Abstract
A research using microseismic method had been conducted in Trangkil Sejahtera area, Semarang. Microseismic is an effective method to determine the ground shear strain value of a region. This study aimed to determine a landslide prone area within Trangkil Sejahtera, Semarang. Microseismic measurements was performed in an area of 200 × 400 metres with 9 points of measurements. Acquired data from the measurements was then analysed using HVSR (Horizontal to Vertical Spectrum Ratio) method, obtained the natural frequency value between 1.38-7.07 Hz, amplification between 1.42-3.28, thickness of weathering layer between 17.02-95.53 metres and ground shear strain value between 0.00083–0.00203. Those values were then mapped using Surfer to depict the distribution. Furthermore, by integrating the natural frequency value, amplification, Kg, PGA and GSS, it could be known that the landslide prone area is in the northern area of Trangkil Sejahtera.
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