Elviana, Fidela Lathifah (2024) Analisis Bahaya Gempa Bumi Patahan Aktif Darat Kota Semarang Menggunakan Metode Deterministik. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Studi analisis bahaya kegempaan di Kota Semarang menggunakan metode deterministik yang akan menghasilkan nilai Peak Ground Acceleration (PGA) untuk setiap sesar aktif dalam radius 100 km dari Kota Semarang. Metode ini menghitung nilai PGA menggunakan fungsi atenuasi Chiou Youngs 2008 dan Boore Atkinson 2008. Selanjutnya digunakan data survei VS30 yang dilakukan BMKG dan parameter sesar aktif. Nilai PGA yang dihasilkan dari kedua fungsi atenuasi ini berbeda karena Chiou Youngs 2008 memperlihatkan efek dari jarak sumber patahan ke titik pengamatan. Sedangkan Boore Atkinson 2008 memperlihatkan site fungsi amplifikasinya. Nilai PGA setiap sesar mempunyai nilai terendah yaitu <0,05 g dan nilai tertinggi berkisar 0,4-0,5 g. Hasil analisa menunjukkan bahwa semakin jauh sumber sesar aktif dari Kota Semarang maka nilai PGA yang dihasilkan semakin kecil sehingga resiko terjadi gempa bumi kecil juga. Faktor nilai PGA lainnya dipengaruhi oleh kondisi geologi dan nilai VS30. Hasil nilai PGA berdasarkan potensi magnitudo, yaitu nilai PGA yang tinggi terjadi di Kota Semarang bagian selatan dan timur, meliputi KecamatanGunung Pati, Mijen, Tembalang, Banyumanik, Gajahmungkur, Candisari, Pedurungan, Semarang Tengah, Semarang Timur, Semarang Selatan, Gayamsari, Semarang Barat di bagian selatan, Mijen bagian timur, dan Ngaliyan bagian timur. Nilai PGA berada dikisaran 0,15-0,2 g. Hal ini menandakan sesar-sesar pada wilayah tersebut memiliki pengaruh dalam memberikan efek goncangan terhadap Kota Semarang. Hal tersebut berlaku sebaliknya jika PGA lebih rendah. Sedangkan nilai PGA yang lebih rendah berada dikisaran 0,10-0,15 g, terutama terdapat di Kota Semarang bagian utara dan barat, meliputi Kecamatan Tugu, Genuk, Semarang Utara, Mijen bagian barat, dan Ngaliyan bagian barat
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The seismic hazard analysis study in the city of Semarang uses a deterministic method which will produce Peak Ground Acceleration (PGA) values for each active fault within a radius of 100 km from the city of Semarang. This method calculates the PGA value using the attenuation function Chiou Youngs 2008 and Boore Atkinson 2008. Next, VS30 survey data conducted by BMKG and active fault parameters are used. The PGA values resulting from these two attenuation functions are different because Chiou Youngs 2008 displays the effect of the distance from the fault source to the observation point. Meanwhile, Boore Atkinson 2008 displays the site's amplification function. The PGA value for each fault has the lowest value, namely <0.05 g and the highest value ranges from 0.4-0.5 g. The analysis results show that the farther the active fault source is from the city of Semarang, the smaller the resulting PGA value, so the risk of an earthquake is also small. Other PGA value factors are influenced by geological conditions and the VS30 value. The results of the PGA value are based on the potential, namely high PGA values occur in the southern and eastern parts of Semarang City, including the Districts of Gunung Pati, Mijen, Tembalang, Banyumanik, Gajahmungkur, Candisari, Pedurungan, Central Semarang, East Semarang, South Semarang, Gayamsari, West Semarang in the southern part, Mijen in the east, and Ngaliyan in the east. The PGA value is in the range of 0.15-0.2 g. This indicates that the faults in this area have an influence in providing a shaking effect on the city of Semarang. The opposite applies if the PGA is lower. Meanwhile, lower PGA values are in the range of 0.1-0.15 g, mainly found in the northern and western parts of Semarang City, including Tugu, Genuk, North Semarang, Mijen in the west, and Ngaliyan in the west.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Active Fault, Deterministic, PGA, VS30, Deterministik, Sesar Aktif |
| Subjects: | Q Science > QE Geology > QE538.8 Earthquakes. Seismology Q Science > QE Geology > QE601 Geology, Structural |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis |
| Depositing User: | Fidela Lathifah elviana |
| Date Deposited: | 19 Aug 2024 07:41 |
| Last Modified: | 19 Aug 2024 07:41 |
| URI: | http://repository.its.ac.id/id/eprint/114491 |
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