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All Journal POSITRON BERKALA SAINSTEK JFA (Jurnal Fisika dan Aplikasinya) COMPTON: Jurnal Ilmiah Pendidikan Fisika
Ilham Ilham
Universitas Islam Negeri Mataram
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Education Energy Mathematics Physics

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 1 
Mapping the Potential Liquefaction Area in Yogyakarta City Based on Ground Shear Strain Data Ilham Ilham; Urip Nurwijayanto Prabowo; Sismanto Sismanto
Jurnal Fisika dan Aplikasinya Vol 17, No 3 (2021)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v17i3.9561

Abstract

The appearance of liquefaction phenomena in some places in Yogyakarta city due to the 2006 earthquake indicates that the sediment in this area has a high potential to liquefy. Three main factors that caused liquefaction are ground shaking, lithological conditions, and groundwater depth. This study aims to investigate one of the three factors i.e ground shaking. For this purpose, the ground shear strain (GSS) data were analyzed for mapping the potential liquefaction area in Yogyakarta city. They were calculated from the seismic vulnerability index and PGA. The seismic vulnerability index was analyzed from a microtremor single station data recorded in 110 sites while PGA was calculated using a reference of the 2006 earthquake. The GSS value in the study area is at a range of 2.0 × 10−4 to 5.8 × 10−3 . In this range, the soils begin to be elastic-plastic so that they are susceptible to be fracture and settlement. The high GSS correlates with the location of the liquefaction due to the 2006 earthquake. The liquefaction potential map was obtained by comparing the GSS with liquefaction sites. The high liquefaction potential is located in the southern part of Yogyakarta city covering Mantrijeron, Mergangsan, Pakualaman, Umbulharjo, and Kotagede districts.
PENGARUH MODEL PEMBELAJARAN KOOPERATIF TIPE THINK PAIR SHARE TERHADAP PRESTASI BELAJAR FISIKA POKOK BAHASAN GETARAN DAN GELOMBANG Ilham Ilham; Widodo Budhi
COMPTON: Jurnal Ilmiah Pendidikan Fisika Vol 5 No 1 (2018): COMPTON
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/cjipf.v5i1.4135

Abstract

Penelitian ini bertujuan untuk mengetahui kecenderungan prestasi belajar fisika pokok bahasan getaran dan gelombang siswa kelas VIII SMP Negeri 9 Yogyakarta tahun ajaran 2014/2015 yang diajar menggunakan model pembelajaran kooperatif tipe Think Pair Sharedan model pembelajaran konvensional.Secara komparatif untuk mengetahuipengaruh model pembelajaran kooperatif tipe Think Pair Shareterhadap prestasi belajar fisika pokok bahasan getaran dan gelombang siswa kelas VIII SMP Negeri 9 Yogyakarta tahun ajaran 2014/2015. Hasil penelitian menunjukkan bahwa kecenderungan prestasi belajar fisika siswa yang diajar menggunakan model Think Pair Shareadalah sangat tinggi sedangkan kecenderungan prestasi belajar fisika siswa yang diajar menggunakan model konvensional adalah tinggi. Hasil analisis menunjukkan bahwa ada pengaruh model pembelajaran kooperatif tipe Think Pair Shareterhadap prestasi belajar fisika pokok bahasan getaran dan gelombang siswa kelas VIII SMP Negeri 9 Yogyakarta tahun ajaran 2014/2015.
Vulnerability Analysis of Rectorate Building of UIN Mataram against Earthquakes Based on Microtremor Data Ilham, Ilham
BERKALA SAINSTEK Vol 11 No 1 (2023)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v11i1.34115

Abstract

Lombok Earthquake in 2018 caused several damages to buildings, including buildings at UIN Mataram. Therefore, it is necessary to carry out mitigation efforts to reduce losses caused by the earthquake. This study aims to analyze the level of vulnerability of the Rectorate Building of UIN Mataram based on microtremor data. Microtremor signal recording was performed using a 3-component Digital Portable Seismograph, type TDL 303S with a Feedback Short Period Seismometer sensor type DS-4A, GPS, and Laptop. The recording time for each measurement point was 40 minutes with a sampling rate of 100 Hz. The natural frequency of the Rectorate Building of UIN Mataram is 4.15 Hz for the N-S component, and 4.05 Hz for the E-W component. The natural frequency of the Rectorate Building is following the SNI (2002) standard. The resonance index value of the Rectorate Building with the surrounding land is in a low category so that the Rectorate Building is classified as safe against earthquakes. The highest building Vulnerability Index is on the 3rd floor of the Rectorate building, especially in the south wing. For disaster mitigation, the 3rd floor can be converted as a room with minimal staff to reduce the possibility of casualties in the event of an earthquake in the future.
Identifikasi Efek Tapak Lokal Menggunakan Data Mikrotremor di Kelurahan Jempong Baru, Kota Mataram Ilham, Ilham; Kafrawi, Muhammad
POSITRON Vol 14, No 2 (2024): Vol. 14 No. 2 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/positron.v14i2.69497

Abstract

Gempa Lombok tahun 2018 merupakan salah satu peristiwa gempa bumi yang merusak di Indonesia. Gempa tersebut menimbulkan banyak kerugian baik korban jiwa maupun kerusakan infrastruktur dan bangunan. Kerusakan struktur tanah dan bangunan akibat gempa bumi akan berbeda antara satu tempat dengan tempat lainnya, bahkan terkadang tidak sesuai seperti yang diperkirakan. Salah satu faktor yang dapat mempengaruhinya adalah efek tapak lokal. Penelitian ini bertujuan untuk mengidentifikasi efek tapak lokal di Kelurahan Jempong Baru, Kota Mataram sebagai upaya mitigasi bencana guna mengurangi tingkat kerusakan yang terjadi akibat bencana gempa bumi. Untuk mencapai tujuan ini, pengukuran mikrotremor single station telah dilakukan di 26 titik dengan rata-rata spasi antar titik ±500 m. Dengan menggunakan software Geopsy, data mikrotremor telah diolah menggunakan metode Horizontal to Vertical Spectral Ratio (HVSR) untuk mendapatkan frekuensi natural (f0) dan faktor amplifikasi maksimum (A0). Indeks kerentanan seismik tanah (Kg) juga telah dihitung berdasarkan nilai f0 dan A0 yang telah diperoleh. Tanah di Kelurahan Jempong Baru memiliki frekuensi natural antara 0,56 "“ 1,04 Hz dan faktor amplifikasi maksimum antara 5 "“ 15,5. Hal ini mengindikasikan adanya lapisan sedimen yang berbulir lepas, seperti loose sand, tufa, aliran lahar dan sebagainya yang sangat tebal. Indeks kerentanan seismik tanah berkisar antara 20 "“ 380 dengan nilai yang tinggi berada di bagian Timur ke arah Selatan. Kg di daerah ini tergolong sangat tinggi, sehingga potensi kerusakan akibat gempa bumi sangat tinggi. Hasil penelitian ini dapat digunakan sebagai salah satu pertimbangan dalam pembuatan rencana tata ruang dan basic engineering design dengan penambahan survey lain yang lebih tinggi resolusinya.  Hal ini menjadi sangat penting mengingat wilayah Kelurahan Jempong Baru direncanakan menjadi tempat relokasi kantor Walikota Kota Mataram.
Microtremor based seismic vulnerability assessment of UIN mataram campus II, Lombok ilham, ilham; Sani, Muhammad Anwar
COMPTON: Jurnal Ilmiah Pendidikan Fisika Vol 12 No 1 (2025): Compton: Jurnal Ilmiah Pendidikan Fisika
Publisher : Prodi Pendidikan Fisika Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/cjipf.v12i1.19620

Abstract

The 2018 Lombok Earthquake caused extensive damage, severely impacting UIN Mataram. This study assesses the seismic vulnerability of the ground at UIN Mataram Campus II using the Horizontal-to-Vertical Spectral Ratio method applied to microtremor data. Measurements were conducted at 27 points with an approximate spacing of 100 meters. Each recording lasted 40 minutes, with a sampling rate of 100 Hz. Data were processed using Geopsy software to extract HVSR curves, with further analysis of reliability and clarity performed using MHVSR-Control, a Python-based GUI. The results reveal that the campus ground is characterized by a low fundamental frequency of 0.60 to 0.66 Hz and a high maximum amplification factor of 5.21 to 22.48, indicating a thick, soft sedimentary layer with high impedance contrast relative to the underlying bedrock. The seismic vulnerability index was extremely high, ranging from 44.5 to 815.08, with the highest values concentrated in the southern part of the campus. These values exceed the thresholds for structural damage, confirming that the UIN Mataram campus II is highly vulnerable to earthquake damage. These findings are critical for campus spatial planning, structural design, and disaster mitigation, supporting national strategies to enhance earthquake resilience.
Co-Authors muhammad Anwar Sani Muhammad Kafrawi Sismanto Sismanto Urip Nurwijayanto Prabowo Widodo Budhi