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All Journal Journal of Geoscience, Engineering, Environment, and Technology
Asyqari, Amir
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Earth & Planetary Sciences Engineering Environmental Science Physics

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Identifying the influence of El Nino Southern Oscillation (ENSO) and Indian Ocean Dipole (IOD) Phenomena on Rainfall in The Aceh Region, Indonesia Jannah, Miftahul; Ismail, Nazli; Asyqari, Amir; Indahsari, Fitriana N.; Abdullah, Faisal
Journal of Geoscience, Engineering, Environment, and Technology Vol. 9 No. 04 (2024): JGEET Vol 09 No 04 : December (2024)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2024.9.04.19582

Abstract

The interaction process between the atmosphere and the ocean that occurs in the Pacific Ocean and the Indian Ocean has a major impact on climate and weather conditions in Indonesia. The phenomenon that arises due to this interaction is known as El Nino - Southern Oscillation (ENSO). In addition to ENSO, other mechanisms also impact weather and climate change in Indonesia, including the Indian Ocean Dipole (IOD). This study aimed to analyze the effect of ENSO and IOD on rainfall in the Aceh region. The data used were CHIRPS rainfall data with the locations of four meteorological stations and one climatology station in Aceh, IOD index data and ENSO index data. Data processing in this study was carried out using Grid Analysis and Display System (GrADS) software and Spreadsheet for CHIRPS rainfall data, followed by processing ENSO index data and IOD index using Spreadsheet software. The analysis showed that the ENSO phenomenon has a longer occurrence than the IOD phenomenon. ENSO has a greater influence on rainfall in the Aceh region than IOD, especially La Nina, which has a weak to moderate correlation. Negative IOD and El Nino phenomena influence several observation points, but some stations do not show a correlation between rainfall and the index. The positive IOD phenomenon is strongly negatively correlated with rainfall at the observation station, which shows that positive IOD does not influence the Aceh region.
Site Characterization Based on Shear-Wave Velocity Using Multichannel Analysis of Surface Waves (MASW) Method in Urban Areas of Aceh Besar, Indonesia Darisma, Dian; Salsabila, Rifa Salma; Asyqari, Amir; Naufal, Haris Hartsa; Amsir; Asrillah; Masrurah, Zakia; Tarmizi; Marlinawati, Intan; Manalu, Kasih D; Muhni, Akmal; Azmi, Nurul
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 3 (2026): Articles In Press Vol 11 No 3 2026
Publisher : UIR PRESS

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Seismic site characterization is needed for earthquake risk mitigation and also for geotechnical infrastructure design. Multichannel Analysis of Surface Waves (MASW) can be used for seismic site characterization. The method extracts shear-wave velocity (Vs) profiles from surface wave analysis that reveal geotechnical conditions and subsurface structures. This study aims to characterize the subsurface layers using the MASW method in Aceh Besar. Data acquisition was carried out along three measurement profiles, each 69 meters long and with a receiver spacing of 3 meters. Shear-wave velocities (Vs) of the subsurface soil and rock layers were estimated using dispersion curve analysis and 1D inversion. The surface wave spectral analysis produced a high-quality dispersion at the fundamental mode frequency of 20–30 Hz. The inversion process, validated by an excellent misfit curve, yields a seven-layer Vs model with RMS values mostly below 0.01. The 2D pseudo-section models based on 1D inversion results show a subsurface stratification consisting of a soft to medium overburden (Vs < 350 m/s) layer of 15 meters thick, followed by a transition zone of dense soil, and engineering bedrock (Vs > 750 m/s) found at a depth of 30 to 40 meters. In general, lateral variations were identified as undulating bedrock topography and local basin structures. Based on SNI 1726:2019, the site is classified as Medium Soil (SD) to Very Dense Soil (SC), with an estimated Vs value influenced by the thickness of the surface sediment. These results provide a valuable overview of subsurface conditions from site characterization and can serve as a basis for geotechnical planning in the study area.
Co-Authors Amsir Asrillah Darisma, Dian Faisal Abdullah Indahsari, Fitriana N. Manalu, Kasih D Marlinawati, Intan Masrurah, Zakia Miftahul Jannah Muhni, Akmal Naufal, Haris Hartsa Nazli Ismail Nurul Azmi, Nurul Salsabila, Rifa Salma Tarmizi