THE STUDY ON THE SEISMIC INTENSITY AND GROUND MOTION ATTENUATION RELATIONSHIP OF MODERATE EARTHQUAKE RISK ZONE

摘要

Earthquake ground motion attenuation relationship is the base of compiling seismic zoning map and evaluating seismic safety for engineering sites. Based on the seismic intensity data of the moderate earthquake risk zones in Central China, South China and Northeast China, the seismic intensity attenuation relationship of the moderate earthquake risk zones in China is obtained by regressive analysis. Then, taking the Western America where the ground motion records are abundant as reference region, the attenuation relationship is converted into the ground motion attenuation relationship of the moderate earthquake risk zones in China through the mapping conception. Compared with the attenuation rules in North China, the seismic intensity and peak ground motion acceleration of the moderate earthquake risk zones attenuate more slowly. For small earthquakes, when the distance to the epicenter is same, the seismic intensity and peak ground motion acceleration are larger than that of North China and the difference value decreases gradually as the earthquake magnitude increases.