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All Journal Buletin Sumber Daya Geologi Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
Idham Andri Kurniawan
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Chemistry Earth & Planetary Sciences Education Energy Engineering Environmental Science

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Erupsi Semeru 1 Desember 2020: Kronologi Kejadian Aliran Piroklastik, Kondisi Pre-Eruptif, dan Laju Ekstrusi Material Volkanik Banggur, Wilfridus F S; Nareswari, Ratika Benita; Saina, Nazirah; Astyka Pamumpuni; Mirzam Abdurrachman; Estu Kriswati; Liswanto; Mukdas Sofian; Yadi Yuliandi; Kristianto; Sofyan Primulyana; Idham Andri Kurniawan
Jurnal Geologi dan Sumberdaya Mineral Vol. 25 No. 3 (2024): JURNAL GEOLOGI DAN SUMBERDAYA MINERAL
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v25i3.796

Abstract

Semeru merupakan gunungapi paling aktif di Jawa dengan tipe erupsi strombolian-vulkanian yang disertai pertumbuhan kubah lava. Erupsi eksplosif Semeru dapat menghasilkan guguran lava pijar dan runtuhan kubah lava yang disertai aliran piroklastik dengan jarak luncur mencapai 5-12 km ke arah selatan (Besuk Kembar dan Besuk Bang) atau tenggara (Besuk Kobokan) dari pusat erupsi. Pada 1 Desember 2020, terjadi aliran piroklastik dengan jarak luncur 11.5 km, yang merupakan jarak luncur terjauh sejak erupsi 2002. Rekonstruksi terhadap kronologi kejadian dan sebaran endapan aliran piroklastik 1 Desember 2020 secara detil dilakukan menggunakan data CCTV, press release, citra satelit, foto drone, portal berita, dan kanal media sosial. Kondisi pre-eruptif jangka pendek dikaji menggunakan citra satelit SAR Sentinel-1, Sentinel-2 dari MIROVA, dan frekuensi kegempaan. Algoritma MODVOLC digunakan untuk mengkaji laju ekstrusi produk material volkanik sebagai gambaran kondisi pre-eruptif jangka panjang. Rekonstruksi kejadian aliran piroklastik menunjukkan bahwa erupsi dimulai dengan guguran lava yang diikuti awan panas dengan beberapa perulangan dan kekuatan yang meningkat. Kondisi pre-eruptif sepanjang tahun 2020 menunjukkan perubahan morfologi bukaan kawah pusat, posisi titik runtuh guguran lava, serta posisi akumulasi material guguran di sekitar puncak yang menyebabkan arah luncuran aliran piroklastik lebih mengarah ke Besuk Kobokan. Sementara itu, peningkatan akumulasi volume dan laju ekstrusi material volkanik mengindikasikan kemungkinan peningkatan jarak luncuran ke depannya.
CHARACTERIZATION AND SPATIAL DISTRIBUTION OF ACIDIC MINERALS BASED ON PAD 9 WELL IN THE PATUHA GEOTHERMAL FIELD, WEST JAVA: KARAKTERISASI DAN IDENTIFIKASI ZONA PENYEBARAN MINERAL ASAM PADA SUMUR PAD 9 DI LAPANGAN PANAS BUMI PATUHA, JAWA BARAT Aristo, Muhammad Kurniawan Agung; Suryantini; Idham Andri Kurniawan; Ezidin Reski; Randy Wijaya Atmaja
Buletin Sumber Daya Geologi Vol 20 No 2 (2025): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v20i2.554

Abstract

Since 2021, PT Geo Dipa Energi has drilled a total of 19 exploration wells to support the development of Patuha Unit-2. Several of these wells are located approximately 1 km from Kawah Putih, an acid vapor core chimney with a pH of less than 2, which has the potential to produce virulent fluids that contribute to the formation of acid-alteration minerals in the wells. This study aims to identify the presence of acid-type minerals, characterize these minerals, estimate their distribution zones, and interpret the formation processes based on data from wells 9-V2 and 9-Z2. The methods employed include modifications to the latest volcanostratigraphic map, macroscopic, microscopic, and XRD analyses of cutting and core samples from wells 9-V2 and 9-Z2, and mineral alteration characterization encompassing alteration type, pattern, intensity, and paragenesis. Well-to-well correlations were established based on spatial position, depth, hydrology, and volcanostratigraphy. The updated volcanostratigraphic map identifies 12 volcanic units (11 domes and 1 maar), with Kawah Putih representing the youngest unit. Identified acid-type minerals include anhydrite and diaspore. The formation of these minerals occurs through direct precipitation and replacement processes, with moderate to strong alteration intensity. Acid mineral formation is overprinted by later alteration under more neutral pH conditions. In the well group 9, the formation of acid-type minerals is interpreted to result from the lateral mixing of virulent fluids with shallow groundwater. This mixing process is characterized by the presence of calcite and other minerals enriched in Mg.  
Co-Authors Aristo, Muhammad Kurniawan Agung Astyka Pamumpuni Banggur, Wilfridus F S Estu Kriswati Ezidin Reski Kristianto liswanto Mirzam Abdurrachman Mukdas Sofian Nareswari, Ratika Benita Randy Wijaya Atmaja Saina, Nazirah Sofyan Primulyana Suryantini Yadi Yuliandi