effect of distortion on the impedance tensor. Results showed that the 3D dimensionality effect at 6 stations was significantly reduced following coherence and curve trend analyses.
Geophysical Investigation of Buried Small Fault Beneath Western Mount Malabar Using Electrical Resistivity Tomography in The Great Bandung Basin Rim Susanto, Kusnahadi; Harja, Asep; Ma’arif, Farham Rezqi; Mukhtar, Husneni
Indonesian Journal on Geoscience Vol. 11 No. 3 (2024)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.11.3.409-421

Abstract

This article presents the discovery of a buried fault beneath the soil layers in the Mt Malabar area, which complements the information on suspected faults on the previous geological maps. Using an Electrical Resistivity Tomography (ERT) method, this study aims to delineate the layer discontinuity as a fault and describe the subsurface geology. This study employed a 1400 m long ERT line as the main line to identify buried fault traces, while each ERT line has an 800 m long installation across the main ERT line to obtain the direction of the minor fault. The investigation found a minor fault in the rock layer at a high resistivity layer, approximately 160 m below the surface. The identified rock units are believed to include sandy clay in the upper layer, followed by tuff, sandstone, and basalt lava in the lower layer because its resistivity value is above 250 Ohm.m. The 3D ERT model interpreted a minor buried fault as a weak zone beneath the soil and obtained the fault strike at approximately N 310°E and dipping 66°. Furthermore, these results are strengthened by the geological map, which confirms that ERT L-1 and ERT L-3 profiles coincide with a suspected fault in the Qmt rock unit area.
INVESTIGASI LAPISAN BATUAN KAWASAN PENDIDIKAN UNIVERSITAS PADJADJARAN JATINANGOR BAGIAN UTARA BERDASARKAN ELECTRICAL RESISTIVITY TOMOGRAPHY (ERT) Susanto, Kusnahadi; Azzam, Muhammad Zharfan; Syarafina, Zhafirah Nurul; Kirana, Kartika Hajar; Dharmawan, Irwan Ary; Harja, Asep
Bulletin of Scientific Contribution Vol 21, No 2 (2023): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v21i2.48042

Abstract

Pemeriksaan lapisan batuan serta kondisi bawah permukaan memegang peran yang sangat penting dalam upaya pemanfaatan lahan, baik untuk mendukung infrastruktur diatasnya maupun pemanfaatan sumber daya alam yang terkandung didalamnya. Pemanfaatan lahan berhubungan erat dengan pengembangan infrastruktur yang direncanakan. Agar dapat mengurangi risiko potensial dari bencana, penting untuk memperhatikan kualitas dan kemampuan dukungan lahan yang diperlukan. Artikel ini mengulas tentang hasil studi mengenai identifikasi lapisan batuan yang dilakukan kampus Universitas Padjadjaran Jatinangor di bagian utara. Metode yang digunakan dalam penelitian ini adalah metode Electrical Resistivity Tomography (ERT) karena merupakan metode yang memiliki resolusi yang baik dalam pengukuran geofisika dangkal. Data yang dihasilkan dari pengukuran ini adalah penampang kontras resistivitas tanah dan batuan yang berasosiasi pada berbagai aspek seperti kandungan air dalam pori, jenis batuan serta struktur bawah permukaan. Pengukuran ERT dilakukan dengan membuat 11 lintasan baik yang saling memotong maupun saling sejajar. Hasil pengukuran geolistrik resistivitas di daerah penelitian ini menunjukkan variasi kontras tahanan jenis batuan mulai dari 0,5 Ωmeter sampai lebih dari 500 Ωmeter, namun demikian dalam interpretasi yang kami lakukan, rentang nilai tersebut dibagi menjadi beberapa rentang kategori yang disesuaikan dengan maksud penelitian serta kondisi lapangan yang sedang diteliti. Hasil interpretasi terhadap data resistivitas memunculkan informasi dugaan tiga lapisan batuan di antara kedalaman 0 sampai dengan 70 dan struktur patahan minor di sekitar daerah penelitian.  
Identification of Deep Aquifer Depth in Lava Fan Area, Haruman Peak, Malabar Mountains Based on Audio Magnetotelluric Sounding Harja, Asep; Hanifah, Shofie Dzakia; Rahmawati, Nabilah; Kusuma, Nabila Putri; Junursya, G. M. Lucki
JIIF (Jurnal Ilmu dan Inovasi Fisika) Vol 9, No 2 (2025)
Publisher : Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/jiif.v9i2.65355

Abstract

Haruman Peak, located in the southern region of the Bandung Basin, is one of the summits of the Malabar Mountains. This mountain range functions as a significant recharge area for the Bandung-Soreang Groundwater Basin, a role supported by its dense vegetation cover, high precipitation, and slopes that facilitate direct runoff into the basin. Previous studies have identified the presence of shallow aquifers in the Haruman Peak area at depths of less than 40 meters. This study aims to investigate the existence of deeper aquifer systems in the Haruman Peak area using the Audio-Magnetotelluric (AMT) method. AMT data were acquired at three measurement points located on the northern side of a suspected fault zone. The inversion of the AMT data yielded one-dimensional (1D) resistivity models that provide insight into the subsurface structure. These models were used to interpret the lithological composition and to delineate potential aquifer zones. The subsurface stratigraphy in the study area is interpreted to consist of soil, Malabar–Tilu Volcanics (Qmt), and the Waringin–Bedil Andesite Formation, also referred to as Old Malabar (Qwb). The results indicate the presence of deep aquifers at measurement points MB-01 and MB-02, at estimated depths of approximately 1,322 meters and 804 meters, respectively. At point MB-03, a shallow aquifer was identified within a soil layer at a depth of less than 100 meters.
1D Audio Magnetotelluric Modelling for Deep Aquifer Identification in the Lava Fan Area of Haruman Peak, Malabar Mountains Rahmawati, Nabilah; Kusuma, Nabila Putri; Hanifah, Shofie Dzakia; Junursyah, G.M. Lucki; Harja, Asep
JURNAL GEOCELEBES Vol. 8 No. 1: April 2024
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/geocelebes.v8i1.33969

Abstract

The Malabar Mountains area acts as a catchment and infiltration zone for rainwater. Haruman Peak is the location of one of these areas. Information on the well-preserved depth of the shallow aquifer at 40 meters reinforces this. This research reviews the results of subsurface 1D resistivity structures from AMT data to obtain information on the depth of deep aquifers on the western slope of the Haruman Peak Lava Fan, Haruman Mountains. 1D modelling shows an aquifer at depth of 140.56-2080.07 meters with resistivity ranging from 5.25-68.08 Ωm. At depths of 453.32 m (HR02), 530.8 m (HR03), 1464.97 m (HR01), and 2080.07 m (HR02), interbedded tuff-andesite with minor pumice identifies the deep aquifer. In addition, a depth of 140.56 m (HR02) with a resistivity value of 68.08 Ωm indicates a shallow aquifer. Looking at the elevation of the Bandung Basin, water from aquifers located at elevations > 700 meters above sea level will flow into the Bandung Basin.
KARAKTERISASI LAPISAN BAWAH PERMUKAAN LERENG HASIL PERGERAKAN SESAR LEMBANG MENGGUNAKAN ELECTRICAL RESISTIVITY TOMOGRAPHY PADA SAG POND MURIL Silmi Afina Aliyan; Kusnahadi Susanto; Totok Doyo Pamungkas; Haikal Muhammad Ihsan; Asep Harja; Dini Fitriani; Yudi Rosandi
Jurnal Geosaintek Vol. 11 No. 2 (2025)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25023659.v11i2.2224

Abstract

Keberadaan Sesar Lembang turut berperan dalam pembentukan morfologi struktur di wilayah Cisarua, Jawa Barat. Salah satu morfologi yang terbentuk di wilayah tersebut adalah punggungan tertekan dan sag pond di Desa Muril, Kecamatan Cisarua. Peristiwa longsor juga mengiringi pembentukan morfologi ini yaitu ketika terjadi pergerakan sesar. Karakterisasi profil morfologi dapat dilakukan dengan metode geofisika dangkal dengan tujuan untuk mengidentifikasi lapisan bawah permukaan dan keberadaan patahan pada area sag pond, keberadaan patahan tidak teridentifikasi yang terdapat di bawah permukaan tanah berpotensi merusak kawasan permukiman. Metode yang digunakan untuk karakterisasi morfostruktur adalah tomografi resistivitas listrik. Validasi metodologi ini memperhitungkan pengumpulan data menggunakan peralatan resistivitas Super Sting RS8, pengolahan data dengan software inversi RES2DINV, dan interpretasi profil listrik. Konfigurasi geometri Wenner-Schlumberger digunakan dalam pengumpulan data ERT. Nilai resistivitas longsoran adalah 31,25 - 214 Ωm. Lapisan atas merupakan massa longsoran dan lapisan bawah ditafsirkan sebagai substrat kemungkinan berbatu. Permukaan geser atau bidang patahan diperkirakan berada pada kedalaman 0 hingga ±120 meter, dengan bidang barat cenderung menurun dibandingkan dengan bidang timur. Profil sisi utara-timur laut menunjukkan kedalaman yang lebih besar, yang menunjukkan akumulasi material longsor di bawah zona longsor selatan-barat daya.
Two-Dimensional Resistivity Structure and Deep Aquifer Characterization in the Haruman Volcanic Area, West Java, Indonesia: An Audio Magnetotelluric Investigation Harja, Asep
JIIF (Jurnal Ilmu dan Inovasi Fisika) Vol 10, No 2 (2026)
Publisher : Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/jiif.v10i2.72186

Abstract

Groundwater availability in volcanic terrains is strongly controlled by lithological heterogeneity, structural discontinuities, and the hydraulic characteristics of volcanic deposits. The western slope of Mount Haruman, located within the southern recharge area of the Bandung–Soreang Groundwater Basin, represents an important groundwater catchment in West Java, Indonesia. Previous hydrogeophysical investigations using DC resistivity successfully identified shallow unconfined aquifers at depths less than 40 m; however, the geometry and continuity of deeper groundwater systems remain poorly understood. This study employs the Audio Magnetotelluric (AMT) method to delineate the distribution of deep aquifers beneath the Haruman volcanic complex. Six AMT stations were acquired using a Phoenix MTU-5A system. Time-series data were processed through robust remote-reference techniques, transformed into the frequency domain, and inverted using one-dimensional Occam inversion and two-dimensional inversion implemented in WinGLink software. The resulting resistivity models reveal significant lateral and vertical variations associated with volcanic lithological sequences. Low- to moderate-resistivity zones are interpreted as permeable volcanic tuffs and fractured volcanic rocks saturated by groundwater, whereas high-resistivity bodies correspond to compact lava flows and volcanic breccias acting as aquifuges. The interpreted deep aquifer system extends considerably deeper than previously reported shallow groundwater systems, indicating multiple groundwater-bearing horizons within the volcanic sequence. These findings demonstrate that AMT provides an effective approach for imaging deep groundwater systems in complex volcanic environments and contributes valuable information for sustainable groundwater exploration and conservation within the Bandung Groundwater Basin.
Co-Authors A.A. Ketut Agung Cahyawan W Aldinofrizal Aldinofrizal Azzam, Muhammad Zharfan Bambang Wijatmoko Berliana Ayu Aprilia Budy Santoso Davala Attirmizzy Duvanovsky Dini Fitriani Doddy Sutarno Eddy Supriyana Eddy Supriyana Eddy Zulkarnaini Gaffar Edwin Parlindungan Eleonora Agustine Farham Rezqi Ma'arif M G.M. Lucki Junursyah, G.M. Lucki Gusti Muhammad Lucki Junursyah Haikal Muhammad Ihsan Hanifah, Shofie Dzakia Hidayat Hidayat Husneni Mukhtar Ilham Arisbaya Imran Hilman Mohammad Irwan Ary Darmawan Irwan Ary Dharmawan Junursya, G. M. Lucki Kartika Hajar Kirana Kusna Susanto Kusnahadi Susanto Kusnahadi Susanto, Dini Fitriani Kusuma, Nabila Putri Lucki Junursyah, Gusti Muhammad Maryo Dwi Nanda Ma’arif, Farham Rezqi Muhammad Abdilllah Budianto Nadhira Gunawan Popy Dwi Indriyani Rahmawati, Nabilah Rifky Nauval Silmi Afina Aliyan Syarafina, Zhafirah Nurul Totok Doyo Pamungkas Tsuneomi Kagiyama Tumpal Bernhard Nainggolan WAHJU GUNAWAN Wahyu Gunawan Wahyu Srigutomo Yanti Rubiyanti Yayat Sudrajat Yudi Rosandi Zhilal Ikhwana Shafa