This is Arenal volcano, in Costa Rica. It is almost perpetually erupting at a relatively low rate. You can sort of get a sense for how small most strato volcanoes are - you could easily hike around the base of Arenal in a day. As you can see there are people living very near to this active volcano. Fortunately, at the moment most of the lava flows and small pyroclastic flows are going down the other side of the volcano, not the side with this town.
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