It is not my fault
The crack in the earth's crust where stress is suddenly released causing an earthquake.
What is a fault?
These seismic waves can travel through all of the earth's layers.
What are P-waves (Primary waves)?
Where rocks first begin to move in an earthquake.
What is the focus?
This instrument is attached to a seismograph and does NOT move, but rather record's the drum's vibrations.
What is a weighted pen?
What are earthquakes?
Earthquakes are caused when too much of this has built up in rocks and they can no longer handle it.
What is stress?
These seismic waves cannot travel through the liquid outer core of the earth.
What are S-waves (Secondary waves)?
The name of the location directly above the focus.
What is the epicenter?
This instrument constantly records ground movement in the earth.
What is a seismograph?
Earthquake activity may result in the formation of these geologic features as 2 tectonic plates converge at a plate boundary.
What are mountains?
Earthquakes occur along a fault in this layer of the earth.
What is the Lithosphere (Crust)?
These seismic waves come from both P and S waves and usually cause the most damage.
What are surface waves?
Most earthquakes occur along these areas because their slow movement causes large amounts of stress to build up over time.
What are plate boundaries?
The minimum number of stations needed to locate an earthquake's epicenter.
What is 3?
Which of the following can cause damage days or months after a large earthquake?
What is aftershock
The risk of earthquakes is high along the Pacific coast of the United States because
What is that’s where the Pacific and North American plates meet.
a series of low-frequency shock waves, somewhat like sound waves, traveling through the earths crust
What are earthquakes?
During an earthquake, the most damage occurs here.
What is at the epicenter?
What does a seismograph record?
What is the ground movements caused by seismic waves
The boundary between two tectonic plates that are moving away from each other
What is a divergent boundary?
What happens when friction between the opposite sides of a fault is high?
The fault locks, and stress builds up until an earthquake occurs.
The direction(s) that seismic waves travel when an earthquake occurs.
What is in all directions?
This wave arrives at the surface first and compresses and expands the ground.
What is a P wave?
The zig-zag lines recorded on a seismograph drum as it vibrates due to the release of energy from seismic waves.
What is a seismogram?
A measure of the earthquake's energy
What is the moment magnitude?
The boundary between two tectonic plates that are moving toward each other often locations of subduction and mountain building
What is a convergent boundary?
Forces or stresses that act to squeeze or crush an object or substance
What is compression?
The risk is high for a severe earthquake along the west coast of North America due to this type of plate boundary.
What is convergent?
Seismic waves lose this as they travel away from the focus of an earthquake.
What is energy?
This type of plate boundary forms rift valleys and causes earthquakes in Africa.
What is divergent?