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All Journal Jurnal Geologi dan Sumberdaya Mineral Jurnal HIDROPILAR
Prihadi Sumintadireja, Prihadi
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Earth & Planetary Sciences Education Energy Engineering Environmental Science

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Pemetaan Geologi Gunung Api Dijital Daerah Ngebel, Madiun berdasarkan Data Reflektansi dan Suseptibilitas Magnetik Batuan Saepuloh, Asep; Andrean Saputra, Raditya; Sumintadireja, Prihadi
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 4 (2017): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (440.61 KB)

Abstract

This study was taken as a part of volcano geology mapping at Ngebel area including volcanostratigraphy and structural geology interpretations by optimizing the satellite remote sensing and terestrial data. Ngebel area is located at the western flank of Mt. Wilis volcanic complex, Madiun District, East Java, Indonesia. The purpose of this study is to obtain the effectiveness of atmospherically corrected satellite image of Landsat-8 OLI (Operational Land Imager) TIRS (Thermal Infrared Sensor) and rock magnetic susceptibility for identifying volcanic products. The Landsat-8 OLI/TIRS image processing is performed in two steps: pre and post field observation. The pre field observation step was treated by processing and analysing the Landsat-8 OLI/TIRS to produce geomorphological units, circular/linear feature, rock unit boundary, and interpreted eruption center by examining image color, tone, and texture. Furthermore, the reflectance spectra analyses of Landsat-8 OLI/TIRS were obtained to define detailed volcanic product unit boundary after the field observation performed. Magnetic susceptibility of the rocks was used to classify the volcanostratigraphic units based on their magnetization degree of the induced rocks. Considering the  magnetic susceptibility, there are suggested two groups of volcanic unit or Hummocks (Gumuk): Hummock of Ngebel with low susceptibility (9.9×10-3 – 20.7×10-3) and Hummock of Manyutan with medium (20.7×10-3 – 48.7×10-3) to high susceptibility (≥48.7×10-3). Noticing the reflectance spectra of Landsat-8 OLI/TIRS, it can be defined five volcanic rock units: pyroclastic fall Ngebel (reflectance value at  0.63 – 0.71), pyroclastic flows Ngebel (reflectance value at 0.71 – 0.74),  pyroclastic flow Manyutan (reflectance value at 0.74 – 0.78), lava Manyutan 1 (reflectance value at 0.78 – 0,84), and Lava Manyutan 2 (reflectance value at  ≥0.84).Keyword: Volcanostratigraphy, Landsat-8 OLI/TIRS, magnetic susceptibility, reflectance, Ngebel
Pengolahan Data Magnetik Laut Terkoreksi Diurnal Base Station (Studi Kasus Perairan Pusong Kuala Langsa - Aceh) Sutikwo, Sutikwo; Sumintadireja, Prihadi; Saroso, Saroso; S. Mulyadi, Dikdik
Jurnal Hidropilar Vol. 2 No. 1 (2016): JURNAL HIDROPILAR
Publisher : Sekolah Tinggi Teknologi Angkatan Laut (STTAL)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (841.922 KB) | DOI: 10.37875/hidropilar.v2i1.40

Abstract

Indonesia merupakan negara kepulauan yang sebagian besar wilayahnya adalah perairan, maka segala aktivitas di laut menjadi bagian penting bagi kehidupan masyarakat Indonesia. Hal ini menuntut sumber daya manusia yang mempunyai kemampuan lebih tentang ilmu hidrografi dan geologi laut. Kegiatan utama penerapan ilmu geologi laut bertujuan untuk memperkirakan struktur geologi bawah laut sebagai informasi dalam keselamatan pelayaran. Penyajian informasi tentang keberadaan benda-benda bawah laut memerlukan perangkat lunak seperti Oasis Montaj, Magpick, Surfer dan perangkat pendukung lainnya. Proses pengolahan data kemagnetan ada beberapa tahapan dan metode yang digunakan dalam mempermudah dalam intepretasi, diantaranya melakukan beberapa koreksi seperti koreksi diurnal dengan data magnetik hasil pengamatan dari base station, koreksi IGRF, reduksi ke ekuator dan koreksi-koreksi lainnya. Hasil pengolahan data magnetik yang dikoreksi dengan diurnal base station dan tanpa koreksi diurnal base station pada studi kasus di perairan Pusong Kuala Langsa Aceh terdapat perbedaan nilai anomali magnet.
Co-Authors Luky Adrianto Raditya Andrean Saputra, Raditya S. Mulyadi, Dikdik Saroso, Saroso Sutikwo, Sutikwo