Class Notes (837,009)
Canada (509,985)
EESA06H3 (568)
Nick Eyles (500)
Lecture 5

EESA06 Lecture 5.docx

8 Pages
Unlock Document

Environmental Science
Nick Eyles

EESA06 Lecture 5 Page 1 EESA06 Lecture 5 When oceans close is the dangerous volcanoes – because of subduction. Raeology – ability to flow, how easy does that magma flow? - Iceland is very fluid – not that dangerous, all gases come out - More viscosious - dangerous, stuff comes out – pyroclastic - Pyroclastic – 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 – 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 - We know that slabs don’t melt till after 700km down - Magmatic Arc – a line of volcanoes directly above subduction zone - Oceanic crust – made out of basalt - Silicic magma - Sediment + seawater melted, reducing viscosiy of magma - Deep water trenches – 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 – Himalayas, creating high mountains EESA06 Lecture 5 Page 2 Continential Crust Collides with Continenetial Crust: - The Southern Alps – Mt.Cook in New Zealand White Island – young volcano - Lateral (side) blast – highly dangerous - Caused by sector colapse - Sulfuric acid – natural pollution Merapi Volcano – Indonesia’s most dangerous - Killed the gate keeper that protected the volcano Subduction: Older oceanic crust going under younger crust - Japan & Indonesia - When you collide two oceanic crust, creates continential crust, generates new lands - Proto-continents – first continents Model of Merapi - Steep Volcano – very susceptible to sector collapse Eruption: 1) Pyroclastic Flow - White areas – with gas and boulders 2) Lahars – debris flow – similar to concrete EESA06 Lecture 5 Page 3 Merapi’s sister – stable Top of Merapi – very unstable because has thick plug of magma being pushed up, building a cap and its beginning to fall off - Large cracks When erupts – gase and large masses of rock rolling down - Pyroclastic flows - Rich soils – farming at base of volcano After the pyroclastic flows – the large boulders - Mt.Winson killed 30 journalists Flow deposits – burnt stuff buried - Charred woods – dark oval Japan: Volcanic arc - Earthquake nation, most danergous place on pacfic rim - More volcanoes, active faults - Tokyo – four plates combined here Arc of volcanoes becomes an island Chikyu – the earth - Drill ship – can drill 7km down into ocean floor - Made out of derrick – the drilling apparation - Riser system – can withstand high gas pressures - Want to drill down into mantle – new source of energy + mineral deposits etc. - Want to find an early warning system for earthquakes EESA06 Lecture 5 Page 4 Mount Fuji and the City of Fujioshida - Famous for fire festival - Make offerings to the volcano - Pyres – light these for celebration Mount Un
More Less

Related notes for EESA06H3

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.