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All Journal Jurnal Ilmiah Teknik dan Sains (JITS) Globe: Publikasi Ilmu Teknik, Teknologi Kebumian, Ilmu Perkapalan Venus: Jurnal Publikasi Rumpun Ilmu Teknik
Adelia Saras Nugraheni
Unknown Affiliation
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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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.
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