Class Notes (904,816)
CA (538,328)
UTSC (32,636)
EESA06H3 (607)
Nick Eyles (536)
Lecture

Lecture 2

3 Pages
79 Views

Department
Environmental Science
Course Code
EESA06H3
Professor
Nick Eyles

This preview shows page 1. Sign up to view the full 3 pages of the document.
Lecture 2- EESA06
2 types of crust
oOceanic crust- relatively high density, so it wants to sink back down into the plastic rocks
underneath, so it creates these large ocean basins
oContinental crust
Moho- the base of the crust
Drilling down is about 12 km, as you go down with depth, it gets hotter
oThe deepest mine in the world is 4 km down in South Africa
The deeper interior of the planet is the result of geophysics
Earthquakes generate energy
oThere is 2 blocks of crust that move relative to each other, and the surface along which the
blocks have moved is call a fault plane, like a very long crack, the surface between the
moving blocks
oWhen the blocks move, it creates energy and we feel it as earthquake
oThe focus is where the energy is released, it is always on the ground
Might be several hundred km on the ground, might be 5 km
oThe epicentre, the point directly above the focus
oFault scarp:
oBluff is the steep slope that results when we move one block against another one
Seismic risk assessment: trying to identify what the danger is of the community result of an
earthquake
Rivers easier to erode along faults
Try to identify the morphologic
Seismic waves is energy produced by abrupt movements along the faults
Not all faults produce earthquakes
Most faults are locked and then they snap
oWhen they are locked, they are storing up energy and stress builds up and fault suddenly
move and it triggers an earthquake
Fault scarp in Japan in 1891, quite a famous earthquake
oThe Japanese had just imported a lot of Western technology
oThey started building Western style buildings and many of them fell down
oThe tradition way of building buildings, which is flexible was the best
oTriggering earthquakes every 50-100 years
Seismic waves can be divided into several different types:
oBody waves: they go all the way down through Earths interior, across the entire planet
Primary (P) waves- used to map the interior of the planet
Secondary (S) waves- used to map the interior of the planet
oSurface waves: they go all the way around the planet, but they go on the surface
P waves- compression waves
oQuickest, the superman of seismic waves
oTravel up to 7km/second
oMove through materials by alternating compression and extension
oExample, elastic band is a rock and stretching and compressing
S waves
oSlower- 5km/second
oExample, had a rope stretched out and creating a wave
If there is an earthquake, the P waves is going to arrive first at a remote location
Seismograph: instrument, Seismogram is the record
www.notesolution.com

Loved by over 2.2 million students

Over 90% improved by at least one letter grade.

Leah — University of Toronto

OneClass has been such a huge help in my studies at UofT especially since I am a transfer student. OneClass is the study buddy I never had before and definitely gives me the extra push to get from a B to an A!

Leah — University of Toronto
Saarim — University of Michigan

Balancing social life With academics can be difficult, that is why I'm so glad that OneClass is out there where I can find the top notes for all of my classes. Now I can be the all-star student I want to be.

Saarim — University of Michigan
Jenna — University of Wisconsin

As a college student living on a college budget, I love how easy it is to earn gift cards just by submitting my notes.

Jenna — University of Wisconsin
Anne — University of California

OneClass has allowed me to catch up with my most difficult course! #lifesaver

Anne — University of California
Description
Lecture 2- EESA06 2 types of crust o Oceanic crust- relatively high density, so it wants to sink back down into the plastic rocks underneath, so it creates these large ocean basins o Continental crust Moho- the base of the crust Drilling down is about 12 km, as you go down with depth, it gets hotter o The deepest mine in the world is 4 km down in South Africa The deeper interior of the planet is the result of geophysics Earthquakes generate energy o There is 2 blocks of crust that move relative to each other, and the surface along which the blocks have moved is call a fault plane, like a very long crack, the surface between the moving blocks o When the blocks move, it creates energy and we feel it as earthquake o The focus is where the energy is released, it is always on the ground Might be several hundred km on the ground, might be 5 km o The epicentre, the point directly above the focus o Fault scarp: o Bluff is the steep slope that results when we move one block against another one Seismic risk assessment: trying to identify what the danger is of the community result of an earthquake Rivers easier to erode along faults Try to identify the morphologic Seismic waves is energy produced by abrupt movements along the faults Not all faults produce earthquakes Most faults ar
More Less
Unlock Document


Only page 1 are available for preview. Some parts have been intentionally blurred.

Unlock Document
You're Reading a Preview

Unlock to view full version

Unlock Document

Log In


OR

Don't have an account?

Join OneClass

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

Sign up

Join to view


OR

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.


Submit