Mystery solved, lightening ⛈️! So weird, if we didn't see the lightning honestly it was such a weird sound, never heard thunder like that (and I lived in Alberta for 30 years)

Thank you very much John! It must have been a quarry blast or something along those lines.

Hope you are having a great fall with your garden 🍂

The Port Clements seismogram station is not viewable. I wonder if it picked up anything @earthquakeguy.bsky.social 🧐

Fascinating!