Seismic Microzonation and Probability of Ground Failure Assessment Caused by liquefaction for Bogura District, Bangladesh

Hossain, Md. Belal; Rahman, Md Mahabub

doi:10.22075/jrce.2024.34111.2086

	Seismic Microzonation and Probability of Ground Failure Assessment Caused by liquefaction for Bogura District, Bangladesh
Journal of Rehabilitation in Civil Engineering
مقاله 12، دوره 13، شماره 2 - شماره پیاپی 38، تابستان 2025، صفحه 218-242 اصل مقاله (1.83 M)
نوع مقاله: Regular Paper
شناسه دیجیتال (DOI): 10.22075/jrce.2024.34111.2086
نویسندگان
Md. Belal Hossain¹؛ Md Mahabub Rahman^* ²
¹Associate Professor, Department of Civil Engineering, Hajee Mohammad Danesh Science and Technology University, Bangladesh
²Lecturer, Department of Civil Engineering, Hajee Mohammad Danesh Science and Technology University, Bangladesh
چکیده
The aim of this study is to create a Mercalli intensity map and evaluate the ground failure probability caused by liquefaction in the Bogura district. To generate a Mercalli intensity seismic microzonation map, first the shear wave velocity (Vs) was determined by analyzing data from 345 soil test reports. The conversion of Vs to site amplification factor (AF) and Peak Ground Acceleration (PGA) was carried out using the widely used empirical equations, considering earthquake magnitudes 1850–2023. Finally, the susceptibility of liquefaction was evaluated for the study area using 345 borehole data, considering a probable earthquake magnitude and site-specific PGA. Some of the frequently used empirical methods are utilized for the evaluation, and the results are presented in the form of hazard maps indicating factors of safety, liquefaction potential, and ground failure probability. The results demonstrate that the least and maximum PGA are both 0.06 g and 0.16 g, while the AF ranges from 1.903 to 3.98 between the minimum and maximum. Moreover, the surface acceleration (SA) varies between 0.143 g and 0.51 g. Based on the Mercalli Intensity seismic microzonation map, 22.45% of the areas have intensity VII, 72.9% of the regions have intensity VIII, and 4.65% of the areas have intensity IX. The hazard map reveals that 2% of the study region is judged to be at extremely high risk for ground failure due to liquefaction during the scenario earthquake. Additionally, it was determined that 13% and 44% of the study region's regions were at high or moderate risk of ground failure under the aforementioned earthquake scenario. The intensity and hazard maps created for Bogura district are crucial to achieving sustainable development goals.
تازه های تحقیق
The least and maximum Peak Ground Acceleration are both 0.06 g and 0.16 g, while the Amplification Factors range from 1.903 to 3.98 between the minimum and maximum. The surface acceleration varies between 0.143 g and 0.51 g. According to Modified Mercalli Intensity map, 45% areas intensity is VII, 72.9% of the regions with MMI VIII. For Mw = 6.5, about 55.12% of the study region's factor of safety is less than 1.2, indicating liquefaction risks. LPI analysis shows that 53% of the sample territory is situated in a high liquefaction hazard area. Ground failure probability analysis shows that 13% and 44% of the area within the study region are categorized as being at high and moderate risk of ground failure.
کلیدواژه‌ها
Seismic zonation؛ Ground failure probability؛ SPT data؛ Bogura؛ Hazard map
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