Guessing this was the event?
The blast was estimated at about 2.9 kilotons. Here's an idea on the reach of the blast if it were a nuclear detonation.»nuclearsecrecy.com/nukemap/?lat=···4&kt=2.9Back then however, they didn't have as many concrete buildings. Most of the buildings were made of wood and brick. The effects of the blast must have been much farther.Here's a clip from the Halifax explosion inspired drama: Shattered City.
The community of Richmond was completely devastated and is now the area known as "hydrastone"...»www.hydrostonemarket.ca/