What is the epicenter?
The focus is the place inside Earth's crust where an earthquake originates.
Explain what foreshocks are.
Small-scale earthquakes that occurs before the actual, larger earthquake.
How does an Earthquake happen?
Energy is released and causes movement of the ground.
Explain what aftershocks are.
Smaller earthquakes that happen after the main earthquake.
Why do earthquakes happen?
Because Earth`s tectonic plates are in constant movement.
What are fault planes?
Irregularities that grind the plates to a halt. Typacally a curved interface.
How long does an Earthquake usually last?
A few seconds.
Where is the hypocenter located?
700km below the Earth's surface.
What is a seismometer?
It's an instrument that measures and records seismic waves that move through the Earth.
What do seismic waves do?
Transmit an earthquakes energy over great distances.
What's an epicenter?
The point on the Earth's surface above the focus of the earthquake.