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All Journal JLBG (Jurnal Lingkungan dan Bencana Geologi) (Journal of Environment and Geological Hazards) Jurnal Sains Dan Teknologi (SAINTEKBU) PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL)
Ahmad Basuki
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Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Environmental Science Library & Information Science Physics Other

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Gejala awal letusan Gunung Lokon Februari 2011 - Maret 2012 Kristianto Kristianto; Hendra Gunawan; Nia Haerani; Iyan Mulyana; Ahmad Basuki; Sofyan Primulyana; Farid Uskanda Bina
Jurnal Lingkungan dan Bencana Geologi Vol 3, No 3 (2012)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1400.899 KB) | DOI: 10.34126/jlbg.v3i3.42

Abstract

ABSTRAKGunung Lokon memiliki karakter erupsi yang diawali oleh letusan freatik yang berlangsung beberapa bulan dan biasanya berakhir dengan letusan magmatik yang berlangsung singkat. Aktivitas tahun 2011 diawali oleh letusan freatik pada 22 Februari 2011 dan berulang pada 26 Juni 2011. Pada Juli 2011 kejadianletusan semakin intensif. Sampai dengan Maret 2012 letusan terjadi setiap bulan. Gejala awal setiap periode letusan diamati secara visual serta instrumental dengan menggunakan metoda kegempaan, geokimia, dan deformasi. Pengamatan kegempaan menunjukkan bahwa setiap kejadian letusan selalu diawali oleh peningkatan jumlah gempa vulkanik dangkal dan gempa hembusan serta membesarnya amplituda tremor. Fenomena tersebut menunjukkan bahwa terjadi peningkatan tekanan fl uida sebelum letusan. Peningkatan tekanan fl uida terjadi akibat proses pelepasan gas yang diikuti proses pembentukan sumbat lava yang menyebabkan kelebihan tekanan dalam konduit, ditandai dengan peningkatan gempa vulkanik dangkal. Erupsi eksplosif terjadi jika tekanan menurun secara tiba-tiba akibat rekahan pada sumbat lava. Hasil pengamatan kegempaan berkorelasi dengan hasil pengukuran deformasi yang menunjukkan adanya pemendekan dan hasil pengukuran nilai fl ux SO2 yang turun menjelang letusan.Kata kunci: letusan, freatik, gempa vulkanik dangkal, gempa hembusanABSTRACTThe characteristics of Lokon eruption is preceded by phreatic eruptions that lasted within several months and usually ends with a short magmatic eruption. The activity in 2011 was preceded by phreatic eruption on 22 February and repeated on 26 June. In July 2011, the eruptions occurred more intensively. As of March 2012 the eruption occured every month. The precursor of each eruption period was observed visually and instrumentally using seismicity, geochemistry and deformation methods. Seismicity observation showed that every eruption event was preceded by the increase in number of shallow volcanic and gasemission earthquakes and enlargement of tremor amplitude. These phenomena indicated that an increase in fluid pressure occurred prior to eruptions. The increase in fl uid pressure occurred due to gas release process followed by lava plug formation that causes over pressure of the magma in the conduit, whichwas characterized by the increase in shallow volcanic earthquakes. Explosive eruption occurs when the pressure decreases suddenly due to lava plug cracking. The results of seismicity observation correlate
Prekursor peningkatan kegiatan Gunung Tangkubanparahu pada Agustus – September 2012 Ugan Boyson Saing; Ony K. Suganda; Iyan Mulyana; Ahmad Basuki
Jurnal Lingkungan dan Bencana Geologi Vol 4, No 2 (2013)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (5390.261 KB) | DOI: 10.34126/jlbg.v4i2.52

Abstract

ABSTRAKPada 23 Agustus 2012 status Gunung Tangkubanparahu dinaikkan dari Normal (Level 1) menjadi Waspada (Level 2) karena adanya peningkatan aktivitas di Kawah Ratu. Prekursornya meningkat secara seismik, visual, temperatur solfatara, geokimia, dan deformasi. Saat kondisi normal, kegempaan Gunung Tangkubanparahu didominasi oleh gempa vulkanik dangkal (VB) berkisar 5 kejadian per hari, sedangkan vulkanik dalam (VA) kurang dari 1 kejadian per hari. Setelah peningkatan kegiatan, tremor menerus muncul, gempa vulkanikdangkal pada 12 – 20 Agustus 2012 meningkat menjadi 9 – 18 kejadian per hari. Saat status normal, tinggi asap solfatara Kawah Ratu antara 20 – 50 m di atas dasar kawah. Setelah meningkat status Waspada pada 24 Agustus 2012 tinggi asap solfatara menjadi 50 – 100 m dari dasar kawah. Temperatur solfatara dari 106,3o C pada 18 Agustus 2011 naik menjadi 246,0o C pada 24 Agustus 2012 dan 286,0o C pada 11 September 2012. Fluks SO2 solfatara Kawah Ratu dari 0,15 ton/hari pada 24 Agustus 2012 naik menjadi 1,85 ton/hari pada 6 September 2012. Rasio Cl/SO4 dari 0,11 pada Desember 2011 naik menjadi 3,98 pada 24 Agustus 2012 dan 3,52 pada 11 September 2012. Deformasi EDM (PARK – LRNG) mengalami pemanjangan jarak miring (slope) sebesar 2,30 cm pada 9 – 16 September 2012. Bila dibandingkan dengan data GPS bulan Agustus 2012, deformasi GPS pada bulan September 2012 menghasilkan perubahan nilai vektor horizontal sebesar 1,22 – 8,97 cm dengan arah vektor dominan ke luar Kawah Ratu.Kata kunci : gempa vulkanik, solfatara, fluks SO2, rasio Cl/SO4, deformasiABSTRACTOn August 23, 2012 Alert level of Tangkubanparahu Volcano raised from Normal (Level 1) to Level 2 due to an increased activity in the Kawah Ratu. In addition to increasing activity shown by seismic precursors, also improved visually, solfatara temperature, geochemical, and deformation. In normal condition, seismicity of Tangkubanparahu is dominated by shallow volcanic earthquake less than 5 events per day, whereas the deep volcanic earthquake less than 1 event per day. After the increasing activity, continuous tremor appears, number of shallow volcanic earthquake increased on 12 to 20 August 2012 to 9-18 events per day. In Normal status, solfatara plume height of Kawah Ratu was 20-50 m above the bottom of the crater, after increasing on August 24, 2012 (Level 2) solfatara plume height be  50-100 m from the bottom of the crater. Solfatara temperature was 106.3° C on August 18, 2011 raised to 246.0° C on August 24, 2012 and 286.0° C on September 11, 2012. SO2 flux of Kawah Ratu solfatara of 0.15 tonnes/day on August 24, 2012 increased to 1.85 tonnes/day on September 6, 2012. Cl/SO4 ratio of 0.11 in December 2011 raised to 3.98 on August 24, 2012 and 3.52 on 11 September 2012. Lengthening of slope distance of PARK - LRNG was 2.30 cm from 9 to 16 September 2012. Compared to the August 2012 GPS data, deformation on September 2012 changes in the value of the horizontal vector of 1.22 to 8.97 cm with the dominant vector outward from theKawah Ratu Crater.Keywords: volcanic earthquake, solfatara, SO2 flux, Cl/SO4 ratio, deformation
Studi awal fenomena kematian ikan di Danau Ranau, Sumatra Selatan Akhmad Zaennudin; Ahmad Basuki; Agus Solikhin; Ugan B. Saing
Jurnal Lingkungan dan Bencana Geologi Vol 2, No 2 (2011)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (5109.329 KB) | DOI: 10.34126/jlbg.v2i2.23

Abstract

SARIFenomena kematian ikan di Danau Ranau sering terjadi baik dalam skala kecil maupun besar dalam kurun waktu puluhan tahun. Setiap fenomena ini terjadi diawali oleh perubahan warna air danau yang semula jernih menjadi keruh berwarna putih susu pada beberapa lokasi yang kemudian menyebar ke seluruh wilayah danau. Berdasarkan penyelidikan perubahan warna air tersebut terjadi akibat munculnya gas-gas vulkanik ke permukaan kemudian bereaksi dengan air danau. Semakin lama perubahan warna tersebut semakin banyak ikan yang mati. Pada awal April 2011 terjadi dalam skala cukup besar yang mematikan ribuan ikan baik yang dipelihara di dalam jala apung maupun ikan liar yang hidup bebas di danau tersebut. Penyelidikan dengan metoda geokimia dan seismik dapat mendeteksi adanya hubungan aktivitas kegempaan dengan emisi gas sulfur atau gas magmatik lainnya yang muncul ke permukaan melewati zona sesar yang ada pada wilayah ini.Kata kunci: Fenomena, kematian ikan, Ranau, gas vulkanikABSTRACTThe death of the fish phenomena in Lake Ranau often occurred either in small or large scales within ten of decades. Each of these phenomena preceded by discoloration of the lake water which was clear becomes cloudy white at several locations, which then spread throughout the lake. Based on investigation, the discoloration of the lake water was caused by the appearance of volcanic gases onto the surface and than react with the lake water. The longer the change of the lake water color, the more fish die. In early April 2011 occurred in a larger scale thousands of fish that were kept in floating nets and wild fish in the lake died Geochemical and seismic investigation methods can detect the relationship between seismic activity and sulfuric gas emissions or other magmatic gases that come out onto the surface through fault zone found in the area.Keywords: phenomena, the death of the fish, Ranau, volcanic gases
PERENCANAAN DAN PEMBUATAN PROGRAM ADMINISTRASI JURUSAN TELEKOMUNIKASI BERBASIS JARINGAN KOMPUTER Ahmad Mujib; Anas Farobi; Ahmad Basuki; Nanang Syahroni
SAINTEKBU Vol 1 No 2 (2008)
Publisher : KH. A. Wahab Hasbullah University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (308.472 KB) | DOI: 10.32764/saintekbu.v1i2.82

Abstract

Pengelolaan administrasi yang ada di sebuah pendidikan meliputi banyak hal. Salah satunya adalah pengelolaan administrasi jurusan, meliputi; absensi mahasiswa, absensi dosen, judul proyek akhir dan lain-lain yang akan membutuhkan tenaga, waktu dan tempat yang banyak bila dikerjakan secara konvensional. Permasalahan semacam itu harus diatasi dengan adanya suatu sistem terpadu yang mampu menangani data dalam jumlah besar dan dapat diolah kapan dan dimana saja oleh seorang administrator.
DENTIFICATION OF VOLCANIC EARTHQUAKE TYPES BASED ON SEISMIC RECORDING DATA FROM MOUNT SINABUNG USING PRINCIPAL COMPONENT ANALYSIS: IDENTIFIKASI JENIS GEMPA VULKANIK BERDASARKAN DATA REKAMAN SEISMIK PADA GUNUNG SINABUNG MENGGUNAKAN PRINCIPAL COMPONENT ANALYSIS Bagas Anwar Arif Nur; Bambang Heru Iswanto; Mohammad Hasib; Ahmad Basuki
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol. 13 (2025): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2024
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/03.1301.FA11

Abstract

Volcanic eruptions are natural events that have the potential for significant damage to humans and the environment. Identifying the type of volcano earthquake is key in disaster risk mitigation by providing information on the process and the location of magma activity beneath the volcano. In this research, we propose an approach using Principal Component Analysis (PCA) to identify types of volcanic earthquakes based on seismic recording data. Identification begins by reducing feature dimensions using Principal Component Analysis (PCA). The PCA results were then clustered and then evaluated Silhoutte Score, ARI, CH-Indeks, DB-Indeks. Experiments were carried out using recorded data totaling 329 samples. For each recording, feature extraction was carried out in the form of statistical features, entropy features and shape features with a total of 16 features in the time and frequency domains. PCA results on the two main components PC1 explained 49.2741% and PC2 24.5507% of the data variance and evaluation results using Silhouette Score were equal to 0.53, ARI 0.8, CH-Index 529.34, and DB- Index 0.6
Co-Authors Achmad, Fariz Agus Solikhin Ahmad Mujib Akhmad Zaennudin Anas Farobi Bagas Anwar Arif Nur Bambang Heru Iswanto Farid Uskanda Bina Iyan Mulyana Kristianto Kristianto Mohammad Hasib Nanang Syahroni Nia Haerani Ony K. Suganda Sofyan Primulyana Ugan B. Saing Ugan Boyson Saing