Castlecrag is a very distinctive mountain from the Paradise Meadows/Forbidden Plateau area, and is a feature where the effects of the 1946 Vancouver Island earthquake are readily seen.
On June 23, 1946 a 7.3 magnitude quake centred in the Forbidden Plateau area on Vancouver Island shook houses off their foundations and toppled brick walls & chimneys in the Comox Valley & beyond. Luckily it was a Sunday otherwise many buildings would have been occupied & injuries would have occurred.
In Strathcona Park a well-known result of the earthquake is the rock slide off Mt. Colonel Foster which created Landslide Lake. Less well known perhaps is the change that occurred to Castlecrag Mountain.