This dataset is supplementary material to "Detection limits and near-field ground motions of fast and slow earthquakes" by G. Kwiatek and Y. Ben-Zion published in Journal of Geophysical Research - Solid Earth.The dataset contains spatial variations of ground motions (peak ground velocities) expected from various rupture scenarios of magnitude M6 earthquake that occurs in Southern California area, United States. The performed calculations of ground motions are based on synthetic velocity seismograms calculated with Discrete Wavenumber Method assuming crustal seismic velocities and attenuation properties in Southern California. The selected rupture scenarios include slow- and fast propagating ruptures (varying rupture velocity), crack- and pulse-type rupture type (varying rise time) and different rupture directivities (circular-to-unilateral, circular-to-bilateral ruptures are considered). The dataset allows to reproduce Figures 7-8 and S3-S4 from the original manuscript.