Analisis Seismisitas Berdasarkan Data Gempa Bumi Periode 1958-2018 Menggunakan b-Value Pada Daerah Selatan Jawa Barat dan Banten

Ilman Luthfi Hilmi, Sutrisno Sutrisno, Dede Sunarya

Abstract


The area of West Java and Banten, especially is Southern is one of the areas prone to earthquakes, caused by the fact that the area is part of the ring of fire path and the presence of faults that are still active faults, such as the Cimandiri Fault, the Baribis Fault and the Lembang Fault. The purpose of this study is to determine the level of seismic activity, the fragility of the rocks and the level of the return period to make earthquake resistant buildings. The seismotechnical parameters of a region can be calculated using the Frequency-Magnitude relationship with the Guttenberg-Rithcher formulation, namely  by using the Maximum Likelihood method. Based on the results of the research obtained from the combined data of USGS and BMKG, the magnitude of the 4 SR and the depths of 0-300 km. Based on the analysis and distribution of seismicity, it was found that the higher of the frequency the smaller earthquake magnitude is obtained. The results of the seismotechnical parameters provide variations of the b-value in South West Java and Banten around 0.95-1.45, with the highest value in the South of Pandeglang Regency (1.35-1.45) and the lowest in Tasikmalaya District (0.95-1.05). Variations of the a-values of an area around 6.5-9, while the highest value is in the South of Pandeglang Regency (8.5-9) and the lowest in Tasikmalaya Regency (6.5-7). The Seismicity Index is 0.632 and the Seismicity of the largest earthquakes is 0.004. Probability is at a time interval of 20 years with value as follows P (7.20) = 8%; P (7.40) = 15%; P (7.60); 21%. While variation of the return period are with variations of 5 SR = 1-4 years, 6 SR = 15-55 years and 7 SR = 150-550 years


Keywords


Condition of the South West and Banten regions, Guttenberg-Richter, Maximum Likelihood, Seismotechnical Parameters.

Full Text:

DOWNLOAD PDF

References


A. Fulki, Analisis Parameter Gempa, b-Value, PGA di Daerah Papua, Tangerang Selatan: Skripsi Fakultas Sains dan Teknologi UIN Syarif Hidayatullah Jakarta, 2011.

T. Zera, Geologi: Langkah Awal Mengenal Bumi, Jakarta: Program Studi Fisika UIN Syarif Hidayatullah Jakarta, 2007.

S. Syafriani, “IOP Conference Series: Materials Science and Engineering 335,” An Investigation of Seismicity for the West Sumatera Region Indonesia, p. 2, 2018.

S. Rohadi, H. Grandis and M. A. Ratag, "Studi Variasi Spasial Seismisitas Zona Subduksi Jawa," Jurnal Meteorologi dan Geofisika, Vol.8 No. 1, pp. 42-47, Juli 2007.

E. A. Suwandi, I. L. Sari and W. , "Wahana Fisika, 2(2)," Analisis Percepatan Tanah Maksimum, Intensitas Maksimum dan Periode Ulang Gempa untuk Menentukan Tingkat Kerentanan Seismik di Jawa Barat (Periode Data Gempa Tahun 1974-2016), pp. 12-30, 2017.

W. Pawirodikromo, Seismologi Teknik dan Rekayasa Kegempaan, Yogyakarta: Pustaka Pelajar, 2012.

K. Mogi, "Magnitude-Frequency Relationship for Elastic Shocks Accompanying Fractures of Various Materials and Some Related Problems in Earthquakes," Bull. Earthquake Res. Inst., 1962.

B. Sunardi, M. U. Istikomah and S. , "Jurnal Riset Geofisika Indonesia," Analisis Seismoteknik dan Periode Ulang Gempabumi Wilayah Nusa Tenggara Barat, Tahun 1973-2015, pp. 23-28, 2017.




DOI: https://doi.org/10.15408/fiziya.v2i1.10482

DOI (DOWNLOAD PDF): https://doi.org/10.15408/fiziya.v2i1.10482.g5850 Abstract - 0 DOWNLOAD PDF - 0

Refbacks

  • There are currently no refbacks.


Web Analytics Made Easy - StatCounter View My Stats

Flag Counter

License

© Copyright CC BY-SA