Zusammenfassung der Ressource
Volcano
- Strcuture
- Cinder Cone
- Shield
- low viscosity
- Flat
- Hawaii
- stratovolcano (Composite volcanoes)
Anmerkungen:
- Pyroclastic and lava are not emitted during the same eruption.
Alternate between pyroclastic and lava flow.
- Eruption
- Effusive
- More Mafic
- Shield
- Low Viscosity
- Fountain(pressure is great)
- Explosive
- Coarse-grained Ash and Lapili
- Close volcano
- fine ash
- Away volcano
- types of Eruption
- 1.Fissure Eruption
- Crack in the ground
- basaltic lava with low viscosity
- 2.Hawaiian Eruption
- Large scale
- sustained flow
- gentle eruption with low viscosity lava
- 3.Strombolian Eruption
- short lived
- built up air
- more viscous and louder
- no more danger
- 4.Vulcanian Eruption
- cannon like explosion
- subdued(减弱的) eruption
- eruptive column reach 5-10km
- produce a small quantity of tephra
- 5.Plinian Eruption
- produced an eruption column like Vulanian
- sustained like Hawaiian
- felsic lava cools quickly and sold form like ash and pyroclastic debris
- a large quantities of tephra, pumice and ash
- Productions
- Lava Flow
Anmerkungen:
- 1. Viscosity divides the type of Lava Flow.
2. Silica controls viscosity
- Basaltic(Mafic) Flow
Anmerkungen:
- Silica- poor
less viscosity
- Pahoehoe
- a'a'
- Pillow
- Andesitic Flow
- Blokcy lava
- Rhyolitic (felsic) Flow
- Lava Dome
- Gas
- Pyroclastic Debris
Anmerkungen:
- 1.Rhyolitic eruption
2. gas rich
3.ash
- Blocks
- Bombs
- Lapili
- Pumice
- pyroclastic Flow
Anmerkungen:
- Plate tectonic