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Mount Katmai (Russian: Катмай) is a large active stratovolcano (composite volcano) on the Alaska Peninsula in southern Alaska, located within Katmai National Park and Preserve. It is about 6.3 miles (10 km) in diameter with a central lake-filled caldera about two by three miles (3.2 by 4.8 km) in size, formed during the Novarupta eruption ...
The volcano erupted most recently in 1992, but there is still fumarolic activity at the base of Lava Point and there are hot springs North-East of the caldera. [1] In March 1996, an earthquake swarm was followed by deformation of the volcanic edifice, including a lowering of the eastern side and a rise of the western side of the volcano.
Quaternary Volcanoes of Japan - Geological Survey of Japan; Volcano on Google Map - Geological Survey of Japan; The National Catalogue of the Active Volcanoes in Japan - Japan Meteorological Agency; 日本の主な山岳標高 (Elevation of Principal Mountains in Japan) - Geospatial Information Authority of Japan (in Japanese)
In 2015, researchers found that the volcano's structure bore patterns of magnetic striping on either side, indicating that the volcano is likely a hybrid of a mid-ocean ridge and a shield volcano. Geologic data also indicated that Tamu Massif formed at the junction of three mid-ocean ridges, which was a highly unusual occurrence.
Then, they found a new volcano-like formation deep in the ocean waters. The new volcano-like structure sits more than 1,600 meters from the water's surface. So, it's far too deep to pose a danger ...
Many of Japan's typical examples of dinosaur fossils were found in this area. One of the major rock outcrops is in the Kuwashima area and is known as the "Kuwashima Fossil Wall" (桑島化石壁 Kuwashima Kasekikabe). Because the mountain is a dormant volcano, it is well known for its many onsen.
The volcano takes the form of a lava dome that was built above a ridge of a Tertiary mountain range near the Japanese coast. The volcano is one of the youngest in Japan, its age is estimated at only 3100 years old. The top of the lava dome is cut by fissures where mild phreatic eruptions have taken place in recent historical times.
Trident Volcano is an eroded volcanic complex on the Alaska Peninsula in Katmai National Park, Alaska. Up to 23 domes comprise the complex stratovolcano, with the greatest elevation of 6,115 feet (1,864 m). The most recent major activity produced a 3,599-foot (1,097 m) dome in an amphitheater on the southwest flank of the southwest peak.