Seismic site characterization for Moulvibazar town, Bangladesh

Hossain, Md. Shakhawat; Kamal, A. S. M. Maksud; Siddiqua, Sumi; Mustahid, Fansab; Farazi, Atikul Haque

doi:10.1007/s10064-017-1031-6

Cited by 15 publications

(11 citation statements)

References 46 publications

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“…From the geomorphological point of view, this town is characterized by a landscape with Holocene flood plain, low elevated terrace, and sporadic hillocks [32]. As seismic hazard assessment and site characterization are still at nascent state in Bangladesh, it is no wonder that this rapidly growing town is still lacking investigation as per the risk assessment of ground failure by seismic soil liquefaction hazard.…”

Section: Geomorphology and Geologymentioning

confidence: 99%

“…1. The seismic zoning map of Bangladesh [8] delineated this town within the most vulnerable seismic hazard prone zone of Bangladesh, where the peak horizontal ground acceleration (PGA) value is assigned as 0.36 g. The subsurface soils of the town down to a depth of more than 20 m are composed of the Holo-Pleistocene and Holocene loose and soft sediments [32]. The epicenter of the 1918 Srimangal Earthquake (M w 7.6) was close to Moulvibazar town, and extensive liquefaction phenomena were observed in this region including the town area after this quake [42,43].…”

Section: Introductionmentioning

confidence: 99%

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Assessment of soil liquefaction potential: a case study for Moulvibazar town, Sylhet, Bangladesh

et al. 2020

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Liquefaction can intensify the destruction caused by an earthquake; thus, a region with high liquefaction potential could be more disastrous. Bangladesh is surrounded by the Indo-Burma Folded Belt in the east, the Dauki Fault and Himalayan Syntaxis in the north that are known to have occurred high magnitude earthquakes (e.g., M w > 7) in the past. Therefore, assessing seismic hazards in the regions that are economically growing fast is of great interest. Among many other hazard assessment parameters, soil liquefaction potential index (LPI) can be used to assess seismic hazards. In this study, we have assessed the seismic hazard potential for a small town (Moulvibazar) in the northeast Bangladesh documenting liquefaction potential indices for different surface geological units using an earthquake of moment magnitude M w 8 having a peak horizontal ground acceleration (PGA) of 0.36 g. Twenty-five standard penetration test (SPT) boreholes were completed within the study area to obtain SPT-N values for two surface geological units: (1) Holo-Pleistocene low elevated terrace deposits (Zone 1) and (2) Holocene flood plain deposits (Zone 2). Using the SPT-N values, the LPI values have been calculated for the soil profile of each borehole. The LPI values in the town vary from 0 to 42.33, whereas values from 1.42 to 7.52 are in Zone 1 and values from 0 to 42.34 are in Zone 2. It has been predicted that 42% and 78% areas of Zone 1 and Zone 2, respectively, might exhibit surface manifestation of liquefaction. The results of this study can be used for seismic risk management of Moulvibazar town.

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Section: Geomorphology and Geologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Assessment of soil liquefaction potential: a case study for Moulvibazar town, Sylhet, Bangladesh

et al. 2020

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“…The study area comprises a part of Chittagong hill tracts, which is geologically in the western margin of the Chittagong-Tripura folded belt (CTFB) and more precisely in the plunged zone of the Sitakund anticline (Islam et al, 2018). This Tertiary fold belt in the eastern margin of the Bengal basin-the basin itself is situated in the eastern periphery of the Indian plate-has come into existence because of intricate interaction among the Indian plate, the Eurasian plate, and Burmese platelet (Rahman et al, 2017;Farazi et al, 2018). Like all other anticlines of CTFB, Sitakund anticline also has NNW-SSE axial trend.…”

Section: Geology and Geomorphologymentioning

confidence: 99%

A Case Study Based Slope Stability Analysis at Chittagong City, Bangladesh

Farazi

Mia

Mahmud

2018

J. Geoscience Eng. Environ. Technol.

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Heavy rainfall occurs almost every year in Bangladesh and induces landslides in the hilly regions of this country. Among them the Chittagong City has the worst scenario―as there lives a dense population, extending from the plain lands to the hilly area. So, for risk mitigation and management in this landslide prone city, slope safety margin should be determined. From this context, this article presents factor of safety (FS) values in terms of landslide hazard at Chittagong city, based on geotechnical parameters and slope geometry. Thus a preliminary idea on the allowable stress for slope design could be made from this study. In total, 16 hazard sites of the 2007 and 2008, rainfall induced, landslides were examined as a case study along with subsequent collection of in situ soil samples of the failed slopes for geotechnical laboratory analysis. For FS calculation, the limit equilibrium method for infinite slopes was deployed along with the Cousins’ stability chart. FS values from 0.94 to 1.57 were found at the hazard sites. The results imply that FS value more than 1.57 should be used for slope safety margin. Moreover, from a probabilistic approach, the authors recommend FS > 1.80 as optimum value for the region. Furthermore, a relationship between slope height to slope length ratio, or slope angle and FS was established for this region for a quick calibration of FS value by simple on-field measurement of slope parameters. It is expected that this scenario based finding would contribute in mitigation of landslide hazard risk at the study area. Additionally, site specific FS values were presented in a map by color indexing. This research could ascertain the location wise slope strength requirement and be considered as a guideline for future calculation for slope safety design against rainfall triggered landslides in this city.

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“…For calibration of factor of safety against liquefaction (F L ), we used the updated Simplified Procedure of Youd et al [16], which was originally proposed by Seed and Idriss [3]. According to the deterministic procedure of Youd et al [14], factor of safety against liquefaction is defined as…”

Section: Methodsmentioning

confidence: 99%

“…Seismic soil liquefaction potential can be assessed from standard penetration test (SPT) N values, using the Simplified Procedure of Seed and Idriss [3]. Factor of safety, F L , against liquefaction can be determined through this method.…”

Section: Introductionmentioning

confidence: 99%

LPI Based Earthquake Induced Soil Liquefaction Susceptibility Assessment at Probashi Palli Abasan Project Area, Tongi, Gazipur, Bangladesh

2018

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This study aims at evaluation of seismic soil liquefaction hazard potential at Probashi Palli Abasan Project area of Tongi, Gazipur, exploiting standard penetration test (SPT) data of 15 boreholes, following Simplified Procedure. Liquefaction potential index (LPI) of each borehole was determined and then cumulative frequency distribution of clustered LPI values of each surface geology unit was determined assuming cumulative frequency at LPI = 5 as the threshold value for liquefaction initiation. By means of geotechnical investigation two surface geological units-Holocene flood plain deposits, and Pleistocene terrace deposits were identified in the study area. We predicted that 14% and 24% area of zones topped by Pleistocene terrace deposits and zones topped by Holocene flood plain deposits, respectively, would exhibit surface manifestation of liquefaction as a result of 7 magnitude earthquake. The engendered hazard map also depicts site specific liquefaction intensity through LPI values of respective boreholes, and color index, which was delineated by mapping with ArcGIS software. Very low to low, and low to high liquefaction potential, respectively, was found in the areas covered by Pleistocene terrace deposits and Holocene flood plain deposits. LPI values of both units are such that sand boils could be generated where LPI > 5.

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Seismic site characterization for Moulvibazar town, Bangladesh

Cited by 15 publications

References 46 publications

Assessment of soil liquefaction potential: a case study for Moulvibazar town, Sylhet, Bangladesh

Assessment of soil liquefaction potential: a case study for Moulvibazar town, Sylhet, Bangladesh

A Case Study Based Slope Stability Analysis at Chittagong City, Bangladesh

LPI Based Earthquake Induced Soil Liquefaction Susceptibility Assessment at Probashi Palli Abasan Project Area, Tongi, Gazipur, Bangladesh

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