Section 12-3 Review
page 308 #s 1-6
Directions: Write down the question and
the answer for each question on a piece
of paper to be included in your Chapter
12 Notebook.
#1
Discuss the relationship between
tsunamis and earthquakes.
Undersea earthquakes cause sudden
changes in the level of the ocean floor.
This makes the water above drop or rise
and sets in motion a series of long, low
waves.
Tsunamis can be caused
by . . .
Volcanoes
Earthquakes
Landslides
http://video.google.com/videoplay?docid=-529794418106164793&hl=en
http://video.google.com/videoplay?docid=916410440854736668
http://video.google.com/videoplay?docid=-4276800493180740813
http://news.bbc.co.uk/cbbcnews/hi/newsid_4130000/newsid_4137800/4137839.stm
#2
Describe two possible effects of a major
earthquake on buildings.
They may sway with the force of the
earthquake so that they tip over onto
nearby structures or they may collapse.
Liquefaction
http://video.google.com/videoplay?docid=32116389448553990&q=liquefaction&hl=en
#3
List three safety rules to follow when an
earthquake strikes.
1-Remain calm and move to a safe position
between tremors;
2-Stand in a doorway or crouch under a
desk to avoid falling debris;
3-Stay away from windows or large objects
that may fall; in a car, avoid buildings,
power lines, or bridges.
#4
Describe how identifying seismic gaps
may help scientists predict earthquakes.
Locations where relatively few earthquakes
have occurred recently but have occurred
in the past may be sites of future
earthquakes if stress builds up there.
Seismic Gap
http://geology.utah.gov/utahgeo/hazards/eqfault/eqfact.htm
#5
Identify changes in rocks that may signal
earthquakes.
 ground tilt
 cracks in rocks caused by stress
 change in water content that could alter
the rock’s magnetic or electrical properties
 gas seepage
How do scientists try to
predict earthquakes?
 Seismic Gaps
 Foreshocks
 Changes in Rocks
Changes in Rocks
Are earthquake forecasts
reliable?
It is mostly UNRELIABLE.
Scientists can generally identify earthquake
prone areas, but they cannot identify
exactly where and when an earthquake
will happen.
#6
What type of building construction and
location regulations should be included in
the building code of a city that is located
near an active fault?
Buildings or dams should be constructed on solid rock.
Plans should be approved by experts to ensure that
buildings are constructed from materials that won’t
loosen and fall off and that they are designed to
withstand the motion of the ground during an
earthquake. Utility lines and cables should be protected
to prevent fires and explosions.
The End ???