Sorry but the molecular genetic data points to our common ancestry as being about 100,000 years ago at least. There is no geographic record of any such catastrophe that would depopulate Africa during the last 100,000 years, and the genetic data would show that genetic diversity increased out from Mt.Ararat, not from out of Africa.
Blam might post something.
The Mount Toba eruption was thought to be a partial cause of the human genetic bottleneck, potentially reducing the human population to 2-10K individuals. And the human population that had migrated up to nearly Turkey went extinct, though those that made it to India/Australian coasts probably survived.
“100,000 years ago at least”
Historical ‘Science’, not Observational Science