Satellite data identifies warning signs ahead of 2018 volcanic eruption, tsunami

In 2018, the side of the Anak Krakatau volcano collapsed in a powerful eruption and produced a tsunami that killed hundreds and injured thousands on nearby Java and Sumatra in Indonesia. A new analysis of satellite data, led by researchers at Penn State, showed the mountainside was slipping for years and accelerated before the eruption — information that could have potentially offered a warning of the collapse.