8

Science
Quarter 2 – Module 1:
Earthquakes and Faults

CO_Q2_Science 8_ Module 1
Science – Grade 8
Alternative Delivery Mode
Quarter 2 – Module 1: Earthquakes and Faults
First Edition, 2019

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Published by the Department of Education

Secretary: Leonor Magtolis Briones
Undersecretary: Diosdado M. San Antonio

Development Team of the Module

Authors: Bryan S. Samonte, Novelita D. Celedio, Ailyn N. Lagura

Editors: Rhoda M. De Los Santos, Nonita C. Patalinghug
Reviewers: Bernabe Linog, Jonivil L. Vidal, Roy B. Piloton
Marilytte N. Ensomo, Rene G. Ebol
Illustrators: Angelo Zaldy C. Francia, Victor Genesis O. Odtohan
Layout Artist: Celeste Faith R. Almanon, Jay S. Ayap, Argie L. Ty
Management Team: Francis Cesar B. Bringas, CESO V
Isidro M. Biol, Jr.
Maripaz F. Magno
Josephine Chonie M. Obseñares
Gregoria T. Su
Marvilyn C. Francia
Jay S. Ayap
Nonita C. Patalinghug

Printed in the Philippines by ________________________

Department of Education – Caraga
Office Address: Learning Resource Management and Development Center
(LRMDC) Teacher Development Center J.P. Rosales Avenue, Butuan
City, Philippines 8600
Telefax: (085) 342-8207/ (085) 342-5969
E-mail Address: caraga@deped.gov.ph
 8

Science
Quarter 2 – Module 1:
Earthquakes and Faults
Introductory Message

This Self-Learning Module (SLM) is prepared so that you, our dear

learners, can continue your studies and learn while at home. Activities,
questions, directions, exercises, and discussions are carefully stated for you to
understand each lesson.

Each SLM is composed of different parts. Each part shall guide you
step-by-step as you discover and understand the lesson prepared for you.

Pre-tests are provided to measure your prior knowledge on lessons in

each SLM. This will tell you if you need to proceed on completing this module
or if you need to ask your facilitator or your teacher’s assistance for better
understanding of the lesson. At the end of each module, you need to answer
the post-test to self-check your learning. Answer keys are provided for each
activity and test. We trust that you will be honest in using these.

In addition to the material in the main text, Notes to the Teacher are
also provided to our facilitators and parents for strategies and reminders on
how they can best help you on your home-based learning.

Please use this module with care. Do not put unnecessary marks on any
part of this SLM. Use a separate sheet of paper in answering the exercises and
tests. And read the instructions carefully before performing each task.

If you have any questions in using this SLM or any difficulty in

answering the tasks in this module, do not hesitate to consult your teacher or
facilitator.

Thank you.

ii
 Lesson
How Do Movements Along
1 Faults Generate Earthquakes

What I Need to Know

This module was designed and written with you in mind. It is here to help you
master about earthquakes and faults. The scope of this module permits it to be used
in many different learning situations. The language used recognizes the diverse
vocabulary level of students. The lessons are arranged to follow the standard
sequence of the course. But the order in which you read them can be changed to
correspond with the textbook you are now using.

After going through this module, you are expected to:

Explain how movements along faults generate earthquakes. S8ES-IIa-14

1 CO_Q2_Science 8_ Module 1
 What I Know
Directions: Choose the letter of the correct answer. Write your answers on a separate
sheet of paper.

1. What is a crack or break in the lithosphere that can shift and cause an
earthquake?
A. Epicenter
B. Eruption
C. Fault
D. Focus

2. What do you call a fault where two blocks of crust pull apart and create space?
A. Normal fault
B. Reverse fault
C. Strike-slip fault
D. Transform fault

3. How will you describe the movement of the walls in a strike-slip fault?
A. moving sideways
B. pulling the side apart
C. pushing the side together
D. pushing and pulling the sides

4. How does a reverse fault form?

A. The blocks slide past each other.
B. The blocks pull apart from each other.
C. The hanging wall moves upward relative to the footwall.
D. The hanging wall moves downward relative to the footwall.

5. What do you call the amount of ground displacement in an earthquake?

A. Crack
B. Dip
C. Fold
D. Slip

6. What type of fault is illustrated in the picture?

A. Normal
B. Reverse
C. Strike-slip
D. Transform

Illustrated by: Angelo Zaldy C. Francia

2 CO_Q2_Science 8_ Module 1
7. How will you describe the movement of fault in this illustration?

A. moving sideways
B. pulling the sides apart
C. pushing the sides together
D. moving in vertical direction

Illustrated by: Angelo Zaldy C. Francia

8. Which of the following geologic features is an example of a reverse fault?

A. Anatolian fault
B. San Andreas fault
C. Himalayas mountain
D. East African rift zone

9. What refers to a vibration of the Earth due to the rapid release of energy?
A. Earthquake
B. Fault
C. Friction
D. Stress

10. Earthquakes happen along a fault line. Which of the following is NOT true about
fault?
A. It can be found on land.
B. It is where fault cyclone starts.
C. It can be found under the sea.
D. It is a break in the Earth’s crust.

11. In which type of fault can earthquake occur?

A. Normal
B. Reverse
C. Transform
D. All of these

12. Which type of fault would be least likely to occur along the valley?
A. Normal
B. Reverse
C. Thrust
D. Transform

13. What type of fault is illustrated in the picture?

A. Normal
B. Reverse
C. Strike-slip
D. Transform

Illustrated by: Angelo Zaldy C. Francia

3 CO_Q2_Science 8_ Module 1
14. The Alpine Fault cuts through New Zealand. At this location, two plates are
sliding past each other slowly over time. What type of fault exists at Alpine Fault?
A. Divergent
B. Normal
C. Reverse
D. Transform

15. What is the movement of a strike-slip fault?

A. Backwards
B. Downward
C. Sideways
D. Upward

4 CO_Q2_Science 8_ Module 1
 What’s In

If you can recall in Science 7, it was mentioned that the Philippines is situated
along the Pacific Ring of Fire. How does this affect us? People who live along the Ring
of Fire must anticipate the occurrence of earthquakes and volcanic eruptions.

Can you locate the Philippines on the globe? There are two ways by which you
can describe the location of a certain place on the globe. One is by determining its
latitude and longitude. The other is by identifying the landmasses and bodies of water
in the surrounding area.

In this module, you will understand how the movements of faults generate
earthquakes. Strong earthquakes have caused countless deaths all over the world,
even before people have started recording these events. These are unpredictable
forces of nature. They happen in no specific time and place. Up to this day,
seismologists are still figuring out how to detect seismic tremors accurately.

No one can stop earthquakes from happening. But there are things that people
can do to avoid or decrease the loss of life and damage to property. The first step is to
have a clear understanding of the occurrence of earthquakes.

5 CO_Q2_Science 8_ Module 1
 What’s New

Activity 1. It’s Your Fault

Directions: Identify each of the figures below whether it represents strike-slip fault,
normal fault, or reverse fault based on the given descriptions below. Write
your answers on a separate sheet of paper.

1. ___________________ 2. ____________________

3. _______________________

Figure 1: Types of Fault

Illustrated by: Angelo Zaldy C. Francia

Strike-slip fault - rocks are sliding past each other horizontally.

Normal fault - two blocks of crust pull apart create space, stretching the crust
into a valley. In a normal fault, the hanging wall drops down.

Reverse fault - also known as thrust fault, sliding one block of crust on top of
another. This fault is commonly found in collisions zones.

6 CO_Q2_Science 8_ Module 1
 What is It

An earthquake is brought about by an abrupt slip on a fault, much like what

happens when you snap your fingers. Going before the snap, you push your fingers
together and sideways. Since you are pushing them together, friction keeps them
from moving to the side. At the point when you push sideways hard enough to
overcome this friction, your fingers move unexpectedly, discharging energy in a form
of sound waves that set the air vibrating and travel from your hand to your ear,
where you hear the snap.

The same process goes on in an earthquake. Stress in the outer layer of the
Earth pushes the sides of the fault together. The grinding over the surface of the fault
holds the rocks together so they do not slip promptly when pushed sideways. In the
long run, enough pressure develops, and the rocks slip suddenly releasing energy in
waves that make a travel through the rocks to cause the shaking that we feel during
an earthquake.

Earthquake is the shaking of the surface of the Earth resulting from the
sudden release of energy in the Earth’s lithosphere. The energy will eventually be
released once the fault overcomes the friction movement.

Faults are thin zones of crushed blocks of rocks. These are often in centimeters
to thousands of kilometers long. Their surfaces can be vertical or horizontal. These
can expand into the earth and might possibly reach out up to the earth's surface.
These are also breaking in the Earth's crust where rocks on either side of the crack
have slid past each other. There are three kinds of faults: strike-slip, normal, and
thrust (reverse) faults. Each type is the outcome of different forces pushing or pulling
on the crust, causing rocks to slide up, down or past each other. The amount of
ground displacement in an earthquake is called the slip.

Strike-slip faults are rocks sliding past one another on a horizontal plane,
with little to no vertical movement. Examples to these are the San Andreas Fault and
the Anatolian Fault.

Normal faults are two blocks of crust layer pulling apart, extending the crust
into a valley thus, creating a space. A normal fault has the upper side or hanging
wall appears to have moved downward with respect to the footwall. The Basin and
Range Province in North America and the East African Rift Zone are two notable
districts where normal fault is spreading apart Earth's crust.

Reverse faults are also known as thrust faults, the slide one block of crust on
top of another. These faults are normally found in collision zones where tectonic
plates push up mountain ranges, for example, the Himalayas and Rocky Mountains.

7 CO_Q2_Science 8_ Module 1
 What’s More

When rocks slip past each other in faulting, the upper or overlying block along
the fault plane is known as the hanging wall, or headwall and the lower block is
known as the footwall. To learn more about this, let us answer Activity 2.

Activity 2. Describe Me

Directions: Choose the statements in column A that best describe each of the types
of faults in Column B. Write the letter of your answer on a separate sheet
of paper.

Column A Column B

1. Faults are pulling the A.

sides apart.

(a)

2. Faults are compressional, B.

pushing the sides together.

(b)

3. Faults have walls that C.

move sideways, not up or
down.

(c)
All illustrations by: Angelo Zaldy C. Francia

8 CO_Q2_Science 8_ Module 1
Activity 3. Trace It

Directions: Study the figure and refer to the legend below. Answer the questions that
follow. Write your answers on a separate sheet of paper.

City City City

A B C
City City City

D E F
Figure 3: Fault Map
Illustrated by: Bryan S. Samonte
Legend: Normal fault
Reverse fault
Transform fault

1. Which cities have valleys? _______________________

2. Which cities have mountains? _____________________
3. Which among the cities has the least probability of having an earthquake?
_____________________
4. How do movements along faults generate earthquakes?
___________________________________________________________________________
___________________________________________________________________________

Rubric

Advance Proficient Nearly Proficient Emerging

(4 points) (3 points) (2 points) (1 point)
Answer is well- Answer is Answer is not Answer does not
organized organized and organized and make sense and
and completely some details are details are unclear. shows no details.
explained the explained.
details.

9 CO_Q2_Science 8_ Module 1
 What I Have Learned

Directions: Fill in the blanks with the correct term to complete the statements.
Write your answers on a separate sheet of paper.
1. ______________ faults form when the hanging wall drops down.
2. ______________ faults form when the hanging wall moves up.
3. ______________ faults have walls that move sideways, not up or down.

4. ______________ is the shaking of the surface of the Earth resulting from the sudden
release of energy in the lithosphere.

5. ______________ are thin zones of crushed blocks of rocks. These are often in
centimeters to thousands of kilometers long.

What I Can Do

Activity 5. Where Will I Live?

Directions: Analyze Figure 3 below to help you decide on the safest city you want to
reside. Write your answers on a separate sheet of paper.

City City City

A B C
City City City

D E F
Figure 3: Fault Map
Legend: Normal fault
Reverse Illustrated by: Bryan S. Samonte
fault
Transform
fault

10 CO_Q2_Science 8_ Module 1
Questions:

1. Which cities are along the normal fault? ___________________

2. In which city is the safest place to build a house? ___________________
3. Why did you choose that city?
_________________________________________________________________________________
_________________________________________________________________________________
_________________________________________________________________________________

Rubric

Advance Proficient Nearly Proficient Emerging

(4 points) (3 points) (2 points) (1 point)
Answer is well- Answer is Answer is not Answer does not
organized organized and organized and make sense and
and completely some details are details are unclear. shows no details.
explained the explained.
details.

Assessment
Directions: Choose the letter of the correct answer. Write your answers on a separate
sheet of paper.

1. The stress along the outer layer of the Earth causes the build-up of energy. What
prevent the rocks from releasing this energy?
A. bending of rocks
B. vibration of the rocks
C. friction between rocks
D. energy released by rocks

2. Why do earthquakes occur frequently in Japan, Indonesia, and Philippines?

A. They are surrounded by seas.
B. They are located near the equator.
C. They are considered archipelagic countries.
D. They are found within the Pacific Ring of Fire.

3. Which factor keeps the rocks from slipping past each other?
A. Arrangement
B. Bending
C. Depth
D. Roughness

11 CO_Q2_Science 8_ Module 1
4. What type of fault formed the Rocky Mountains?
A. Normal
B. Reverse
C. Strike-slip
D. Transform

5. What happens to the rocks in a fault slip?

A. They stick together.
B. They slide past each other.
C. There is no movement at all.
D. They suddenly slip and generate earthquake.

6. What is referred to as a fracture between two blocks of rocks?

A. Earthquake
B. Fault
C. Stress
D. Volcano

7. What type of fault is the San Andreas fault?

A. Normal
B. Reverse
C. Strike-slip
D. Thrust

8. Which type of fault is described by two blocks of crust pushing together?

A. Normal
B. Reverse
C. Strike-slip
D. Thrust

9. Which of the following figures illustrates normal fault?

A. C.

B. D.

All illustrations by: Angelo Zaldy C. Francia

12 CO_Q2_Science 8_ Module 1
10. How do faults produce earthquakes?
A. Once friction is overcome, a fault slip produces earthquake.
B. Molten rock materials accumulate and go out along a fault.
C. Tectonic plates collide forming a volcano and causing earthquake.
D. Magma and lava cause the ground to move producing earthquake.

11. Which type of fault is described by a hanging wall slipping down the footwall?
A. Normal
B. Reverse
C. Strike-slip
D. Transform

12. What type of fault is described by rocks moving sideways past each other?
A. Converge
B. Normal
C. Reverse
D. Transform

13. What is referred to as the shaking of the Earth’s surface resulting from the
sudden release of energy in the lithosphere?
A. Earthquake
B. Fault
C. Friction
D. Stress

14. What type of fault shows two plates moving apart from each other?
A. Normal
B. Reverse
C. Strike-slip
D. Transform

15. How does a reverse fault form?

A. The blocks slide past each other.
B. The blocks pull apart from each other.
C. The hanging wall moves upward relative to the footwall.
D. The hanging wall moves downward relative to the footwall.

13 CO_Q2_Science 8_ Module 1
 Additional Activities

Activity 6. It’s Not Your Fault

Directions: Complete the crossword puzzle below. Write your answer inside the box.

Figure 4: Crossword Puzzle

Across
2. Other term for reverse fault
5. A vibration of the Earth due to the rapid release of energy
6. A type of fault that slides one block of crust on top of another
7. A force that holds the rocks together, so they do not slip promptly when
pushed sideways
Down
1. Two blocks of crust layer pull apart
3. A crack or break in the lithosphere that can shift and create an
earthquake.
4. Show rocks on either side of the fault plane moves horizontally in the
nearly opposite directions.

Notes to the Teacher

Provide extra copies of this activity for students’ use.

14 CO_Q2_Science 8_ Module 1
 Answer Key

Assessment What can I Do? What I have Learned

1. C 6. B 11. A Activity 5 1. a. normal

2. D 7. A 12. D 1. Cities A, B, and E b. reverse
c. strike slip
3. D 8. B 13. A 2. City D
2. Earthquake
4. B 9. C 14. A 3. Because City D is far from 3. Fault
any fault. There is no hazard
5. D 10. A 15. C of ground fissure which could
damage the foundation of the
house.

What’s More What’s More

Activity 4 Activity 3
1. Active 1. Cities A, B, and E
2. Cities C, E, and F
2. Inactive 3. City D
3. Inactive 4. The friction across the surface of the fault holds the
rocks together in order that they don't slip immediately
4. Active when pushed sideways. Eventually enough stress builds up
and thus sudden slip of the rocks, releasing energy in
waves that travel through the rock to cause the shaking
that we feel during earthquake.

Additional Activity What’s What’s New What I know

More
1. normal Activity 1 1. C 6. A 11. D
Activity 2
2. thrust 1. Reverse 2. B 7. A 12. B
1. B Fault
3. fault 3. A 8. C 13. B
2. C 2. Normal
4. strike slip 4. C 9. A 14. D
Fault
3. A
5. earthquake 5. D 10. B 15. C
3. Strike-slip
6. reverse Fault

7. friction

15 CO_Q2_Science 8_ Module 1
Reference

Department of Education, Science 8 Learner’s Module, First Edition 2013, Page 155.

16 CO_Q2_Science 8_ Module 1
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