DEVELOPMENT OF LIQUEFACTION HAZARD MAP FOR DINAJPUR MUNICIPALITY, BANGLADESH
DOI:
https://doi.org/10.33736/jcest.7382.2026Keywords:
SPT data, liquefaction, geospatial technique, kriging, hazard mapAbstract
The word "earthquake" now denotes a global catastrophic natural event. Dinajpur Municipality is the most susceptible place to earthquake-induced liquefaction due to its geographical location. A crucial component of characterising a geotechnical site is determining the liquefaction resistance of loose saturated sand. The article employs a simplified approach reliant on the Standard Penetration Test's blow count (SPT-N) to evaluate the liquefaction risk triggered by the earthquake in Dinajpur Municipality. SPT data was collected at 78 sites within the study area. The potential risk of liquefaction was assessed at each site for several earthquake magnitudes, including 6, 6.5, 7, 7.5, 8, and 8.5, with a peak horizontal ground acceleration (PGA) of 0.20 g. The liquefaction risk was assessed using an estimated liquefaction potential index (LPI) for each location. The LPI values in the examined region varied from 8.6 to 15.9 for earthquakes of magnitude 8.5, indicating a risk level from moderate to extremely high. The LPI of locations was subsequently utilised to generate a risk map using geospatial approaches. The LPI was determined to be negligible in the middle and central-southern regions of the study area. The liquefaction susceptibility has been assessed as being significant in the northern and southwestern regions of the study sites. These results may be used to improve the subsurface conditions in the study area for the development of earthquake-resistant structures. The created risk map may serve as a significant signal for the Bangladesh government's catastrophe mitigation strategy.
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