Average measurements of SO2 from Kilauea summit in the past month
![](https://volcanoes.usgs.gov/vsc/captures/kilauea/SUMDFW-1mo-SO2.png)
Detailed Description
Sulfur dioxide (SO2) emission rates measured using an upward-looking ultraviolet spectrometer. These data are collected by traversing the gas plume in a vehicle or helicopter, downwind of Halema‘uma‘u, generally within and/or southwest of Kīlauea caldera. Results from multiple traverses during a day are averaged to yield the emission rates shown here. Successful measurements depend on wind, weather, and staff availability. Values are preliminary and are subject to revision.
Sources/Usage
Public Domain.