QS-4 is an OSL-dated rockfall boulder from the slopes west of Qiryat Shemona, below the Ramim escarpment. The rockfall source was the 40 m high subvertical cliff of the Ein El Assad Formation, located about 350 m above the town.

Kanari et al. (2019) dated QS-4 by sampling soil or colluvium from directly beneath the boulder, constraining the time when the sediment was last exposed to sunlight prior to burial by the fallen block. QS-4 produced an age of 1.0 ± 0.1 ka, corresponding to a range of 900-1100 CE.

Kanari et al. (2019) correlate this age with the 1033/4 earthquakes, suggesting that QS-4 most likely represents a rockfall event triggered by this large historical earthquake.

Figure 10 - Summary of OSL ages (black circles with error bars) plotted in chronological order and selected historical earthquakes suggested as rockfall triggers (shown as vertical gray lines, chronologically labeled at the top axis); see text for details. - click on image to open in a new tab - Kanari et al (2019)