Research on Rotational Components of Ground Motion in Wenchuan earthquake

Qifeng Luo, Zhong Hong and Chao He

This paper figures out the apparent wave velocity curves matching Sichuan area based on the records of Wenchuan earthquake, Ms8.0, in 2008, taking into account the frequency dispersion effects on the equivalent group wave speed of seismic wave and the incident angle of the body wave. And then the rotational components of ground motions in Sichuan area are studied, which are further used to discuss the attenuation characteristics and their power spectrum in the region.