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All Journal Jurnal Geofisika Jurnal Geosains dan Remote Sensing (JGRS) Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Jurnal Ilmiah Teknik dan Sains (JITS) Globe: Publikasi Ilmu Teknik, Teknologi Kebumian, Ilmu Perkapalan Venus: Jurnal Publikasi Rumpun Ilmu Teknik
Adelia Saras Nugraheni
Sriwijaya University
Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Education Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering Physics

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Comparison of Vs30 Value from Microtremor Data Based on SPT Drill Test of Young Merapi Deposits in Opak River, Yogyakarta Adelia Saras Nugraheni; Agung Setianto; Hendy Setiawan
Jurnal Geosains dan Remote Sensing Vol 5 No 2 (2024): JGRS Edisi November
Publisher : Department of Geophysical Engineering, Faculty of Engineering, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jgrs.ft.unila.304

Abstract

The 2006 Yogyakarta earthquake was caused by the tectonic movement of the Opak Fault, which is located near the Opak River. This research conducts microtremor data processing and analysis using the Horizontal Vertical Spectral Ratio (HVSR) method and the Inversion method to determine dominant frequency (fo), amplification (Ao), and shear wave velocity to a depth of 30 meters (Vs30) in Opak River area as an effort in earthquake disaster mitigation. The purpose of this research is to compare the Vs30 value of the inversion method using layer parameters according to Standard Penetration Test (SPT) data from previous research and layer parameters according to the number of lithologies. The result presents that the Vs30 values around Opak River are in the range of 183 - 301 m/s and belong to the stiff soil site classification. The comparison shows that the Vs30 values in the two different layer parameters are both still in the stiff soil site classification and have a slight difference in Vs30 values. Thus, the use of microseismic data to determine the Vs30 value is a fast and efficient way to determine the subsurface geology of the study area.
Modeling Of Liquefaction Potential Zone Using The Global Geospatial Model (Case Study: Special Region of Yogyakarta and Klaten Regency) Nugraheni, Adelia Saras
Jurnal Geofisika Vol 21 No 1 (2023): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36435/jgf.v21i1.529

Abstract

Liquefaction is a subsequent disaster that occurred due to an earthquake. Liquefaction that occurred in the Special Region of Yogyakarta and Klaten district after the 2006 earthquake in the form of sand and clay material bursts, changes in groundwater levels and groundwater quality in community wells. The purpose of this study was to determine the potential zones of liquefaction based on global geospatial methods in the Special Region of Yogyakarta and Klaten districts. The global geospatial method models the potential for liquefaction based on the parameters Vs30, PGA, and CTI. The model was validated with groundwater depth and subsurface lithology data based on microtremor data. The validation process produces a zone of potential liquefaction in the Special Region of Yogyakarta and Klaten district. The results showed a zone with a high potential for liquefaction occurring in the southern coastal areas of Kulon Progo and Bantul. The zone is in the alluvium formation, Vs30 180 to 270 m / s, CTI 7 to 11.5, PGA 660 to 840 gal, groundwater depth 0.26 to 4.49 masl, and dominated by sand material. Zones with high potential for the occurrence of faction are also found in the fault areas of Opak Sleman and Bantul. The zone is in the formation of the younger Merapi volcano, Vs30 180 to 3.15 m/s, CTI 7 to 13.5, PGA 960 to 1140 gal, groundwater depth 0.89 to 4.7 masl, and dominated by material earth, ash, and tuff.
Nilai Peak Ground Acceleration Pada Kecamatan Berbah, Kabupaten Sleman Adelia Saras Nugraheni
Jurnal Ilmiah Teknik dan Sains Vol. 3 No. 2 (2025): Desember: Jurnal Ilmiah Teknik dan Sains (JITS)
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat AKIPBA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62278/jits.v3i2.81

Abstract

Daerah Istimewa Yogyakarta merupakan salah satu wilayah dengan aktivitas seismik tinggi akibat keberadaannya pada zona pertemuan lempeng tektonik. Kecamatan Berbah, yang dilalui oleh Sesar Opak sebagai struktur aktif utama, memiliki tingkat kerawanan gempabumi yang signifikan. Untuk memahami potensi bahaya seismik di wilayah tersebut, penelitian ini mengestimasi nilai percepatan tanah maksimum (Peak Ground Acceleration/PGA) pada batuan dasar dan permukaan menggunakan rumus atenuasi McGuire (1977), yang sesuai untuk zona subduksi dan wilayah dengan dominasi gempa dangkal hingga menengah. Estimasi dilakukan menggunakan 110 titik pengamatan dengan jarak antar titik ±900 meter, berdasarkan parameter gempabumi Yogyakarta tahun 2006 bermagnitudo 6,3 Mw. Hasil pemodelan menunjukkan nilai PGA berkisar antara 32,3 hingga 37,4 gal dengan pola gradasi yang meningkat dari utara ke selatan. Bagian selatan Berbah memiliki nilai PGA tertinggi akibat kedekatannya dengan Sesar Opak serta keberadaan sedimen permukaan yang lebih lepas sehingga memperkuat amplifikasi gelombang seismik. Sementara itu, bagian utara menunjukkan nilai PGA lebih rendah karena didominasi litologi vulkanik muda Merapi yang lebih kompak. Temuan ini menegaskan pentingnya kajian geologi lokal dalam pemetaan bahaya seismik serta perlunya prioritas mitigasi pada wilayah selatan Kecamatan Berbah.
Variasi Nilai Peak Ground Acceleration di Kecamatan Prambanan, Kabupaten Klaten Adelia Saras Nugraheni
Venus: Jurnal Publikasi Rumpun Ilmu Teknik  Vol. 3 No. 5 (2025): Venus: Jurnal Publikasi Rumpun Ilmu Teknik
Publisher : Asosiasi Riset Ilmu Teknik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/venus.v3i5.1214

Abstract

The Special Region of Yogyakarta (DIY) is characterized by high seismic activity due to its proximity to the subduction zone and the presence of active fault systems, particularly the Opak Fault. The 2006 Yogyakarta earthquake revealed significant vulnerability in local building structures and highlighted the complex geological conditions governing seismic wave propagation. This study aims to calculate and map the Peak Ground Acceleration (PGA) distribution in Prambanan District, Klaten Regency—one of the areas closest to the 2006 earthquake source. PGA values were estimated using the McGuire attenuation relationship, based on a moment magnitude of Mw 6.3 and the hypocentral distance to 88 observation points distributed at approximately 900-meter intervals. The resulting PGA map indicates values ranging from 26.7 to 31.7 gal, with a clear spatial trend showing increasing intensity from the northern to the southern parts of the study area. Higher PGA values occur in regions near the Opak Fault and in areas dominated by unconsolidated volcanic deposits of the young Merapi formation. These loose sediments amplify seismic waves, resulting in stronger ground motion compared to areas composed of more compact sedimentary rocks. The spatial pattern of PGA corresponds well with the distribution of structural damage recorded during the 2006 earthquake. The findings emphasize the significant role of local geology and fault proximity in shaping seismic hazard levels. Consequently, this study provides essential insights for disaster mitigation strategies, land-use planning, and structural vulnerability assessment within the Prambanan area.
Nilai Peak Ground Acceleration di Kecamatan Prambanan, Kabupaten Sleman Adelia Saras Nugraheni
Globe: Publikasi Ilmu Teknik, Teknologi Kebumian, Ilmu Perkapalan Vol. 3 No. 4 (2025): November : Publikasi Ilmu Teknik, Teknologi Kebumian, Ilmu Perkapalan
Publisher : Asosiasi Riset Ilmu Teknik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/globe.v3i4.1197

Abstract

The 2006 Yogyakarta earthquake, with a magnitude of 6.3 Mw, caused severe structural damage and significant casualties, highlighting the high seismic vulnerability in the Special Region of Yogyakarta (DIY). Tectonic activity in this region is strongly influenced by the subduction of the Indo-Australian Plate beneath the Eurasian Plate and the presence of active faults, particularly the Opak Fault. Local geological conditions dominated by young volcanic deposits and unconsolidated alluvial sediments further enhance seismic wave amplification. This study aims to estimate the Peak Ground Acceleration (PGA) in Prambanan District using the empirical McGuire (1977) attenuation relationship based on parameters from the 2006 earthquake. Analysis was conducted on 113 observation points to map the spatial distribution of ground acceleration. The results indicate that PGA values range from 29.2 to 35.6 gal, with the highest values concentrated in the southern and southeastern parts of Prambanan, characterized by alluvial deposits of the Opak River. In contrast, lower PGA values occur in the northern area underlain by more consolidated young volcanic materials. These findings emphasize the significant influence of lithology and geomorphology on local site response to seismic shaking. The results provide an important basis for seismic hazard assessment and mitigation planning in Prambanan and surrounding areas.
Identification of the Capabilities of the Kerek Sandstone Unit as a Hydrocarbon Reservoir in the Karangkepoh Area and Surrounding Areas, Boyolali, Central Java Dwi Wahyu Hardiyanto; Adelia Saras Nugraheni
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 7 No. 1 (2026): Februari
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v7i1.1714

Abstract

Karanggede is part of the Kendeng Zone physiography, which was formed by compressional tectonics since the Middle Oligocene. This zone consists of deep marine to transitional sedimentary deposits with hydrocarbon reservoir potential. The Kerek Formation in the study area is dominated by layered carbonate sandstone and carbonate mudstone. The study site is located in Karangkepoh Village, Karanggede District, Boyolali Regency, Central Java. Geologically, this unit has undergone structural deformation that affects the physical properties of the reservoir rock. This study aims to evaluate the quantity and quality characteristics of the Kerek Formation carbonate sandstone as a hydrocarbon reservoir. The research methods include field observations and laboratory analysis of porosity and permeability parameters. The test results show very low porosity values, ranging from 1.53% to 1.78%. These porosity values indicate the rock's limited ability to store fluids. In contrast, the permeability values range from 98.53 mD to 906.74 mD. These permeability values are classified as good to very good. This condition indicates the presence of fluid flow paths that develop despite limited effective pore space. The relatively high permeability is controlled by grain size and inter-pore connectivity. The rock texture relationship plays a significant role in determining reservoir characteristics. Overall, the carbonate sandstone of the Kerek Formation in the study area acts primarily as a fluid-flow medium rather than a storage medium.
Co-Authors Agung Setianto Dwi Wahyu Hardiyanto Hendy Setiawan