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All Journal Eksakta : Berkala Ilmiah Bidang MIPA Geosfera: Jurnal Penelitian Geografi
Laeiq, Nazish
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Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Education Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Social Sciences

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Exploring Cosmological Dynamics: From FLRW Universe to Cosmic Microwave Background Fluctuations Nasution, Budiman; Ritonga, Winsyahputra; Siagian, Ruben Cornelius; Harahap, Veryyon; Alfaris, Lulut; Muhammad, Aldi Cahya; Laeiq, Nazish
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 24 No. 04 (2023): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/eksakta/vol23-iss04/427

Abstract

This study explores key aspects of cosmology, starting with the foundational FLRW equations that describe the universe's evolution, emphasizing its homogeneity and isotropy. We incorporate mass viscosity into these equations, shedding light on its role in shaping the universe. Observations of Type Ia supernovae inform our understanding of cosmological parameters, including the Hubble rate and dark energy's effects on cosmic expansion. Cosmic Microwave Background fluctuations are analyzed for insights into cosmic structure. Baryon Acoustic Oscillations provide additional data for estimating critical parameters. We also examine the Hubble Parameter to understand its relation to cosmological parameters. Lastly, we introduce statefinder analysis, unveiling the universe's behavior through key indicators like "r" and "s." This study offers comprehensive insights into cosmology and the universe's evolution.
Correlation Between Seismicity Rates and Earthquake Return Periods in the Southern Offshore of West Java, Indonesia Alfaris, Lulut; Wahyudi, Andri; Ginanjar, Martin Anjar; Nyuswantoro, Ukta Indra; Laeiq, Nazish
Geosfera: Jurnal Penelitian Geografi Vol 4, No 2 (2025): Geosfera : Jurnal Penelitian Geografi
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/geojpg.v4i2.36433

Abstract

The Indian Ocean region south of Java constitutes a highly active seismic zone dominated by the subduction of the Indo-Australian plate beneath the Eurasian plate. This study investigates the seismicity parameters (a-value and b-value) using the Gutenberg-Richter law and estimates the return periods of significant earthquakes. Analyzing earthquake catalog data covering a span of 53 years, we identified the Magnitude of Completeness (Mc) and calculated frequency-magnitude distributions. The results reveal a b-value of 1.17, indicating a region characterized by high material heterogeneity and complex stress release mechanisms. Furthermore, the probabilistic return period for a magnitude 6.5 earthquake is estimated to be approximately 19.24 years. These findings suggest that while the region exhibits frequent moderate-magnitude energy release, the potential for destructive tsunamigenic events remains significant, necessitating robust hazard mitigation strategies for the southern coast of Java.
Seasonal Variability of Surface Ocean Currents in the Southern Java Offshore based on Global Reanalysis Data Rahman, Abdul; Alfaris, Lulut; Wahyudi, Andri; Firdaus, Anas Noor; Nyuswantoro, Ukta Indra; Laeiq, Nazish
Geosfera: Jurnal Penelitian Geografi Vol 4, No 2 (2025): Geosfera : Jurnal Penelitian Geografi
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/geojpg.v4i2.37281

Abstract

Surface ocean currents are a key component of marine circulation systems and play an important role in controlling physical and ecological processes in Indonesian sea. The Southern Java sea, which are directly connected to the eastern Indian Ocean, are characterized by dynamic surface circulation influenced by large-scale oceanic processes and seasonal monsoonal forcing. This study investigates the patterns and characteristics of surface ocean currents in the Southern Java sea using global ocean reanalysis data visualized through the Earth Nullschool platform. Seasonal variability was examined using representative monthly maps corresponding to the major phases of the Asian and Australian monsoon system, including January (West Monsoon), April (first transition season), July (East Monsoon), and October (second transition season). A descriptive analytical approach was applied to identify spatial and temporal variations in surface current direction and relative intensity across both coastal and offshore areas. The analysis reveals distinct seasonal differences in surface current behavior. During the East Monsoon period, surface currents exhibit stronger intensity and a more consistent alongshore orientation, reflecting enhanced wind-driven circulation and offshore transport. In contrast, the West Monsoon and transitional seasons are marked by weaker currents and greater directional variability, particularly in nearshore sea. These findings indicate that monsoonal wind forcing, combined with large-scale Indian Ocean circulation, is the primary driver of surface current variability in the study area. This study highlights the usefulness of reanalysis-based visualization for regional-scale oceanographic assessments in areas with limited in-situ observations. The results provide baseline information that supports regional oceanographic research and offers practical insights for marine resource management, fisheries, navigation, and coastal planning in the Southern Java sea
Co-Authors Abdul Rahman Aldi Cahya Muhammad ANDRI WAHYUDI, ANDRI Budiman Nasution Firdaus, Anas Noor Harahap, Veryyon Lulut Alfaris Martin Anjar Ginanjar Nyuswantoro, Ukta Indra Siagian, Ruben Cornelius winsyahputra Ritonga