Erta Alé is a shield volcano in Ethiopian Danakil-depression. Its summit rise just 612 m above the depression. In the Caldera are 2 pitcraters. In one of them a persistent lava lake is boiling. These pictures were made during my second expedition in this area in January 2008.
In Yellowstone National Park you can find the majority of the world’s geysers: Old Faithful, Castle, Grand and Steamboat are the most popular Geysers of Yellowstone. Other attractions are the hot springs and pools. Minerals and thermophilic algae and bacteria give the pools a colorful look. The origin of the hot water phenomena is a giant volcano. The Yellowstone volcano is a caldera volcano, which is known for its massive eruptions.
The National Park was founded in 1872 and was America’s first national park. The park prevents some of the largest populations of grizzly bears, wolves and herds of elk and bison.
I visited the Yellowstone two times: in 1991 and 2007. Here are the pictures of my last journey.
While the other volcanoes of Vanuatu are only sporadically active, the Yasur is permanently active for at least 800 years and has some similarities with the Stromboli in Italy. The activity of the small volcano is strombolian. Yasur erupts even at shorter intervals than Stromboli. On average, 500 explosions at Yasur can be registered per day. In the “wild” times the bursts tend towards volcanic type and can then be stronger by far than the regular eruptions of Stromboli. So it is the Yasur not rare that lava rocks fly up to the crater rim. In autumn 2008, two Asian tourists were killed during one of these eruptions. Their guide survived the disaster.
The 405-meter-high volcano is easily accessible. The cone was built in the caldera of an older volcano that collapsed after a major eruption. The special feature here is that the bottom of the caldera raises an average of 15 centimeters per year.