Volcanic regions in the Pacific Ocean:

Hawai'i

Volcanoes of Hawai'i (here a photo from a lava lake of Kilauea volcano)
Kilauea volcano
Mauna Loa

Vanuatu

Volcanoes of Vanuatu (on the photo: a lava lake inside Benbow crater, Ambrym volcano)
Ambrym
Yasur
Lopevi

Tonga & Fiji

Home Reef (Tonga Islands)

Philippines

Mayon
Bulusan
Canalaon

Papua New Guinea (PNG)

Volcanoes of PNG (here erupting Tarvurvur volcano, Rabaul)
Tavurvur (Rabaul caldera)
Manam
Langila
Ulawun
Ritter Island
Bagana
Pago