on the spatial correlation for vertical component of response spectral acceleration

Quantification of spatial correlation of ground motion intensity measures plays an important role in seismic risk assessment of lifeline networks. the variability of intensity measures for a single site has been studied during the last decades. however, the probabilistic nature of spatial correlation of intra-event intensity measures over a region has received less attention. the present study investigates the uncertainty of intra-event correlation of vertical spectral accelerations (sas) at structural periods between 0.0 and 3.0 s. the results show that the spatial correlation of intra-event of sas may vary earthquake-to-earthquake and is dependent on earthquake magnitude.