Kilauea
Kilauea er en skjoldvulkan på The big Island på Hawaii i stillehavet. Den er en af verdens mest aktive vulkaner, er mellem 300.000 til 600.000 år gammel og var i stort set kontinuerligt udbrud fra 1983 til 2018. Døgnet rundt holder sikkerhedsvagter øje med vulkanen for at kunne advare befolkningen, hvis der kommer lava flydende mod den nærliggende by. Vulkanens top befinder sig 1.247 m over havets overflade, men hæver sig kun omkring 15 m over det umiddelbart omgivende terræn.
Lavastrømme
I 2016 sank et stort lavadelta dannet af Kilauea i vandet og åbnede ind til en lavatunnel der sendte flydende lava direkte i havet.[1]
Eksterne henvisninger
- Hawai‘i Volcanoes National Parks officielle hjemmeside
- Hawaiian Volcano Obervatorys hjemmeside Arkiveret 1. marts 2013 hos Wayback Machine
Noter
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USA Flag Map.svg
(c) Lokal_Profil, CC BY-SA 2.5
Map showing Mainland USA ("lower 48") with a superimposed US flag.
(c) Lokal_Profil, CC BY-SA 2.5
Map showing Mainland USA ("lower 48") with a superimposed US flag.
Aa large.jpg
Glowing `a`a lava flow front advancing over pahoehoe lava on the coastal plain of Kilauea Volcano, Hawaii. 'A'a (pronounced "ah-ah") is a Hawaiian term for lava flows that have a rough rubbly surface composed of broken lava blocks called clinkers. The incredibly spiny surface of a solidified 'a'a flow makes walking very difficult and slow. The clinkery surface actually covers a massive dense core, which is the most active part of the flow. As pasty lava in the core travels downslope, the clinkers are carried along at the surface. At the leading edge of an 'a'a flow, however, these cooled fragments tumble down the steep front and are buried by the advancing flow. This produces a layer of lava fragments both at the bottom and top of an 'a'a flow.
Glowing `a`a lava flow front advancing over pahoehoe lava on the coastal plain of Kilauea Volcano, Hawaii. 'A'a (pronounced "ah-ah") is a Hawaiian term for lava flows that have a rough rubbly surface composed of broken lava blocks called clinkers. The incredibly spiny surface of a solidified 'a'a flow makes walking very difficult and slow. The clinkery surface actually covers a massive dense core, which is the most active part of the flow. As pasty lava in the core travels downslope, the clinkers are carried along at the surface. At the leading edge of an 'a'a flow, however, these cooled fragments tumble down the steep front and are buried by the advancing flow. This produces a layer of lava fragments both at the bottom and top of an 'a'a flow.