Lesson 4

Question 1

It is a natural phenomenon that occurs in different parts of the world.

Answer 1

Earthquake

Question 2

It is the weak or violent shaking of the earth’s surface caused by the sudden
movement of rock materials beneath it.

Answer 2

Earthquake

Question 3

These are cracks on the Earth’s surface along which smaller plates move
on slip against each other.

Answer 3

FAULT LINES

Question 4

The place where the energy is released like an explosion

Answer 4

Focus

Question 5

It is the point that is immediately above the focus

Answer 5

EPICENTER

Question 6

It is the measure of the total energy released at the earthquake’s point of
origin which is below the Earth’s surface.

Answer 6

Magnitude

Question 7

It is used to measure the strength of an earthquake

Answer 7

RICHTER MAGNITUDE SCALE

Question 8

It is the perceived strength of an earthquake based on the relative effect on people and structures on the Earth’s surface.

Answer 8

INTENSITY

Question 9

It is caused by the passage of seismic waves beneath structures

Answer 9

GROUND SHAKING

Question 10

It is the displacement of the ground due to the violent shaking of the surface

Answer 10

GROUND RUPTURE

Question 11

It takes place when there is an increase in water pressure in saturated soil because of ground shaking

Answer 11

LIQUEFACTION

Question 12

The lowering of the land surface occurs for many reasons such as the extraction of ground water and natural gas, mining,
and earthquakes

Answer 12

GROUND SUBSIDENCE

Question 13

It is a series of large waves resulting from the disturbance of
sea water commonly due to an earthquake

Answer 13

TSUNAMI

Question 14

EARTHQUAKE PREPAREDNESS AND RISK REDUCTION

Answer 14

1. Duck
2. Cover
3. Hold