<jats:title>Abstract</jats:title> <jats:p>Repeatability is one of the most important factors for time-lapse seismic surveys. Several types of permanent seismic sources have been developed previously to improve repeatability but monitoring of deep targets is still challenging because of the small power of such sources. We operated an ACROSS (Accurately Controlled, Routinely Operated Signal System) permanent seismic source at the Aquistore CO2 storage field in Saskatchewan, Canada. This source is known to excite continuous highly repeatable seismic signals by rotating an eccentric mass and to generate large force that is comparable to Vibroseis. This study analysed the quality and repeatability of ACROSS data (before massive CO2 injection) acquired in 4 periods (December 2014, and March, June, and October of 2015). Target reflections from 3300m depth can be observed on the ACROSS shot gather. After stacking over several hours, the S/N ratio of a raw shot gather from ACROSS is found to be comparable with a Vibroseis gather. Although low frequency and high amplitude noise is not negligible at near offset, the quality and repeatability of far offset data are excellent as the time shift calculated by cross correlation between different data is basically less than 1 milisecond. Data in March show a few milisecond time shift on all traces which is presumably caused by near surface changes locally around ACROSS but a global matching filter successfully corrected the time shifts and reduces its median to 0.74 ms which is less than expected time shifts by a previous study. This study indicates the high potential of an ACROSS survey to detect small changes for deep targets.</jats:p>