earthquakes grade 9

Q1. What is an epicenter?

• The point on the earths surface directly above the seismic focus.

• The point of origin of seismic waves.

What is a fault?

• A fracture in the earths crust along which the blocks of crust have either side moved relative to one another

• Where two plates move toward each other.

Which travels fastest, always being the first detected by seismic stations?

• P waves
• S waves

An instrument that detects and measures earthquakes is a 

• seismogram
• focus seismic map
• focus
• seismograph 

Most earthquakes happen along the _________________. 

• coast
• faults
• desert
• directions

Earthquakes under the water can cause _________________________________.

• tornadoes
• tsunamis
• lightening
• hailstorms

The Richter scale measures:

• the amount of radon gas released

• the movement of plates

• the power of an earthquake

• the weight of tectonic plates

A part of San Andreas Fault in the USA lies in the _________