WorksheetsEarthquakes
Total questions: 14
Worksheet time: 9mins
According to elastic rebound theory, earthquakes occur when stresses on rocks become too great and the rocks________
become deformed
fracture and form a joint
return to their original shape
are permanently stretched out of shape
The focus of a shallow earthquake is
less than 70 km below the surface.
between 70 and 300 km below the surface.
more than 300 kilometers below the surface.
none of the above
About 80 percent of all earthquakes take place
in the state of California.
at divergent plate boundaries.
along the Pacific Ring of Fire.
far from plate boundaries.
The wavelength of a wave can be measured by finding the distance between
the focus and the epicenter.
a P wave and an S wave.
a crest and a trough.
two adjacent crests.
Seismic waves that do the most damage are
body waves.
surface waves.
primary waves.
secondary waves.
Surface waves that produce a rolling motion are
P waves.
S waves.
love waves.
Rayleigh waves.
Tsunamis may be caused by
landslides.
meteorites.
nuclear explosions.
all of the above
Assume that an earthquake has a magnitude of 4 on the Richter scale. An earthquake that is 100 times stronger has a magnitude of
5
6
40
400
The moment magnitude of an earthquake is calculated from the
two of the following
amplitude of the seismic waves.
length of the fault.
distance the ground moves.
Finding the amplitude of a seismic wave is one way of determining its
magnitude
intensity
wavelength
wave speed
If a seismogram records only P waves and surface waves for an earthquake, the earthquake must be
very close to Earth’s surface.
very far below Earth’s surface.
extremely close to the seismograph.
on the opposite side of Earth from the seismograph.
Earthquake scale based on the total energy released in an earthquake
Richter magnitude scale
Mercalli intensity scale
moment magnitude scale
Earthquake scale based on the height of seismic waves on a seismogram
Richter magnitude scale
Mercalli intensity scale
moment magnitude scale
Earthquake scale based on information such as the damage done to buildings
Richter magnitude scale
Mercalli intensity scale
moment magnitude scale
