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All Journal Indonesian Journal of Geography Jurnal Stasiun Geofisika Sleman (JSGS)
Pulo Boli, Lusia Silfia
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Earth & Planetary Sciences

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Analisis Waktu Berakhirnya Gempa Bumi Susulan Menggunakan Metode Mogi II dan Utsu (Studi Kasus Gempa Bumi Bantul 30 Juni 2023) Erni Asanti; Susanti, Dwi Budi; Pulo Boli, Lusia Silfia
Jurnal Stasiun Geofisika Sleman Vol. 2 No. 1 (2024): Jurnal Stasiun Geofisika Sleman (JSGS) - Juni 2024
Publisher : Stasiun Geofisika Kelas I Sleman

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Abstract

An earthquake with a large magnitude, such as the Bantul earthquake on June 30, 2023, has the potential to trigger aftershocks. This study aims to determine the time required to reach the stability of energy release from the earthquake, compare the decay of aftershocks using the Mogi II and Utsu methods, and identify the most accurate method for predicting the end of aftershocks based on observational data. The data used are recordings of the Bantul earthquake from SeisComP4, which were then analyzed using the equations of each method. The analysis results show differences in the end time of aftershocks (t) and correlation coefficients (r) between the two methods. The Utsu method indicates the end of aftershocks on August 4, 2023, with a correlation coefficient close to -1, indicating strong interpretation, while the Mogi II method estimates the end of aftershocks on July 29, 2023. The Utsu method is closer to the observational results, which show that the aftershocks ended on the 32nd day after the main earthquake, on July 31, 2023.
Hydrostratigraphic Model Analysis Based on Rock Resistivity Data in the Purbalingga Regency Area, Central Java, Indonesia Sehah, Sehah; Aziz, Abdullah Nur; Pulo Boli, Lusia Silfia; Addailamy, Faizah Ayu; Anas, Almas Atilya Aini; Mubarak, Fuad
Indonesian Journal of Geography Vol 57, No 3 (2025): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.104992

Abstract

The availability of groundwater for irrigation in Purbalingga Regency, requires significant attention since the region has an extensive rice field, necessitating systematic groundwater exploration and the implementation of appropriate management strategies. A geoelectrical resistivity survey has been conducted to investigate groundwater resources and to construct a hydrostratigraphic model that facilitates the interpretation of hydrogeological conditions, including aquifer distribution, groundwater depth, and productive zones. Resistivity data were collected from 16 points distributed across the districts of Kalimanah, Purbalingga, Kemangkon, and Bukateja. The correlation of resistivity logs produced detailed hydrostratigraphic cross-sections, illustrating lithological variations, layer thicknesses, and aquifer distribution. Interpretation down to a depth of 200 m identified two major formations: the Alluvium Formation and the Terrace Formation. The Alluvium Formation, consisting of sandy clay, sand, and clayey sand, exhibits resistivity values ranging from 0.87 to 69.43 Ωm, whereas the Terrace Formation, composed of tuffaceous sandstone, sand, conglomerate, and tuff, with resistivity values between 7.81 and 38.09 Ωm. Hydrostratigraphic modeling indicates that aquifer productivity varies across the study area. Kalimanah District, dominated by low-resistivity deposits (0.87–8.55 Ωm), is interpreted as having the highest aquifer productivity, making it particularly suitable for the development of groundwater-based irrigation. This study introduces a resistivity-based interpretative approach to classify hydrostratigraphic characteristics by correlating resistivity values with local geological conditions.
Co-Authors Abdullah Nur Aziz Addailamy, Faizah Ayu Anas, Almas Atilya Aini Erni Asanti Mubarak, Fuad Sehah Sehah Susanti, Dwi Budi