Research on lethal levels of buildings based on historical seismic data

Due to the influences of buildings, geographical and geomorphological environments, road conditions, etc., probabilities numbers casualties in different areas after an earthquake are different. Accordingly, we propose concept lethal level, which attains grades representing mortality rate differing intensities. Different regions have unique levels, regional levels affected mainly by proportion each building type corresponding as types buildings also levels. Based on data 52 historical disasters, constructed a level calculation model obtained type. The results reveal that ranges fixed unequal; moreover, overlap other. range adobe structures is 0.85–1, civil 0.75–0.95, brick-wood 0.6–0.9, brick-concrete 0.33–0.6, wood 0.2–0.35, reinforced concrete 0.1–0.25. these types, overall region can be quantified graded, this classification does not depend location or administrative boundaries. In pre-earthquake evaluation efforts, area derived through field research. After earthquake, number quickly assessed based intensity area. This approach further provide scientific support for risk zoning assessment