The alert level for several Vanuatu volcanoes has been raised to level three.
The Geohazards Department said this applied to the islands of Ambae and Ambrym where volcanoes are experiencing minor eruptions.
Warnings apply to Ambae's Manaro Voui volcano and Ambrym's Benbow and Marum volcanoes.
Volcanoes on Gaua, Tanna, Lopevi and Vanualava have also shown more activity.