Measurement of Shear Strain to Map Liquefaction Area for Earthquake Mitigation in Bengkulu City
Muhammad Farid, Kuwat Triyana
Bengkulu city is well-known as a high-risk area for earthquake. When the earthquake occurs the soil will lose its strength and solidity, causing the buildings standing on top of it to collapse and sink into the ground. This phenomenon is known as liquefaction. One method to determine whether an area is at risk for liquefaction is by measuring the value of of that area. This method is expensive because the data must always be updated from the United States Geological Survey (USGS) database of for a certain area. Therefore, it is recommended that researchers produce their own data by drilling the soil to 30 meters depth. Yet, drilling the soil for that depth is quite expensive. Alternatively, a researcher may develop a better and cheaper method by determining the shear strain (γ) of each area of interest. Shear strain indicates the strength of soil layer materials to resist stretch or shifts when the earthquake happens. Shear strain values could be determined by measuring the seismic vulnerability index and the peak ground acceleration.