Analisis Percepatan Tanah Maksimum dan Intensitas Gempa Bumi di Wilayah Cianjur, Jawa Barat, berdasarkan Gempa Bumi Cianjur, 21 November 2022

Pondry, Amira Khairunisa (2024) Analisis Percepatan Tanah Maksimum dan Intensitas Gempa Bumi di Wilayah Cianjur, Jawa Barat, berdasarkan Gempa Bumi Cianjur, 21 November 2022. Other thesis, Insittut Teknologi Sepuluh Nopember.

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Abstract

Gempa bumi dengan magnitudo 5,6 M mengguncang wilayah Cianjur, Jawa Barat, pada Selasa, 21 November 2022. Hingga bulan Februari 2023, terjadi lebih dari 500 kali gempa susulan dengan magnitudo yang bervariasi. Pada penelitian ini dilakukan analisis percepatan tanah maksimum dan intensitas gempa bumi untuk wilayah Cianjur, Jawa Barat, dengan tujuan untuk mengetahui nilai PGA di wilayah Cianjur sehingga dapat diketahui tingkat intensitas gempa bumi berdasarkan skala MMI. Perhitungan nilai PGA dilakukan dengan pendekatan empiris Esteva (1974) dan Campbell (1981), serta intensitas gempa bumi dihitung berdasarkan nilai PGA. Berdasarkan metode Esteva, nilai PGA berkisar antara 7,14 - 35,19 gal dengan intensitas gempa bumi IV-V. Berdasarkan metode Campbell, diperoleh nilai PGA sebesar 4,08 - 61,97 gal dengan intensitas gempa bumi IV-VI. Nilai PGA yang dihitung berdasarkan persamaan empiris dibandingkan dengan nilai PGA observasi yang didapat dari rekaman akselerograf gempa bumi 21 November 2022 dengan hasil RMSE sebesar 54% untuk metode Esteva dan 52% untuk metode Campbell. Nilai RMSE yang besar disebabkan dari adanya peningkatan signifikan pada data PGA observasi yang dipengaruhi efek near source dan efek geologi lokal. Secara keseluruhan, metode empiris Esteva dan Campbell cukup menggambarkan persebaran nilai PGA di wilayah Cianjur, namun penggunaan metode empiris tidak dapat menangkap detail lokal secara langsung di lokasi penelitian yang dapat mempengaruhi nilai PGA. Hal ini karena kedua model empiris ini hanya mempertimbangkan jarak hiposenter dan magnitudo dalam menghitung PGA tanpa mempertimbangkan faktor lokal seperti amplifikasi tanah, struktur lapisan tanah kondisi geologi lokal, dan sebagainya.
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An earthquake with a magnitude of 5.6 M occurred in the Cianjur area, West Java, on November 21, 2022. Until February 2023, more than 500 aftershocks with varied magnitudes were recorded. This research presents an earthquake analysis based on Peak Ground Acceleration (PGA) values and earthquake intensity for the Cianjur area, with the purpose of determining the PGA value and earthquake intensity based on the MMI scale. PGA value was calculated using the empirical equations of Esteva (1974) and Campbell (1981), and the earthquake intensity was calculated based on the PGA value. The PGA value for the Cianjur region ranges between 7.14 - 35.19 gal with an earthquake intensity of IV-V based on the Esteva method, while using the Campbell method the PGA value is 4.08 - 61.97 gal with an earthquake intensity of IV-VI. Predicted PGA value based on the empirical equation was compared with the observed PGA from the accelerograph recording of the 21 November 2022 earthquake, with RMSE of 54% for Esteva’s and 52% for Campbell’s. The large RMSE value is caused by a significant increase in observed PGA data which affects near source effects and local geological effects. Overall, Esteva and Campbell's empirical method reasonably describes the distribution of PGA values in the Cianjur area. Overall, Esteva and Campbell's empirical method reasonably describes the distribution of PGA values in the Cianjur area, however the use of empirical methods cannot capture local details directly at the research location which can influence PGA values. This is because these two empirical models only consider hypocenter distance and magnitude in PGA calculations without considering local factors such as soil amplification, soil layer structure, local geological conditions, and so on.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	akselerograf, accelerograph, earthquake, gempa bumi, intensitas, intensity, peak ground acceleration, percepatan tanah maksimum.
Subjects:	Q Science Q Science > QC Physics Q Science > QE Geology > QE538.8 Earthquakes. Seismology
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45201-(S1) Undergraduate Thesis
Depositing User:	Amira Khairunisa Pondry
Date Deposited:	31 Jul 2024 01:00
Last Modified:	31 Jul 2024 01:00
URI:	http://repository.its.ac.id/id/eprint/110097

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