5.2 Earthquake measurement

Question 1

An instrument that records vibrations in the ground and determines the location and strength of an earthquake

Answer 1

Seismograph

Question 2

The point on Earth’s surface directly above an earthquake’s starting point or focus

Answer 2

Epicenter

Question 3

A tracing of earthquake motion that is created by a seismograph

Answer 3

Seismogram

Question 4

The point along a fault at which the first motion of an earthquake occurs

Answer 4

Focus

Question 5

It is a method used by seismologists to find the epicentre of an earthquake based on the difference in arrival times of P and S seismic waves as recorded at seismometer stations

Answer 5

Time Method

Question 6

The Richter scale, developed in the 1930s, is a base-10 logarithmic scale, which defines magnitude as the logarithm of the ratio of the amplitude of the seismic waves to an arbitrary, minor amplitude

Answer 6

Richter Magnitude Scale

Question 7

the great size or extent of something

Answer 7

Magnitude

Question 8

extreme degree of strength, force, energy, or feeling

Answer 8

Intensity