Migration After Toba
It is currently not known where human populations were living at the time of the eruption. The most plausible scenario is that all the survivors were populations living in Africa, whose descendants would go on to populate the world. However, recent archeological finds, mentioned above, have suggested that a human population may have survived in Jwalapuram, Southern India.
Recent analyses of mitochondrial DNA have set the estimate for the major migration from Africa from 60,000–70,000 years ago, around 10–20,000 years earlier than previously thought, and in line with dating of the Toba eruption to around 66,000–76,000 years ago. During the subsequent tens of thousands of years, the descendants of these migrants populated Australia, East Asia, Europe, and the Americas.
It has been suggested that nearby hominid populations, such as Homo erectus soloensis on Java, and Homo floresiensis on Flores, survived because they were upwind of Toba.
Read more about this topic: Toba Catastrophe Theory