Fault

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29 Νοε 2013 (πριν από 3 χρόνια και 11 μήνες)

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QUIZ

1.
What are Earthquakes?

2.
_____ is the deformation of a
material caused by stress.

3.
Describe tension stress.

4.
Faulting causes rock to _________ .

Answers

1.
Vibrations of the earth’s crust caused by
a sudden release of energy


2. Strain



3. pulls apart


4. Break

Faulting


When stress exceeds the
strength of the rocks movement
occurs along a weak region in the
rock called a fault


Movement along the fault results
in EQ’s

Faults


Fault

= any fracture or system of
fractures along which the Earth
moves


Fault Plane
= the surface along which
the movement takes place

Example of Faulting


Cracks in the concrete


The crack represents

strain

resulting
from
stress

use by cars & people



The crack itself is a

fault


The concrete surface where the fault
occurred is the

fault plane

The type and direction of stress on the
concrete results in different types of
faults


3 Types of Faults

Normal

= rocks are pulled apart; Tension
(stress) causing horizontal & vertical
movement


p. 531 Table 19.1

3 Types of Faults

Reverse or Thrust Faults
=
rocks
are forced together; Compression
(stress) causing horizontal &
vertical movement



p. 531 Table 19.1


3 Types of Faults


Strike Slip
= rocks are shearing,
twisting; Shear (stress) causing
horizontal movement


p. 531 Table 19.1


Animation of Faults



http://earthquake.usgs.gov/learning/animatio
ns/



Reference USGS

Comparison between types of
fault & plate boundaries


What type of fault is associated
with converging plates?


Reverse or Thrust Fault

What type of fault is
associated with divergent
plates?


Normal Fault

What type of fault is associated
with transforming plates?


Strike


Slip Fault


Text read p.
530


532


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