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EESA06H3 (610)
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Lecture

Lecture 5

7 Pages
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Department
Environmental Science
Course Code
EESA06H3
Professor
Nick Eyles

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EESA06 Lecture 5
When oceans close is the dangerous volcanoes t because of subduction.
Raeology t ability to flow, how easy does that magma flow?
- Iceland is very fluid t not that dangerous, all gases come out
- More viscosious - dangerous, stuff comes out t pyroclastic
- Pyroclastic t broken by fire, rocks are shattered by eruptions and thrown up into air
- Volcanic bombs or ash(is a misnomer - named improperly)
o Italy thought it was coal burning
The Green Areas t subduction back into the mantle
- Friction (earthquakes), melting (volcanoes)
- Similar to lava lamp
The Pacific Ring of Fire: Tectonics of a closing ocean
- Pacific Rim - Dense concentration of volcanes, major
earthquakes, tsunamis
Subduction:
- The stars marks earthquakes - The deepest earthquakes are
700km down
- tlv}ÁZo}v[uo]oo(óììlu}Áv
- Magmatic Arc t a line of volcanoes directly above subduction
zone
- Oceanic crust t made out of basalt
- Silicic magma - Sediment + seawater melted, reducing
viscosiy of magma
- Deep water trenches t ocean floor going down into
subduction zone
New Zealand: small island, exposed tip of a much larger land mass
(Zealandia)
- Red Boundary - Pacific plate and Austrailian Plate
o Bottom: Austrailian Plate is being subducted under
Pacific Plate
o Top: Pacific Plate is being subducted under
Austrailian Plate (older oceanic crust is heavier)
o Middle: Obduction - Colliding continental crust
together
- Obduction t Himalayas, creating high mountains
www.notesolution.com
Continential Crust Collides with Continenetial Crust:
- The Southern Alps t Mt.Cook in New Zealand
White Island t young volcano
- Lateral (side) blast t highly dangerous
- Caused by sector colapse
- Sulfuric acid t natural pollution
Merapi Volcano t /v}v][u}vP}µ
- Killed the gate keeper that protected the volcano
- Steep Volcano t very susceptible to sector collapse
Subduction: Older oceanic crust going under
younger crust
- Japan & Indonesia
- When you collide two oceanic crust,
creates continential crust, generates new
lands
- Proto-continents t first continents
Eruption:
1) Pyroclastic Flow - White areas t with gas and boulders
2) Lahars t debris flow t similar to concrete
D][]t stable
Top of Merapi t very unstable because has thick plug of magma
being pushed up, building a cap and its beginning to fall off
- Large cracks
www.notesolution.com

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Description
EESA06 Lecture 5 When oceans close is the dangerous volcanoes J because of subduction. Raeology J ability to flow, how easy does that magma flow? - Iceland is very fluid J not that dangerous, all gases come out - More viscosious - dangerous, stuff comes out J pyroclastic - Pyroclastic J broken by fire, rocks are shattered by eruptions and thrown up into air - Volcanic bombs or ash(is a misnomer - named improperly) o Italy thought it was coal burning The Green Areas J subduction back into the mantle - Friction (earthquakes), melting (volcanoes) - Similar to lava lamp The Pacific Ring of Fire: Tectonics of a closing ocean - Pacific Rim - Dense concentration of volcanes, major earthquakes, tsunamis Subduction: - The stars marks earthquakes - The deepest earthquakes are 700km down - JlL}ZZoZ}L[Ko]oolK}L - Magmatic Arc J a line of volcanoes directly above subduction zone - Oceanic crust J made out of basalt - Silicic magma - Sediment + seawater melted, reducing viscosiy of magma - Deep water trenches J ocean floor going down into subduction zone New Zealand: small island, exposed tip of a much larger land mass (Zealandia) - Red Boundary - Pacific plate and Austrailian Plate o Bottom: Austrailian Plate is being subducted under Pacific Plate o Top: Pacific Plate is being subducted under Austrailian Plate (older oceanic crust is heavier) o Middle: Obduction - Colliding continental crust together - Obduction J Himalayas, creating high mountains www.notesolution.com
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