Earthquakes
A measurement of an earthquake's strength is called its _____.
Magnitude
A(n) _____ eruption has magma that flows easily with gases bubbling out gently.
Quiet
Tsunamis are caused by what?
Earthquakes under the sea
A change in rock that is caused by stress bit is NOT permanent is called _____ strain.
Elastic
_____ are shakes that occur BEFORE an earthquake.
Foreshock
The _____ is the point below Earth's surface which breaks and triggers an earthquake.
Focus
A string of islands, called a(n) _____ is created by volcanoes near boundaries where two oceanic plates collide.
Island arc
Tsunami is a Japanese word which in English translates to _____.
Harbor waves
A change in rock that is caused by stress and creates permanent change is called _____ strain.
Plastic
What is the Shadow Zone?
Seismic waves can not pass
In a normal fault, the part of the fault that lies below the other part is called the _____.
Footwall
A _____ is formed when groundwater is heated by a nearby body of magma and eventually rises to the surface to collect in a natural pool.
Hot spring
The speed of tsunamis is equivalent to _____.
Jet planes
A block of rock that lies above a fault is called a _____ wall.
Hanging
What tool is used to measure earthquakes?
Seismograph
What kind of fault results in a horizontal shift?
Strike-slip
Water heated by magma can provide an energy source called _____ which can heat homes and make electricity.
Geothermal energy
How long could it take a 20 foot tsunami to reach land?
30 minutes
Stress that pushes a mass of rock in two opposites directions is called _____.
Shearing
The point on the surface directly above the focus is the _____.
Epicenter
Earthquakes are caused by all of the following EXCEPT what?
Tsunamis
_____ is a volcano that is currently not active, but may become active in the future.
Dormant
Which describes the relationship of the height of a tsunami to the depth?
Height of a tsunami wave increases
as the depth of the ocean decreases
A force that acts on rock to change its shape or volume is called _____.
Stress
The _____ is the arrival time difference between the first P-wave and the S-wave.
Lag time