BackgroundYasur, the best-known and most frequently visited of the Vanuatu volcanoes, has been in more-or-less continuous strombolian and vulcanian activity since Captain Cook observed ash eruptions in 1774. This style of activity may have continued for the past 800 years. Yasur, located at the SE tip of Tanna Island, is a mostly unvegetated 361-m-high pyroclastic cone with a nearly circular, 400-m-wide summit crater. Yasur is largely contained within the small Yenkahe caldera and is the youngest of a group of Holocene volcanic centers constructed over the down-dropped NE flank of the Pleistocene Tukosmeru volcano. The Yenkahe horst is located within the Siwi ring fracture, a 4-km-wide, horseshoe-shaped caldera associated with eruption of the andesitic Siwi pyroclastic sequence. Active tectonism along the Yenkahe horst accompanying eruptions of Yasur has raised Port Resolution harbor more than 20 m during the past century.
(source: Global Volcansim Project)
The erupting crater of Yasur volcano under a moon- and starlit sky. The torch of a distant observer on the opposite rim looks like a second moon. (Photo: Tom Pfeiffer)
Powerful explosion from the southern vent of Yasur volcano in the evening twilight (Photo: Tom Pfeiffer)
Yasur volcano erupting under a moon-lit sky (Photo: Tom Pfeiffer)
The flat area around the eastern base of the cone of Yasur volcano is covered with thousands of large bombs from strong eruptions. (Photo: Tom Pfeiffer)
Yasur volcano tours:Volcanoes and Cultures - Adventures in the South Sea (15-day volcano and photo expedition to Ambrym and Yasur volcanoes, Vanuatu)Dream Come True - World Volcano Tour (4-week round-the-world trip to Hawaii - Vanuatu - New Zealand - Indonesia)
See also: Sentinel hub | Landsat 8 | NASA FIRMS