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All Journal Teknisia JOURNAL OF CIVIL ENGINEERING, BUILDING AND TRANSPORTATION
Yunalia Muntafi
Universitas Islam Indonesia
Civil Engineering, Building, Construction & Architecture Engineering

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ANALISIS HAZARD GEMPA DKI JAKARTA METODE PROBABILISTIK DENGAN PEMODELAN SUMBER GEMPA 3 DIMENSI Yunalia Muntafi; Widodo Pawirodikromo; Lalu Makrup
TEKNISIA Vol. XX, No. 2, November 2015
Publisher : Jurusan Teknik Sipil, Fakultas Teknik Sipil dan Perencanaan, Universitas Islam Indonesia

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Abstract

History records that Jakarta as the capital of Indonesia ever rocked by a devastating earthquake in 1699, 1780, 1883 and 1903, resulting in loss of physical, mental and material. The existence of several active faults around Jakarta potentially be the source of the earthquake that shook Jakarta. Therefore, the analysis of seismic hazard for Jakarta area is needed. The study was conducted by the method of Probabilistic Seismic Hazard Analysis (PSHA) with 3D modeling of seismic source and latest attenuation equations (Next Generation Attenuation) in accordance with the method used in the manufacture of the latest earthquake map (Earthquake Hazard Map of Indonesia 2010). The aims of this research are to (1) conduct hazard analysis seismic probabilistic as a reference value of the intensity of the hazard seismicity, (2) analyze deagragasi as early determinant of modification recording time history seismic acceleration corresponding to Jakarta bedrock and (3) analyze the spectral matching which then carried the ground motion design for Jakarta. The results of seismic hazard analysis shows that maximum acceleration at bedrock (PGA) for the Jakarta area with 500-year return period amounted to 0.236 g still in the range of PGA Jakarta by Indonesian Earthquake Hazard Map of latest ISO 1726-2012 (0.20g-0.25g). This value is close to the value of the Hutapea’s research results (2009), amounting to 0.239g. However, it is higher than the proposed PGA of Irsyam et al (2008) which amounted to 0.20g, and lower than the value of PGA on Indonesian earthquake map published by the USGS in which Jakarta was in the range of 0.245g - 0.326g. Based on the deagregation analysis, obtained two sets of real-time earthquake data, namely time history of Kocaeli earthquake in 1999 and Landers earthquake in 1992 to present megathrust and shallow crustal earthquake source, then by spectral matching analysis, obtained two synthetic ground motions for each seismic source mechanisms in the period of 0.2 sec and 1.0 sec for Jakarta.
KAJIAN ANALISIS RISIKO BENCANA TANAH LONGSOR DI DESA TERONG KECAMATAN DLINGO KABUPATEN BANTUL Sri Aminatun; Yunalia Muntafi
TEKNISIA Vol. XXI, No. 2, November 2016
Publisher : Jurusan Teknik Sipil, Fakultas Teknik Sipil dan Perencanaan, Universitas Islam Indonesia

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Abstract

Bantul Regency has 16 landslides-prone villages located on the ridge morphology of the hills in the eastern region and a small part of the western region of Bantul regency. Based on the landslide map from BPBD in 2011, Terong village is one of the villages in Bantul regency which experienced high intensity of landslide, so the risk analysis of landslide in detail is needed as one of the disaster mitigation efforts in that region. This study aims to identify residents who are in the landslide threat zone, both in a high threat zone and medium threat zone. The method used in this research is descriptive method with qualitative approach used to give a clear picture about the number of citizens in each zonation. Sources of data used are primary and secondary data sources through interviews and documentation. The results of the study indicate that 1) the number of household in the high risk red zone is 1 household, in the yellow risk zone is 22 household, and in the green risk zone is 1 household; 2) Terong village has a high threat, medium vulnerability, and high capacity, which is means that it has a medium risk value.
Evaluasi Respons Dinamik dan Kerentanan Gedung Bertingkat Berdasarkan Frekuensi Natural dan Floor Spectral Ratio (Studi Kasus di Universitas Islam Indonesia) Anggit Mas Arifudin; Yunalia Muntafi
JOURNAL OF CIVIL ENGINEERING BUILDING AND TRANSPORTATION Vol. 9 No. 2 (2025): JCEBT SEPTEMBER
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jcebt.v9i2.17975

Abstract

Yogyakarta merupakan salah satu wilayah di Indonesia yang memiliki aktivitas seismik tinggi akibat interaksi lempeng tektonik dan keberadaan sesar aktif, khususnya Sesar Opak. Kondisi tersebut meningkatkan risiko kerusakan struktur bangunan bertingkat, termasuk fasilitas pendidikan. Oleh karena itu, penelitian ini bertujuan untuk mengevaluasi respons dinamik dan tingkat kerentanan beberapa bangunan bertingkat di lingkungan Universitas Islam Indonesia (UII) terhadap potensi gempa bumi. Objek penelitian meliputi Gedung Rektorat, Gedung Fakultas Psikologi, dan Gedung Fakultas Kedokteran. Penelitian menggunakan metode mikrotremor melalui pendekatan Floor Spectral Ratio (FSR) untuk menentukan frekuensi natural dan karakteristik dinamik bangunan, sedangkan metode Horizontal to Vertical Spectral Ratio (HVSR) digunakan untuk mengidentifikasi karakteristik tanah. Data diperoleh melalui perekaman mikrotremor pada 46 titik di dalam bangunan dan satu titik di permukaan tanah, kemudian diolah menggunakan analisis Fast Fourier Transform (FFT) dengan bantuan perangkat lunak Geopsy. Hasil penelitian menunjukkan bahwa frekuensi natural sebagian besar bangunan lebih besar dibandingkan frekuensi tanah sehingga bangunan umumnya tergolong aman terhadap efek resonansi. Analisis indeks resonansi menunjukkan bahwa Gedung Rektorat berada pada kategori rendah, Gedung Fakultas Psikologi kategori tinggi, dan Gedung Fakultas Kedokteran kategori sedang. Selain itu, sebagian besar nilai indeks kerentanan berada di bawah ambang kritis 100 m/s² sehingga tingkat kerentanan struktur relatif rendah. Penelitian ini memberikan implikasi bahwa analisis mikrotremor efektif digunakan sebagai metode evaluasi non-destruktif untuk mitigasi gempa dan direkomendasikan sebagai dasar pemantauan berkala kondisi bangunan kampus di wilayah rawan gempa.
Co-Authors Anggit Mas Arifudin Lalu Makrup Sri Aminatun Widodo Pawirodikromo