ShakeMap of peak ground acceleration for 2014 Ludian, Yunnan, M_S6.5 earthquake

Considering the geological structure background, focal mechanism solutions, aftershock distribution and attenuation characteristics of the ground motion in western China, ShakeMap of peak ground acceleration (PGA) for the Ludian, Yunnan, M_S6.5 earthquake on 3 August 2014 was acquired, in which the method of rapid generation ShakeMaps considering site effects was used, and the PGAs of 62 strong motion stations for this earthquake were used as interpolation. Then, distribution of PGA was amended by using PGA observations to correct system bias of theoretical estimates in the area without PGA observations. The results show that the attenuation of ground motion with distance for the Ludian M_S6.5 earthquake was faster than that from previous studies on western China. The result by correction for bias in logarithmic regression was more consistent with attenuation law for this earthquake. The area with corrected PGA greater than 40 cm/s² was nearly 8000 km², which was reduced by about 40% compared with that of uncorrected.