What is an Earthquake?
Earth's Interior
Earth's Interior
Seismology: the study of Earthquake Waves
Determining the size of an earthquake.
Miscellaneous
Earthquake destruction, occurrence, and prediction
100
When an earthquake occurs, energy radiates in all directions from its source. The source is referred to as the ___.
What is a hypocenter or focus?
100
This type of wave has the highest velocities (speed in a given direction)?
What is Primary (P)-Waves?
100
Roman Numerals I (1) to XII (12)that rate the structural damage due to an earthquake is called _______.
What is The Mercalli Scale?
100
Oceanic crust is composed primarily of ___.
What is basalt?
100
When an earthquake occurs in the seafloor like along an oceanic plate boundary a ____ can occur.
What is a tsunami?
200
The area surrounding a region that experienced a large earthquake needs time to adjust to the displacements on the main fault causing ____.
What is an aftershock?
200
Suspended weight that moves independently of Earth allows for a ______ to work.
What is a seismograph?
200
The ______ is determined by making direct observations in teh area affected by an earthquake?
What is intensity?
200
Earthquakes result form the ____ release of elastic energy previously stored in rocks surrounding a zone of ___ movement.
What is rapid; fault?
200
If you are on a beach, you might recognize that a tsunami is approaching because the water will _____ from the beach farther than usual.
What is withdraw?
300
High confining pressure increases friction on the fault making faults ____.
What is "locked"?
300
Overall, this type of seismic wave is the most destructive.
What is surface waves?
300
One measurement that is widely used to determine how far the focus of an earthquake is from the seismograph where it is recorded is ____.
What is the difference in travel time between the P and the S wave?
300
In North America the highest potential for large tsunamis is in the coastal regions of ____.
What is the Pacific Coast and Hawaii?
300
Most earthquakes occur along ___ plate boundaries.
What is a convergent? (think of subduction zones)
400
The most likely area where you will see major earthquakes?
What is in the mountain belt?
400
The diagram shows the use of triangulation by pinpointing the location of the ____. 
ng an ____.
What is the epicenter?
400
An earthquake magnitude scale is a measure of ____.
What is energy released?
400
Oceanic crust is ____ than continental crust.
What is denser (heavier)?
400
Strike-slip (slide past each other) faults are common along ___ plate boundaries.
What is a transform?
500
The position on Earth's surface directly above the earthquake source is called the ____.
What is the epicenter?
500
S Waves can travel through ___.
What is solid media only?
500
Structural damage from _____ vibrations would be worse where older buildings were built on a thick layer of sediment.
What is seismic?
500
___ is the weak layer.
What is the asthenosphere?
500
Where normally solid material behaves more like a fluid during an earthquake occurs because pore spaces between particles in unconsolidated sediments close and and displace fluids is known as ____.
What is liquification?