#lava dome

[kramlabs]

. https://www.arimat.co.uk/blog/archival-rummaging-nike-lava-high-1988

Archival Rummaging: Nike Lava High (1988) — Arimat - Creative Studio & Blog

Delving into our personal footwear archive, we take a closer look at a pre-cursor to Nike’s heralded ACG line. Lets go outside!

[sitting-on-me-bum]

Sanbangsan Sunset

Sunset at Sanbangsan, a 395 meter (1,236 feet) high lava dome on the South Korean island of Jeju.

By Glenn Lewis

[8nightsperweek]

[walkinthehills]

The summit of Mt Chokai-san volcano (left) is on the lava dome that erupted in 1801.   鳥海山の外輪山（伏拝岳）より新山（山頂，左）と七高山（外輪山最高点，中奥） 赤い屋根は大物忌神社

[earthstory]

Shiveluch Shiveluch volcano is the northernmost active volcano in the Kamchatka Peninsula’s volcanic arc and one of the most active on that peninsula. In this photo pair from 2012, you can see most of its normal eruptive habit. Shiveluch is a horseshoe shaped volcano, with one open side created during a large collapse and debris avalanche several thousand years ago. In the center of that horseshoe, viscous andesitic magma wells up to the surface and forms a lava dome.

Lava domes form when viscous magma is pushed up but can’t get out of the way. The outer layers exposed to the air cool and solidify while the inside is still moving. This process can build up pressure that triggers explosive eruptions if gas can’t easily escape cooling magma, and it can also trigger large collapses and associated explosions if the lava dome becomes oversteepened. A collapsing lava dome is a nightmare for anyone nearby; blocks of solidified lava are mixed with still molten lava and race down to lower ground, forming a type of pyroclastic flow called a Block and Ash flow. Shiveluch has built up several lava domes over the past century, with occasional collapses as you see in these 2 photos. Most of the volcanoes of Kamchatka occur because the Pacific plate is subducting beneath the smaller Okhotsk plate, which is mostly hooked to the continent of Asia. At the northern tip of the subduction zone, the Ohkotsk plate meets the North American plate and the Aleutian Island trench, creating a complicated triple junction where the Pacific Plate is sinking beneath 2 different other plates. In the process, the subducted plate actually seems to be ripping into two pieces, in the process allowing hot mantle rocks to leak upwards through the tear. That extra heat feeds some of the most active volcanoes at the northern end of the Kamchatka arc, including Shiveluch. -JBB Image source: https://www.researchgate.net/publication/261706569_Arenal_Costa_Rica_Activity_and_seismicity_decrease_new_analysis_of_acid-rain/figures?lo=1 References: https://volcanohotspot.wordpress.com/2015/03/18/tectonics-of-the-kamchatka-peninsula/ http://www.eri.u-tokyo.ac.jp/people/ichihara/vp2009plan/DavailleLees2004.pdf

[fatchance]

Dome and cone.

At Sunset Crater Volcano National Monument, Coconino County, Arizona.

[creaturing]

Dome fountain of episode 10, October 10–13, 1969, eruption of Kilauea Volcano. This dome fountain is about 20 m (65 ft) high. Symmetrical dome fountains such as this are rare.

[gottalottarocks]

This lava dome was extruded on the flank of South Sister and it’s edifice is composed of huge blocks of rhyolitic obsidian. Lava domes only form from extrusions of highly silicic and viscous lavas that are essentially to sticky to flow so they build up as a dome.