Planet Earth: Topic 5 - Earthquakes
It is likely that San Diego is able to get early warnings of possible earthquakes in the area because
of this attraction ...
San Diego Zoo
(Text p. 395) Because animals have often thought to 'predict' earthquakes the Zoo would
most likely be the best place to provide an early warning.
x San Diego Emergency Center
x San Diego Observatory
x Pacific Climatology Center
Seismologists use a special machine that measures earthquakes. The primary wave is the fastest
of all three types of seismic waves and can pass through solids liquids and gases. A p wave effect
would be ...
x buildings toppling
x overpasses crumbling
(Text p. 398) Primary waves would only rattle dishes on a shelf.
x cracks opening up in the street
3. An earthquake in Japan registers on a seismograph in Winnipeg, Manitoba. This occurs because ...
x seismographs anywhere will record all earthquakes
x the earth's crust is solid, allowing the surface waves to be recorded anywhere
x the inner core of the earth is liquid
the outer core of the earth is liquid
(Text p. 398) Figure 5.52 The outer core must be liquid
The source of an earthquake can be determined by recording the interval time between the p
waves and s waves. The source deep below the surface in the crust, where the earthquake begin is
called the ...
(Text p. 399) Figure 5.53
x shadow zone
The pressure under the earth's crust can cause it to move in different ways. A fault that is caused
by a compression force is called a ...
x normal fault