Yes, indeed. The explosion of Krakatoa was the loudest sound ever heard by mankind, ten miles around everybody would have been deafened, had the volcano not been at sea. Still, the boom was audible as far away as Perth, on the west coast of Australia.
And the Tambora explosion emitted about ten cubic miles of matter into the athmosphere, which caused the weather anomaly which is known as the „year without summer“. Crops failed all over the world, and a staggering number of human beings starved to death.
The earth it does things!
Approximately 1900 statute miles, essentially all over open ocean. Gargle Earth shows no land elevation above 300ft between, and very little of that. 1900 miles in the other direction covers most of modern Thailand, Laos, Cambodia, Vietnam, also Borneo and the Philippines. More land in the way, though. That's a lot of people who could have heard it.