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Environmental Earth Sciences

, Volume 60, Issue 3, pp 643–653 | Cite as

Seismic hazard assessment for Mymensingh, Bangladesh

  • Jiban K. Sarker
  • Mehedi Ahmed Ansary
  • Md. S. Rahman
  • A. M. M. Safiullah
Original Article

Abstract

Mymensingh municipality lies in one of the most earthquake-prone areas of Bangladesh. The town was completely destroyed during the Great Indian Earthquake of 12 June 1897, for which the surface-wave magnitude was 8.1. In this study the 1897 Great Indian Earthquake was used as a scenario event for developing seismic microzonation maps for Mymensingh. For microzonation purposes SPT data from 87 boreholes were collected from different relevant organizations. To verify those data ten boreholes of depth up to 30 m were drilled. Intensity values obtained for different events were calibrated against attenuation laws to check applicability to the study area. Vibration characteristics at diverse points of the study area were estimated by employing the one-dimensional wave-propagation software SHAKE. SHAKE discretizes the soil profile into several layers and uses an iterative technique to represent the non-linear behavior of the soil by adjusting the material properties at each iteration step. The required input information includes depth, shear wave velocity, damping factor, and unit weight of each soil layer. The liquefaction resistance factor and the resulting liquefaction potential were estimated to quantify the severity of liquefaction. Quantification of secondary site effects and the weighting scheme for combining the various seismic hazards were heuristic, based on judgment and expert opinion.

Keywords

Liquefaction Microzonation Site amplification Seismic risk 

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Jiban K. Sarker
    • 1
  • Mehedi Ahmed Ansary
    • 1
  • Md. S. Rahman
    • 1
  • A. M. M. Safiullah
    • 1
  1. 1.Department of Civil EngineeringBUETDhakaBangladesh

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