Earthquakes Section 2-1

The shaking and trembling that results from a sudden movement in part of the Earth's crust is a(n) __________________________________.

An earthquake that occurs on the ocean floor which in turn creates or produces a giant sea waves known as a(n)_______________________________.

During an earthquake the point beneath the Earth's surface where the rocks break and suddenly shift or move is called the _________________________________.

During an earthquake the most violent shaking is found above the focus at the ___________________________________.

Seismologists have learned a great deal about the interior of the Earth and earthquakes by studying ____________________________________.

The seismic wave that is the fastest and travels through solids, liquids and gases and arrive at a given point before any other type of seismic wave is called the ________________________________ wave.

Earthquake wave that arrives at a given point after the primary wave and can only travel through solids and not liquids and gases is called the ___________________________________ wave.

The slowest moving seismic wave that arrives at a given point after both the primary and secondary waves that moves along the Earth's surface the way waves travel through the ocean is the ____________________________________ wave.

A scientist who studies earthquakes and seismic waves is called a(n) ____________________________.

The instrument that detects and measures seismic wave activity is called a(n) ________________________________ machine.

A print out of recorded waves of an earthquake that shows its intensity level is called a(n) ___________________________________.

Today the strength of an earthquake is measured according to the _____________________________ scale.