The location within Earth along a fault at which the first motion of an earthquake occurs.
What is the Focus?
100
Body waves that cause particles of rock to move in a side-to-side direction that is perpendicular to the direction in which the waves are traveling
What are S-waves?
100
Instrument used to detect and record vibrations in the ground
What is a Seismograph?
100
The major fault in western California
What is the San Andreas Fault?
100
Total destruction
What is XII?
200
The measure of the strength of an earthquake
What is Magnitude?
200
Body waves that cause particles of rock to move in a back-and-forth direction that is parallel to the direction in which the waves are traveling
What are P-waves?
200
Measure of the effects of an earthquake
What is Intensity?
200
An earthquake measuring 7.9 devastated this country just before it hosted the Olympic Games in 2008
What is China?
200
Felt by only a few people at rest; delicately suspended items may swing
What is II?
300
Seismic actions that sometimes may precede earthquakes by a few seconds or a few weeks
What are foreshocks?
300
Surface waves that cause rock to move side-to-side and perpendicular to the direction in which the waves are traveling
What are Love waves?
300
Scale that measures ground motion from an earthquake to find the earthquake's strength
What is the Richter Scale?
300
In 2005, an earthquake measuring 7.5 killed over 86,000 people and left about 3,000,000 homeless in this country
What is Pakistan?
300
Felt by nearly everyone; some objects broken; unstable objects overturned
What is V?
400
The sudden return of elastically deformed rock to its undeformed shape
What is elastic rebound?
400
Surface waves that cause the ground to move with an elliptical, rolling motion
What are Rayleigh waves?
400
Scale that expresses intensity in Roman numerals and provides a description of the effects of earthquake intensity
What is the Mercalli Scale?
400
The largest earthquake ever, measuring 9.5 occurred in this South American country
What is Chile?
400
Causes slight to moderate damage to ordinary buildings; some chimneys are broken
What is VII?
500
Area along a fault where relatively few earthquakes have occurred recently but where strong earthquakes occurred in the past
What is a seismic gap?
500
Location on Earth's surface where no body waves from a particular earthquake can be detected
What is a Shadow Zone?
500
The measurement of earthquake strength based on the size of the area of the fault that moves, the average distance that the fault blocks move, and the rigidity of the rocks in the fault zone
What is Moment Magnitude?
500
In 1811 and 1812, the vibrations from a series of earthquakes near this Missouri town caused damage as far away as South Carolina
What is New Madrid, MO?
500
Destroys some to most structures, including foundations; rails are bent