Seismic vulnerability analysis in Poso Distric

Abstract

High seismic activity in Poso District is not supported by information related to earthquake hazard map with detailed scale. This information is very necessary for supporting the government’s efforts to reduce the risk of earthquake disasters. Therefore, this study aims to map earthquake-prone zones with detailed scale. The study was conducted by measuring Vs30 using a microtremor on each rock sample using the HVSR method, then these values were used as a reference in correcting the USGS Vs30 data, thus producing a VS30 distribution value, with an interval of 1 km. From the results of the study, it showed that based on the Vs30 ratio in Poso District, it obtained a ratio value > 0.5. This value indicates the difference between the results of microtremor measurements and USGS data which was not different significantly. However, some point showed different values to produce a classification of different types of material, thus affecting the distribution of seismic vulnerability. The results of seismic distribution analysis showed that middle lore has a high level of seismic vulnerability from 19 districts spread across Poso Regency