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Lecture 5

Lecture 5 In Class Notes

4 Pages
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Department
Environmental Science
Course Code
EESA06H3
Professor
Nick Eyles

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Rheology: the ability to flow, how easy it is for something to flow
Pyroclastic (broken by fire): these are rocks that are shattered by the
power of the eruption and blown into the sky, either as volcanic bombs
or as ash
The deepest earthquakes that occur are about 700km down, this shows
that the descending slabs of oceanic crust are preserved until they reach
that depth
Magmatic arc: is a line of volcanoes directly above a subduction zone,
the oceanic crust is made of basalt, but when we drag down a lot of sea
water and sediments from the ocean, then when it is melted, a silicic
magma is created thus reducing the viscosity of the magma
Deep water trenches: is where the ocean floor is just starting to go
down into the subduction zone
New Zealand is the tip of a much larger landmass called Zealandia
The small triangles on the continental boundary lines on the maps
indicate the direction of subduction
Obduction: when continental crusts are pushing against each other
like the Himalayans
When two oceanic crusts collide, the older one subducts underneath as
the new crust is warmer, thus lighter
The Southern Alps are the place in New Zealand where there is a lot of
uplift due to the plates colliding, Mt. Cook is the highest point in New
Zealand
Lateral Blast: is where a volcano erupts to the side due to a sector
collapse of the rim
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Description
Rheology: the ability to flow, how easy it is for something to flow Pyroclastic (broken by fire): these are rocks that are shattered by the power of the eruption and blown into the sky, either as volcanic bombs or as ash The deepest earthquakes that occur are about 700km down, this shows that the descending slabs of oceanic crust are preserved until they reach that depth Magmatic arc: is a line of volcanoes directly above a subduction zone, the oceanic crust is made of basalt, but when we drag down a lot of sea water and sediments from the ocean, then when it is melted, a silicic magma is created thus reducing the viscosity of the magma Deep water trenches: is where the ocean floor is just starting to go down into the subduction zone New Zealand is the tip of a much larger landmass called Zealandia The small triangles on the continental boundary lines on the maps indicate the direction of subduction Obduction: when continental crusts are pushing against each other like the Himalayans When two oceanic crusts collide, the older one subducts underneath as the new crust is warmer, thus lighter The Southern Alps are the place in New Zealand where there is a lot of uplift due to the plates colliding, Mt. Cook is the highest point in New Zealand Lateral Blast: is where a volcano erupts to the side due to a sector collapse of the rim www.notesolution.com
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