Transcript Document 7297189

2-1
2.2 Earthquakes
2.3
2.4 Earthquake2.4 Earthquake
Forces in the
&
Monitorint
safety
Safety
Earth’s Crust Seismic Waves earthquakes
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Stress that pushes a mass
of rock in two opposite
directions is called
shearing.
Because stress is a force, it
______ energy to rock.
adds
The squeezing together
of rocks by stress is
called ______.
compression
What stress is shown in C?
Tension
What stress is shown in D?
Shearing
Stress that pushes a mass of
rock in two opposite
directions is called
Shearing.
Because stress is a force it what
does it do the energy of rock?
Adds energy.
In a normal fault, the part of the
fault that lies below the other
part is called the ?
footwall.
What type of stress force produces
Reverse faults?
compression.
The land between two normal faults
that moves up is called?
Fault-block mountain
A device that uses wire stretched across a
fault to measure horizontal movement of
the ground is called ?
Creep meter.
A device that monitors both vertical and
horizontal ground movement?
GPS satellite system
What happens when friction between the
opposite side of a fault is high?
Which type of fault-monitoring device is
most like a carpenter’s level??
Tiltmeter.
Geologists cannot yet predict
earthquakes because?
they can’t be sure when and where stress
will be release along a fault.
Laser-ranging devices can detect even
tiny movements of the crust along a ___?
fault
With the range of data available,
geologists ___ predict exactly where and
when earthquakes will occur.
cannot
What can cause damage days or months
after a large earthquake?
An aftershock.
What is a building designed to reduce
the amount of energy that reaches the
building during an earthquake is
called a ?
Base-isolated building.
If the Coast Guard warns of a giant wave
of water approaching the shore as a
result of a major earthquake they are
warning of?
tsunami.
The best way to protect yourself in an
earthquake is to ?
Drop, cover, and hold..
The risk of earthquakes is high along the
Pacific coast of the United States because?
That’s where the Pacific and North
American plates.
Most earthquake-related deaths and
injuries results from?
Damage to buildings or other structures
The process in which the violent shaking
of an earthquake turns soft soil into
liquid mud is known as ?
liquefaction .
Earthquake damage can be reduced by
making buildings more ___________ so
that they twist and bend without
flexible
An earthquake that occurs shortly after
a larger earthquake is a(n)
____________________..
aftershock
Most active fault in the U.S. currently is?
San Andreas