EASC 3170
L2
Gravity: mass, force and acceleration
!
Textbook:
Recommended: Keary, Brooks and Hill, An Introduction to
Geophysical Exploration
" I will bring the book to class for the rest of this week and to next
weeks lab so that you can look at it
!
P

EASC 3170
L7
G6: Gravity anomalies continued
! Most
mistakes were either units, or other
numerical errors. BE CAREFUL! NASA
crashed a rocket into Mars because of a
unit error
! If I ask for comments, I expect you to
comment. Show me that you can think
li

EASC 3170
L4
Gravity corrections
DECREASING
Quiz 2
Part 1: Gravity
Key Ideas:
1) Gravity is the force of attraction between two masses
2) If you change the local density, gravity changes minutely
3) We measure this with high precision and try to `invert f

EASC 3170
L5
Gravity anomalies
Gravimeter app by
Jian Li
About $10
Look for an app that
gives gravity in mGal
Ideally 8-10 of you
will have one by
Tuesday
! What
are anomalies and why do we care?
! Regional
Residual separation
! Forward
gravity models
!

EASC 3170
L6
Gravity anomalies continued
Quiz 3 results
! Tomorrow
in 4069 (computer lab)
! Find yourself a partner
! You may hand in one or two labs per pair
! Look for a gravimeter app
! We
will (1) Take a gravity survey in the
stairwell and (2) Do grav

EASC 3170
L4
Gravity corrections
Part 1: Gravity
Key Ideas:
1) Gravity is the force of attraction between two masses
2) If you change the local density, gravity changes minutely
3) We measure this with high precision and try to `invert for
the density
(x,

Seismic Exploration
This part of the course is divided into 3 main sections
1.
General Principles of Wave Propagation
2.
Seismic Refraction
3.
Seismic Reflection
Average: 64%
Average: 66%
Average: 68%
Average: 59%
EASC 3170
S1: Seismology basics
3 scales

Seismic Exploration
This part of the course is divided into 3 main sections
1.
General Principles of Wave Propagation
2.
Seismic Refraction
3.
Seismic Reflection
! Lab
tomorrow in this room
We will start with short lecture then an exercise
Bring a ruler

EASC 3170
L9
G6: Gravity wrap-up, magnetics beginning
Reminders: Lab 2 due NOW.
Next quiz, on gravity anomalies, etc, Monday.
Next lab, using Potent, in both upstairs computer labs
Meet in 4169
Survey on D2L
! Review
! Using
free-air and Bouger anomalies

EASC 3170
L3
Gravity: measuring g
Part 1: Gravity
Key Ideas:
1) Gravity is the force of attraction between two masses
2) If you change the local density, gravity changes minutely
3) We measure this with high precision and try to `invert for
the density
(x

Seismic Exploration
This part of the course is divided into 3 main sections
1.
General Principles of Wave Propagation
2.
Seismic Refraction
3.
Seismic Reflection
EASC 3170
S2: Seismology basics, part 2
When Waves Meet Boundaries - wavepaths
Seismic veloci

EASC 3172
Module 2: DC Resistivity
L2: Resistivity Arrays
[We use resistivity arrays of 4 electrodes to
find the apparent resistivity of the ground.]
Resistivity vs resistance
Resistivity of common crustal materials
Resistivity arrays
Ohm`s Law for an ele