Analysis ground shear strain in Waai Village Ambon Island based on microtremor measurement

Abstract

Ground Shear Strain (GSS) research was conducted in Waai Village, Ambon Island based on microtremor measurements. The purpose of this research is to see the phenomenon of ground motion arising from the value of ground shear strain due to the earthquake. The large number of buildings that do not have earthquake-resistant construction and quality useless building materials are the main causes of building damage due to the devastating earthquake. The results of microtremor analysis showed that the values of Ag and fg were obtained for each measurement point. The value of the seismic vulnerability index, Kg in Waai Village ranges from 0.26 to 1.24 s2/cm. The lowest seismic vulnerability index value was at location 6 of 0.26 s2/cm, while the highest seismic vulnerability index value was at location 7 of 1.24 s2/cm. The value of the Peak Ground Acceleration (PGA), ag ranges from 245.79 to 659.55 gal. For the highest maximum PGA value is at location 4 of 659.55 gal and the lowest is at location 7 of 245.79 gal. The lowest value of the GSS, γ in Waai Village is at location 6 of 0.000151 and the highest is at location 4 of 0.0007. The phenomenon of the Ground Shear Strain value, γ in Waai Village, Ambon Island is building cracks and land subsidence.