Nicely written, and you are correct, toba is indeed one of the largest supervolcano in the world eruption wise, being beaten only by yellowstone (probably). Samosir island is indeed growing, but as an Indonesian, as far as i know, the growth is quite slow so its still relatively safe for the people there and it's surrounding regions, hopefully it wont be active for a long-long time
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I lived atop the Valle Grande in New Mexico, a state in the US. It's a fairly big volcano that is also dormant. I had no worries it was going to go off. I suspect Toba has another 100,000 years before it blows its top again. There are far more active volcanoes in Indonesia to worry about than Toba.
Thank you for the compliment about the post.