Mount Semeru erupted on Wednesday with pyroclastic flows and seismic tremors. Authorities maintain a Level III Alert.

After an eruption, DIY cushions of gas help searing torrents of gas, ash, and rock spread miles from their source within a matter of minutes. Pyroclastic flows contain a deadly combination of hot rock ...

The eruption of Mount Vesuvius produced such a hot ash cloud that it turned victims' brains into glass, according to a new study. Researchers have unearthed a piece of dark-coloured organic glass ...