QS-1 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-1 by sampling soil or colluvium from directly beneath the boulder. This OSL sample constrains the time when the sediment was last exposed to sunlight before being buried by the fallen block. QS-1 produced an age of 8.7 ± 1.0 ka (7700–5700 BCE).

Kanari et al. (2019) suggest that QS-1 may correlate with a paleoseismic event from the Kazzab Trench on the Yammunneh fault in Lebanon about 50 km north of the Qiryat Shemona study area. Events S9 and S10 from the Kazzab Trench are both plausible candidates.

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)