In 2021, a deadly volcano erupted with no warning. Here’s why
New data suggest a region in Congo came close to an even deadlier catastrophe
![photo of Mount Nyiragongo erupting](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2022/09/090122_CG_Nyiragongo_feat.jpg?fit=1030%2C580&ssl=1)
Without the usual seismic warnings, Congo’s Mount Nyiragongo burst suddenly into life on May 22, 2021. The volcano spewed lava and smoke that threatened the nearby city of Goma.
Alex Miles/AFP/getty images plus