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All Journal Jurnal Penelitian Sains JURNAL METEOROLOGI DAN GEOFISIKA Inersia : Jurnal Teknik Sipil
Halauddin Halauddin
Universitas Bengkulu
Chemistry Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Mathematics Physics

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STUDI FREKUENSI KRITIS (foF2) PADA LAPISAN IONOSFER YANG BERHUBUNGAN DENGAN KEJADIAN GEMPA BUMI DI SEGMEN MENTAWAI TAHUN 2010-2015 Ashar Muda Lubis; Mawaddah Mawaddah; Afrizal B.; Halauddin Halauddin; Zainal Abidin
Jurnal Meteorologi dan Geofisika Vol 22, No 2 (2021)
Publisher : Pusat Penelitian dan Pengembangan BMKG

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1106.722 KB) | DOI: 10.31172/jmg.v22i2.717

Abstract

Telah dilakukan kajian frekuensi kritis (foF2) lapisan F ionosfer untuk mencari apakah perubahan/anomali foF2 pada lapisan ini berhubungan dengan kejadian gempa bumi di segment Mentawai Sumatera Barat sehingga dapat digunakan sebagai prekusor gempa bumi dalam order harian. Untuk itu data ionogram pada waktu 2005-2015 yang merupakan hasil pengamatan ionosonda tipe Frequency Modulation Continous Wave (FMCW) di stasiun Kototabang, Kabupaten Agam, Sumatra barat, kemudian data aktivitas geomagnetik melalui indeks Disturbance Storm Time Index (DST) dan data aktivitas matahari (sunspot number) telah digunakan. Sementara itu sebanyak 37 kejadian data gempa bumi (Mw > 5,5) di wilayah Mentawai yang berasal dari USGS digunakan untuk mengkaji anomali foF2 terhadap kejadian gempa bumi selama 14 hari sebelum gempa bumi terjadi. Hasil pengamatan secara umum memperlihatkan terdapat anomali foF2 pada selang 14 hari sebelum terjadinya gempa bumi. Kemunculan foF2 tersebut dapat diduga sebagai indikasi sebagai aktivitas pre-seismic dalam kulit bumi pada 37 kejadian gempa bumi di wilayah Mentawai, meskipun kadang-kadang aktivitas geomagnet dan aktivitas matahari terlihat berpengaruh anomali foF2. Oleh karena itu diperlukan kajian lanjutan untuk menguji korelasi antara anomali foF2 dan kejadian gempa bumi secara statistik.
ESTIMASI POROSITAS DAN PERMEABILITAS RETAKAN AKIBAT GEMPA BUMI TAHUN 2000 DI JALAN DANAU DENDAM BENGKULU DENGAN LATTICE GAS AUTOMATA (LGA) Halauddin Halauddin
Inersia: Jurnal Teknik Sipil Vol 8, No 1 (2016)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/ijts.8.1.17-26

Abstract

This research purposed to determine the total porosity (?) and permeability (k) of cracks result of the earthquake of 2000 years in the road of Dendam lake Bengkulu. Porosity and permeability calculations performed using the model Lattice Gas Automata (LGA) which implemented with Delphi 7.0 programming language. From the results of the calculation data, obtained that the cracks that have the greatest permeability obtained for cracks 3 with permeability values (k) is 10,115704 pixel 2 tot, and total porosity (?) for cracks 3 is 0,108565. While the cracks that have the smallest permeability obtained in the cracks 2 with permeability values (k) is 1.138247 pixel 2 tot, and total porosity (?tot) for cracks 2 is 0,087898. Simulation of fluid flow at the time of running data for a small porosity causing the collision of fluid flow models of LGA are becoming more frequent, there for causing the permeability is decreases. Otherwise, for a big porosity causing the collision of fluid model of LGA are becoming less frequent, there for causing the permeability is increases.
PENGARUH PENAMBAHAN SEKAM PADI DAN POLIMER EMULSI POLY VINYL ACECATE CO ACRYLIC PADA TANAH LEMPUNG DENGAN OBJEK PENGUJIAN KEKUATAN BATU BATA MENGGUNAKAN METODE UNIAXIAL Halauddin Halauddin
Inersia: Jurnal Teknik Sipil Vol 9, No 1 (2017)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (563.233 KB) | DOI: 10.33369/ijts.9.1.39-46

Abstract

Research on the effect of the addition of rice husk and poly vinyl acetate emulsion polymer co acrylic (PVA) on clay have been conducted to see the strength of brick. Calculation of strength compared to brick by rice husks and polymer emulsion and given rice husk without any emulsion polymer. Provision of rice husk to batter was fixed at 9:1, while the provision of PVA polymer mixture for each batter with varying percentage are 1%-7%. Based on the results of the research, showed that: uniaxial compressive strength test resultsbricks to mix rice husk without PVA emulsion polymer was 28,7kg/cm2(L0), compressive strength test results bricks to mix rice husk with PVA emulsion polymer to a mixture of 1%-7%, respectively: (PVA 1% of 28,7 kg/cm2 (L1);(PVA 2% of 28,7 kg/cm2 (L2); (PVA 3% of 28,7 kg/cm2 (L3); (PVA 4% of 28,7 kg/cm2 (L4); (PVA 5% of 28,7 kg/cm2  (L5); (PVA 6% of 28,7 kg/cm2 (L6); and (PVA 7% of 28,7 kg/cm2 (L7). From the above results show that the compressive strength test results bricks to mix rice husk with PVA emulsion polymer mix increased from 1% to 3% mix, while starting from a mixture of 4% to 7% of the compressive strength of bricks dropped dramatically. The addition of PVA 3% of additions that the most effective way to improve the compressive strength of the bricks with compressive strength reached 53,5 kg/cm2, or increase of 46,4% from a brick with a mixture ofrice husk.
Pendugaan Air Tanah (Akuifer) dengan Metode Vertical Electrical Sounding (VES) di Kelurahan Medan Baru Nabilah Rofifah; Muhammad Siaman; Ronni Samuel Saragih; Suhendra Suhendra; Jesika Erni Elfrita Sinaga; Halauddin Halauddin
Jurnal Penelitian Sains Vol 25, No 2 (2023)
Publisher : Faculty of Mathtmatics and Natural Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56064/jps.v25i2.760

Abstract

AbstrakPenelitian ini bertujuan untuk mengetahui kebaradaan akuifer air tanah di Kelurahan Medan Baru Kecamatan Muara Bangka Hulu yang di setiap perumahan mengalami masalah air tanah yang berbeda. Penelitian ini menggunakan metode VES (vertical elektrical sounding) geolistrik resistivitas sebanyak 15 titik pengukuran dengan konfigurasi schlumberger. Tahapan penelitian ini yaitu proses akuisisi data lapangan di 15 titik pengukuran kelurahan Medan Baru, kemudian pengolahan data dan interpretasi sehingga didapatkan hasil berupa keberadaan akuifer air tanah di bawah permukaan. Hasil penelitian di dapatkan yaitu pada lintasan pertama di titik VES 3 di depan Masjid lapisan akuifer terdapat pada kedalaman (8-60) meter, pada titik VES 6 lapisan akuifer terdapat pada kedalaman (7-80) meter, pada titik VES 15 lapisan akuifer terdapat di kedalaman (17-30) meter. Adapun jenis mineral yang terkandung di daerah Kelurahan Medan Baru yaitu lempung, pasir, dan kerikil. Kata kunci: akuifer, air tanah, geolistrik, medan baru, ves AbstractThis study aims to determine the existence of groundwater aquifers in Medan Baru Village, Muara Bangka Hulu Subdistrict, where each housing estate experiences different groundwater problems. This research uses the VES (vertical electrical sounding) geoelectrical resistivity method as many as 15 measurement points with schlumberger configuration. The stages of this research are the process of field data acquisition at 15 measurement points in Medan Baru village, then data processing and interpretation so that the results are obtained in the form of the presence of groundwater aquifers in the subsurface. The results of the research obtained are on the first track at VES point 3 in front of the Mosque the aquifer layer is at a depth of (8-60) meters, at VES point 6 the aquifer layer is at a depth of (7-80) meters, at VES point 15 the aquifer layer is at a depth of (17-30) meters. The types of minerals contained in Medan Baru Urban Village area are clay, sand, and gravel.Keywords: aquifers, groundwater, geoelectrical, medan baru, ves
Co-Authors Afrizal B. Ashar Muda Lubis Jesika Erni Elfrita Sinaga Mawaddah Mawaddah Muhammad Siaman Nabilah Rofifah Ronni Samuel Saragih Suhendra Suhendra Zainal Abidin