On July 20

2012

M4.9 earthquake occurred near the boundary of Gaoyou and Baoying

Jiangsu Province.The focal depth is about 5 km.It is the biggest earthquake in Jiangsu since 1990.To study the earthquake qualitatively and quantificationally

empirical relationships are employed to estimate the length

width and area of the rupture plane

and related rise time

slippage and stress drop.Then

the seismic intensities based on empirical PGA and intensity attenuation relationships are computed respectively.The distribution characteristics and the difference between the results are analyzed

and potential influence factors are discussed.At last

the strong motion records from M4.9 Gilroy earthquake are used to describe the possible variability of PGA and response spectrum.The effect of site condition is discussed.The results could provide a better understanding of Yangzhou earthquake

for its shortage of strong motion records.