Several kinds of intensity measures (IM) can be defined from orthogonal horizontal components of seismic waveforms; they are maximum values of each component (NS, EW), geometric mean (GM), larger value (Larger), rotation-independent measures such as maximum (rot100) and median (rot50) obtained by axial rotation. In this study, mutual relationships among such IM’s were probabilistically evaluated. Using accelerograms recorded by K-NET, the distributions of each IM normalized to corresponding rot50 were represented by kernel density. The ratio of NS and EW to rot50 were newly derived as uniform-Rayleigh compound distribution, and on this basis, those for GM and Larger were derived. Bilinear model was adopted for rot100. Period-dependent distributions for each IM were also derived for absolute acceleration, velocity and displacement response waveforms of SDOF with 5% damping.