as an unprecedented event. the incident back in 2014. but that was an above-ground flow. this is under ground. by the way, that steam you see there is not what you want to be breathing in. sulphur dioxide in there. and that can take hold in just a few minutes. like inhaling ammonia if that's ever happened to you by accident. similar conditions and you just run out of breath. your lungs get irritated. look at all the activity. this is a swarm of earthquakes. upwards of 500 earthquakes have been occurring across the eastern part of the big island as a result of the volcano. about 2 1/2 to 3 magnitude and then the big ones as well on thursday. 5.0 and a 6.9 friday. that was the strongest earthquake they've had since 1975 in hawaii. additional quakes will continue over the next several days. back to volcanology school. there's the magma at the earth's