The instrument that senses movement due to seismic waves
What is a seismometer?
100
Broken pipelines that can cause fires, aftershocks, avalanches and damaged roads and buildings.
What are possible after effects of earthquakes?
100
The measure of 'how large an earthquake' is.
What is 'magnitude?'
100
A volcano that is considered to be ‘dead’ and unlikely to erupt again – it hasn't erupted for 1000’s of
years. It's magma chamber is empty.
What is an extinct volcano?
200
Plates slip past each other until they lock up. They remain locked until there is enough energy to release them.
What happens at a transform boundary to cause an earthquake?
200
These are waves that move more slowly than P and S waves,
and produce major ground movement. They roll like
ocean waves as they shake buildings side to side.
What are surface waves?
200
Reinforce walls and windows, isolate the base of buildings, anchor into bedrock, and use flexible building materials.
What should be done to help buildings survive earthquakes?
200
Three earthquake rating scales - each has its own merits and measures different things.
What are Mercalli, Richter and Moment Magnitude?
200
A volcano that will awaken in the future, become active in a relatively short amount of time (100 to 200 years).
What is a dormant volcano?
300
The sudden release of energy in the Earth caused by movement!
What is an earthquake?
300
Seismic waves that arrive second to the seismometer, shake the ground back and forth, and can not travel through liquids.
What are 'S' or secondary waves?
300
Stop, Cover, and hold on!
What should people do inside a room when an earthquake is occurring?
300
The place on the Earth directly above the focus (where on the map is ...).
What is the epicenter of an earthquake?
300
A volcano that is erupting now or shows signs it will erupt in the future
What is an active volcano?
400
A force in rock that changes its shape and/or volume.
What is stress?
400
Waves that arrive first to the seismometer, expand and compress the ground, and are able to move through both solids and liquids.
What are P (Primary) Waves?
400
A large wave in the ocean that results from an earthquake.
What is a tsunami?
400
The scale that measures 'the total amount of energy released from an earthquake.'
What is the 'Moment Magnitude' scale?
400
Weak spots in the crust (do not have to be at a boundary) where magma reaches the surface. The Hawaiian islands were formed by these.
What is a hotspot?
500
The three types of stress that can change the shape or volume of rock by pushing, pulling or causing it to move in opposite directions.
What are compression, tension and shearing?
500
By seismic waves known as primary, secondary and surface waves.
How does energy released by an earthquake travel?
500
The release of snow or rocks on a mountain induced by the movement from an earthquake.
What is a landslide?
500
The place in the lithosphere where the 'break' occurs triggering the earthquake.
What is the focus of an earthquake?
500
A weak spot in the crust where magma erupts to the Earth's surface.