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All Journal Jurnal Bina Desa Rekayasa: Jurnal Penerapan Teknologi dan Pembelajaran
Rahma, Ilqia
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Site Classification Based on Shear Wave Velocity  from H/V Curve Inversion in Prambanan Subdistrict, Klaten Regency for Earthquake Risk Mitigation Rahma, Ilqia; Aryono Adhi, Mochamad; Budi Wibowo, Nugroho; Mustami' Limayukha, Desi; Fadlika Widyantari, Elsa; El Farsiyyi, Billqis; Sofyana Ulya, Rahmania
Rekayasa Vol. 21 No. 2 (2023)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v21i2.9863

Abstract

One of the areas that has become a historical tourist attraction in Klaten Regency is Prambanan District. Prambanan District in the south is directly adjacent to Kapanewon Prambanan which has an Opak Fault. This study aims to microzonate earthquake-prone areas based on microseismic parameters using a portable seismograph at 27 measurement points. Data analysis was performed using the Horizontal to Vertical Spectral Ratio (HVSR) method and the ellipticity curve with the help of Geopsy and Dinver software. The results showed that the range of f0 values was between 0.9 and 18 Hz, which was predominantly included in the Type I classification. The A0 values were in the range of 1.2-4 with the size of the distribution of A0 being dominantly low. The value of Kg in this area is classified as low category with a range of 0.1-14. Prambanan District has vs30 values ranging from 234–1260 m/s which are classified into 3 sites namely B, C, and D. The results of this study indicate that Prambanan District has soil with a thick layer of sediment based on information on the distribution of shear wave velocity values to depth 30 meter. These results are relevant as an effort to mitigate earthquake disasters, especially in vulnerable areas such as Prambanan which has a history of seismic activity due to the presence of the Opak Fault.
Identification of Seismic Vulnerability  in Sleman Regency Based on Site Effect Analysis  Using Microtremor Data El Farsiyyi, Bilqis; Aryono Adhi, Mochamad; Budi Wibowo, Nugroho; Mustami' Limayukha, Desi; Fadlika Widyantari, Elsa; Rahma, Ilqia; Sofyana Ulya, Rahmania
Rekayasa Vol. 21 No. 2 (2023)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v21i2.9958

Abstract

Yogyakarta is a province in the southern part of Java Island which is close to volcanoes. In this area there are sedimentary materials, such as silt, sand, tuff, breccia, agglomerate and conglomerate so that they are at risk of being affected by local site effects when an earthquake occurs. This study aims to determine earthquake vulnerable zones in several areas in Sleman Regency, including Berbah, Kalasan and Prambanan Districts based on site effect analysis with dominant frequency parameters (f0), amplification factor (A0) and seismic vulnerability index (Kg) using micro seismic data with data of 27 points which are then processed using the Horizontal to Vertical Spectral Ratio (HVSR) method and micro zonation using Geographic Information System (GIS). The results of data processing show that the site class in Sleman Regency is divided into 3, namely SD (Medium Soil), SC (Very Dense Soil) and SB (Rock). Areas with rock formations with soft soil structures are the most vulnerable areas to earthquakes. The lowest
Evaluation of Seismic Vulnerability Index and Soil Classification in Sleman Regency Based on Microtremor Analysis and the HVSR Method Fadlika Widyantari, Elsa; Aryono Adhi, Mochamad; Rahma, Ilqia; Budi Wibowo, Nugroho; Mustami' Limayukha, Desi; El Farsiyyi, Bilqis; Sofyana Ulya, Rahmania
Rekayasa Vol. 21 No. 1 (2023)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v21i1.9959

Abstract

Kalasan District and Ngemplak District, located in Sleman Regency, Yogyakarta, are areas with significant seismic risk due to the subduction of the Indo-Australian and Eurasian plates south of Java Island. To support disaster mitigation and land-use planning, it is essential to understand the local geological structure and soil dynamic response. This study aims to evaluate the seismic vulnerability and soil classification using the Horizontal to Vertical Spectral Ratio (HVSR) method and Rayleigh wave ellipticity inversion modeling. Microtremor measurements were conducted at 27 points distributed across both districts. The HVSR method was used to obtain the dominant frequency and amplification values, while the ellipticity inversion of Rayleigh waves was employed to estimate the shear-wave velocity profile and calculate Vs₃₀ values. The results show that the dominant frequency ranges from 0.713 Hz to 18.006 Hz, amplification values range from 0.569 to 4.193, and the seismic vulnerability index ranges from 0.010 to 12.060. Based on these parameters, Sleman Regency is generally categorized as having low to moderate seismic damage potential due to the relatively low amplification and vulnerability index. The Vs₃₀ values indicate a variation in soil site classes, namely medium-density soil (SD) and very dense soil (SC). These findings provide essential data for seismic microzonation, contributing to more resilient urban development strategies. 
Pelatihan Pembuatan Lampu Penerangan Otomatis di Desa Malebo dalam Pembangunan SDGs Desa Nugroho, Agung; Rahma, Ilqia; Rofi'ah, Siti Hidayatur; Amrullah, Nafis Azmi; Chamidi, Jayim
Jurnal Bina Desa Vol 5, No 3 (2023): Vol 5, No 3 (2023) : Oktober
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jbd.v5i3.41669

Abstract

Tingginya ketergantungan masyarakat terhadap penggunaan listrik tentunya menimbulkan masalah peningkatan pemborosan energi dan pengeluaran, sehingga menyebabkan ketidakmerataan terpenuhinya kebutuhan listrik. Desa Malebo merupakan salah satu desa dengan masalah serupa karena susahnya penglihatan terhadap lingkungan sekitar sebab kurangnya jumlah lampu penerangan jalan. Oleh dari itu, Tim KKN UNNES GIAT 3 Desa Malebo mengadakan pelatihan pembuatan lampu penerangan jalan otomatis dengan menggunakan sensor LDR sebagai komponen utama rangkaian lampu. Alat yang digunakan yaitu sensor LDR, lampu 7 watt, resistor 220 kΩ, transistor BT136, kabel, timah solder (tenol), fitting, steker, solder, dan obeng, sedangkan bahan yang dibutuhkan yaitu cahaya dan tegangan listrik. Kegiatan pelatihan ini diikuti oleh 25 warga Desa Malebo yang bertempat di balai desa dan berhasil dilaksanakan dengan baik dan lancar. Hasil pelatihan tersebut menunjukkan bahwa masyarakat Desa Malebo antusias dalam mengikuti kegiatan. Warga telah termotivasi mempelajari pembuatan lampu otomatis dan terdorong menjadi lebih memperhatikan permasalahan global, yaitu pemborosan penggunaan listrik.
Co-Authors Amrullah, Nafis Azmi Aryono Adhi, Mochamad Budi Wibowo, Nugroho Chamidi, Jayim El Farsiyyi, Billqis El Farsiyyi, Bilqis Fadlika Widyantari, Elsa Mustami' Limayukha, Desi Nugroho, Agung Rofi'ah, Siti Hidayatur Sofyana Ulya, Rahmania