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All Journal JOURNAL ONLINE OF PHYSICS Jurnal Geocelebes Jurnal Teknologi dan Inovasi Industri Nemui Nyimah Scientific Contributions Oil and Gas
Andri Kurniawan
Universitas Lampung
Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Energy Engineering Environmental Science Physics Other

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STUDI KERAK DALAM SUMATERA BAGIAN SELATAN MENGGUNAKAN AMBIENT NOISE TOMOGRAFI (ANT) Destawan, Ridho; Kurniawan, Andri; Hanif, Irfan; Catur Wibowo, Rahmat
JOURNAL ONLINE OF PHYSICS Vol. 10 No. 1 (2024): JOP (Journal Online of Physics) Vol 10 No 1
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v10i1.38242

Abstract

Pulau Sumatera memiliki struktur dan tatanan tektonik yang kompleks. Letaknya yang berada pada zona subduksi menjadikannya kawasan yang memiliki jajaran gunung berapi yang membentang sejajar dengan pantai barat dan juga sesar aktif yang melewati seluruh pulau menjadikan Pulau Sumatera sebagai salah satu wilayah dengan kegempaan tinggi. Pada penelitian ini, ambient noise tomography (ANT) dilakukan untuk meningkatkan pemahaman tatanan geologi di Pulau Sumatera bagian selatan berdasarkan struktur kecepatan bawah permukaan. Ambient noise tomography adalah metode pencitraan seismik yang relatif baru yang umum digunakan untuk menyelidiki lapisan kerak bumi dan mantel atas berdasarkan variasi kecepatan seismik yang diperoleh dari ekstraksi empirical green function (EGF). Data dikumpulkan dari 20 stasiun BMKG dengan waktu perekaman selama 6 bulan pada bulan Juni - November 2015. Kurva dispersi antar stasiun yang diperoleh dengan mengkorelasikan silang dua data antara dua stasiun dan kereta dispersif terlihat jelas pada kurun waktu 10 – 40 detik. Berdasarkan hasil ambient noise tomography (ANT) pada jarak 5 – 15 km dengan anomali sedang hingga rendah pada cekungan busur belakang diinterpretasikan sebagai satuan sedimen, sedangkan anomali tinggi di sepanjang busur vulkanik diartikan sebagai tubuh batuan beku. Anomali rendah di sepanjang zona Sesar Sumatera pada kedalaman lebih dari 30 km diinterpretasikan sebagai mantel diapir yang berkembang di daerah penelitian.
Analisis Seismisitas dan Mekanisme Fokus Sesar Sumatera: Studi Kasus Segmen Semangko dan Selat Sunda Kurniawan, Andri; Wibowo, Rahmat Catur; Nurrochman, Arsy; Zaenudin, Ahmad; Wibowo, Adhi; Destawan, Ridho; Hanif, Irfan
Jurnal Teknologi dan Inovasi Industri (JTII) Vol 5, No 2 (2024)
Publisher : Fakultas Teknik, Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtii.v5i2.98

Abstract

Penelitian ini bertujuan untuk menganalisis seismisitas dan mekanisme fokus di wilayah Sesar Semangko dan Sesar Sunda, yang terletak di daerah aktif tektonik Indonesia. Dengan merelokasi 1,464 gempa bumi dari tahun 2010 hingga 2023, kami menemukan pola distribusi gempa yang lebih terfokus, terutama di sekitar Sesar Semangko. Nilai RMSCT rendah dan Conditional Number (CN) dalam rentang 59–80 menunjukkan stabilitas dan akurasi hasil. Dua kluster gempa teridentifikasi, satu di Teluk Semangko dan satu di bagian selatan, yang mendorong analisis lebih lanjut menggunakan inversi momen tensor. Hasil inversi menunjukkan dominasi aktivitas tektonik dengan proporsi 67,2% untuk Double-Couple (DC) dan 32,8% untuk Compensated Linear Vector Dipole (CLVD), serta mengonfirmasi tipe sesar sebagai strike-slip dengan arah 350°, kemiringan 55°, dan rake 179°. Penyelidikan stres prinsipal menunjukkan adanya kesamaan mekanisme antara segmen Semangko dan Sunda, yang memperlihatkan arah regangan yang halus. Temuan ini memperdalam pemahaman mengenai interaksi sesar aktif di Indonesia dan implikasinya terhadap keselamatan masyarakat. Penelitian lebih lanjut diperlukan untuk mengeksplorasi lebih dalam dinamika seismik di wilayah ini.
Shear-Wave Velocity Structure in Southeast Asia from the 2025 Mw 8.8 Kamchatka Earthquake Using Hilbert–Huang Transform Kurniawan, Andri; Dani, Ilham; Erfani, Sandri
JURNAL GEOCELEBES Vol. 9 No. 2: October 2025
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70561/geocelebes.v9i2.47278

Abstract

The 2025 Mw 8.8 Kamchatka earthquake generated long-period teleseismic surface waves recorded at stations in Australia (CTAO), Thailand (CHTO), and Indonesia (KAPI) at epicentral distances of ~6,400–8,200 km. These records provide a useful dataset to probe crust and upper-mantle structure across contrasting Southeast Asian tectonic domains. We apply the Hilbert–Huang Transform (HHT) to vertical seismograms to extract dispersion from non-stationary wave trains. Seismograms are decomposed by empirical mode decomposition, and dispersion ridges in the Hilbert spectrum are tracked to identify frequency-dependent group arrivals. Group-velocity curves are smoothed with a low-order polynomial, and dual-frequency anchors are used to enforce phase-velocity continuity. Group velocities increase from ~3.0 km/s at periods ≥150 s to ~5.5 km/s at 40–60 s, while phase velocities span 3.3–4.6 km/s. Phase-velocity curves initialized with CRUST1.0 are inverted for 1-D shear-wave velocity (Vs), indicating crustal thicknesses of ~30–40 km: thicker beneath CHTO, intermediate at CTAO, and thinner with a slower upper mantle beneath KAPI. These lithospheric variations are consistent with regional deformation inferred from GPS and InSAR. Overall, HHT yields stable dispersion measurements and reliable Vs models relative to global references, underscoring its utility in complex tectonic regions.
Membangun Masyarakat Tangguh Bencana Melalui Kegiatan Sosialisasi Sadar Bencana Dan Geowisata, Pekon Air Abang, Kec. Ulu Belu, Tanggamus Destawan, Ridho; Kurniawan, Andri; Hanif, Irfan; Ismail, Muhammad Rizky
Nemui Nyimah Vol. 4 No. 2 (2024): Nemui Nyimah Vol.4 No.2 2024
Publisher : FT Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/nm.v4i2.150

Abstract

The landslide disaster that occurred in Pekon Air Abang and Datarajan, Ulu Belu District, Tanggamus Regency on Friday 24 May 2024 evening has resulted in losses in the form of lives and material. The landslide resulted in a shack being buried under landslide material, causing one victim to be injured and another resident has not been found. Materially, the landslide disaster caused access to the main link from Talang Padang District - Ngarip District to be cut off so that the economy and logistics supplies were disrupted. Apart from that, landslides have caused residents' plantation land to be converted into unproductive land. This research aims to improve and optimize disaster mitigation and geotourism potential in the area through landslide disaster awareness outreach activities, replanting trees, and opening the Asmara Waterfall tourist access route. The result of service activities at Pekon Air Abang is high public awareness regarding disaster mitigation as seen in their participation and enthusiasm in tree planting activities and the opening of the Asmara Waterfall tourist route. Apart from that, Pekon Air Abang has become a target village for further service activities towards a disaster resilient community through education and literacy.
Identification of Potential Unconventional Oil and Gas Zones Based on Permeability, Mobility, and Transmissibility in The North-East Java Basin Bagus Sapto Mulyatno; Ordas Dewanto; Isti Nur Kumalasari; Andri Kurniawan; Asep Irawan; Andy Setyo Wibowo
Scientific Contributions Oil and Gas Vol 49 No 2 (2026)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.v49i2.2081

Abstract

The North East Java Basin is one of the prospective unconventional hydrocarbon regions characterized by low-permeability carbonate reservoirs. However, quantitative evaluation of fluid flow behavior and the relationships among petrophysical parameters within tight carbonate systems in this basin remains limited. This study aims to identify unconventional hydrocarbon prospect zones and determine the dominant fluid type based on permeability, mobility, and transmissibility parameters in the BGS-2, BGS-4, and BGS-7 wells. The study integrates well-log data, Total Organic Carbon (TOC) estimation, and interparameter relationship analysis using permeability–mobility and permeability–transmissibility crossplots. The results show that TOC values range from 0.51 to 2.78 wt%, indicating moderate to very good organic richness. The main prospective zones occur at depths of 3235–6469.5 ft (BGS-2), 3617–10632 ft (BGS-4), and 1897–1988 ft (BGS-7). These intervals are characterized by very low permeability (<0.1 mD), low mobility (<10 mD/cP), and limited transmissibility (<100 mD·ft/cP), indicating tight carbonate reservoir characteristics. Crossplot analysis reveals a stronger positive relationship between permeability and mobility than between permeability and transmissibility. The integration of petrophysical parameters indicates that gas is the dominant fluid within the prospective intervals, suggesting that carbonate reservoirs in the North East Java Basin represent promising tight-gas unconventional hydrocarbon resources.
Co-Authors Adhi Wibowo Ahmad Zaenudin Andy Setyo Wibowo Asep Irawan Bagus Sapto Mulyatno Dani, Ilham Destawan, Ridho Erfani, Sandri Hanif, Irfan Isti Nur Kumalasari M Rizky Ismail Nurrochman, Arsy Ordas Dewanto Wibowo, Rahmat Catur