Posts tagged: volcano
Volcano and Aurora in Iceland
Jeju Island Halla Mountain, Korea.
The crater on top of the extinct volcano pictured is the Sangumburi Crater. Although it did not spew much lava, the remaining crater is 328 feet (100 meters) deep and an average of 1,148 feet (350 meters) across. Over 400 species of plants and animals live inside of it. This is the only crater lake in South Korea. The largest island and smallest province in Korea, the island has a surface area of 1,846 km2.
The Biggest Bang of the 20th Century: The 1912 Eruption of Novarupta in Alaska
[June 6, 2012 marked] the 100th anniversary of the largest eruption of the 20th century, yet many people have never even heard its name. In fact, the name was wrong for almost half a century! What is known as the Novarupta or Katmai eruption of 1912 was huge – ejecting almost 30 cubic kilometers of ash and debris into the atmosphere or along the ground as pyroclastic flows. That represents ~13 cubic kilometers of magma (once you correct for all the air in ash) erupted over the course of ~60 hours. That is a rate of nearly 220 million cubic meters per hour, which is roughly 520 million tonnes per hour – or to put it another way, that is ~5,300 Nimitz-class aircraft carriers per hour. Now that is an eruption!
Read the blow-by-blow of the eruption here.
Despite being one of the most active volcanoes in Papua New Guinea, Bagana is poorly monitored. Located on the mountainous spine of Bouganville Island, it is both far from any cities or large towns and hard to reach due to the rough terrain. Bagana emits volcanic gases (including water vapor and sulfur dioxide) almost continuously, and frequently extrudes thick lava flows. Satellites provide the most reliable way to watch this activity.
This natural-color image reveals a fresh lava flow on Bagana’s eastern flank. The image was collected by the Advanced Land Imager (ALI) aboard the Earth Observing-1 (EO-1) satellite on May 16, 2012. Imagery from Landsat 7 shows that the flow was established some time between March 2011 and February 2012. The fresh lava is dark brown, while lighter brown areas were likely stripped of vegetation by volcanic debris or acidic gases. Older lava flows are covered in light green vegetation, and the surrounding forests are dark green. The volcanic plume and clouds are both white.
“Temporarily the moon is hidden behind a small but dense cloud of steam, while a particularly strong eruption occurs from NE cone.” Stromboli, Italy.
Pico Cão Grande
This landmark needle-shaped volcanic plug peak is located in the south of São Tomé Island in Obo National Park. It rises dramatically over 300 m (1,000 ft) above the surrounding terrain and the summit is 663 m (2,175 ft) above sea level.
How fucking rad is this?!
Rano Kau volcano in Rapa Nui National Park, Easter Island, Chile
Photograph by YANN ARTHUS BERTRAND