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1. SCIENCE 7
fourth QUARTER
LC 3 - WEEK 2
Matatag curriculum
Earthquake Effects
on Communities

2. Earthquake Effects on
Communities
CONTENT
The learners learn that the damage or effects on
communities depend on the magnitude of and
distance from an earthquake.
LEARNING
STANDARD
The learners will describe how the effects of
earthquakes on communities depend on their
Magnitude.
LEARNING
COMPETENCY

3. By the end of the lesson, the 80 percent of the
learners will be able to:
1. Describe the effects of earthquake.
2. Identify the relationship between earthquake
magnitude and its effects on communities.
3. Appreciate the importance of earthquake
preparedness and mitigation efforts in reducing
the impacts on communities by answering the
reflection of learning.
OBJECTIVES

4. I. Activating Prior Knowledge
Short Review
Play the news about the magnitude 7.4 earthquake that
happened in Surigao Del Sur last December 2, 2023. Video
link:https://www.youtube.com/watch?v=3_x4gICJOXI&t=1s
I. Activating Prior Knowledge

5. I. Activating Prior Knowledge
Short Review
Play the news about the magnitude 7.4 earthquake that
happened in Surigao Del Sur last December 2, 2023. Video
link:https://www.youtube.com/watch?v=3_x4gICJOXI&t=1s
I. Activating Prior Knowledge
After watching the video clip, ask the learners the following questions:
 What did you observe in the video?
 Who among you have experienced an
earthquake?
 What are the things that can happen during an
earthquake?
 Are you familiar with the fault lines in the
Philippines?

6. 1. Describe the effects of earthquake.
2. Identify the relationship between earthquake
magnitude and its effects on communities.
3. Appreciate the importance of earthquake
preparedness and mitigation efforts in reducing
the impacts on communities by answering the
reflection of learning.
B. Establishing Purpose of the Lesson
1. LESSON PURPOSE

7. B. Establishing Purpose of the Lesson
2. Unlocking Content Vocabulary: Match Type Activity
EPICENTER
MAGNITUDE
INTENSITY
The point on the Earth's surface that is directly
above the focus.
Earthquake magnitude is a measure of the“size,”
or amplitude, of the seismic waves generated by
an earthquake source and recorded by
seismographs
It is a measure of the strength of shaking
experienced in an earthquake.
FOCUS The point within Earth where rock under stress
breaks, resulting in an earthquake.

8. C. Developing and Deepening Understanding
What is an Earthquake?
An earthquake is a sudden and violent shaking of the
ground, caused by the abrupt movement of large sections
of the Earth's crust, known as tectonic plates. These plates
are constantly in motion, and when they grind, collide, or
pull apart, the resulting stress and pressure can cause the
ground to shake violently.

9. C. Developing and Deepening Understanding
Earthquake Effects on
Communities
Earthquakes are powerful natural
disasters that can have devastating
effects on communities. The extent of
damage depends on the
earthquake's magnitude, proximity to
populated areas, and the
community's infrastructure and
preparedness.

10. C. Developing and Deepening Understanding
Magnitude Scales:
Richter, Moment, and Energy
Richter Scale
The Richter scale
measures the amplitude
of seismic waves
recorded on a
seismograph. It is a
logarithmic scale,
meaning that each whole
number increase
represents a tenfold
increase in wave
Moment
Magnitude Scale
The moment magnitude
scale (Mw) is based on
the amount of energy
released by the
earthquake, calculated
from the area of the
fault rupture and the
amount of slip along the
fault.
Energy Scale
The energy scale
measures the total
amount of energy
released by an
earthquake, expressed
in joules. It is a more
precise measure of the
energy released by an
earthquake than the
Richter scale.

11. C. Developing and Deepening Understanding
Ground Shaking: Frequency,
Amplitude, and Duration
Frequency
The frequency of ground
shaking refers to the
number of vibrations per
second, which can affect
the type of damage to
structures.
Amplitude
The amplitude of ground
shaking is the maximum
displacement of the
ground during the
earthquake, determining
the severity of the
shaking.
Duration
The duration of ground shaking is the length of time that
the ground vibrates, which can also contribute to damage.

12. C. Developing and Deepening Understanding
Surface Faulting and
Ground Deformation
Fault Ruptures
Earthquakes often cause
the ground to break
along existing fault lines,
resulting in visible cracks
and displacement of the
earth's surface.
Ground Deformation
Ground deformation can
also occur during
earthquakes, leading to
changes in elevation and
the shape of the land.

13. C. Developing and Deepening Understanding
Liquefaction and Soil
Failures
1 Liquefaction
Liquefaction occurs when saturated, loose
soil loses its strength and behaves like a
fluid under the pressure of seismic waves.
2 Soil Failures
Soil failures can occur as a result of
liquefaction or other ground shaking,
leading to landslides, slope instability, and
damage to foundations.

14. C. Developing and Deepening Understanding
Landslides and Slope Instability
1 Slope Failure
2
Landslides
Earthquakes can destabilize slopes, leading to
landslides, which can cause significant damage to
buildings, roads, and infrastructure.
3
Rockfalls
Rockfalls are also common during
earthquakes, as seismic waves can
dislodge rocks from cliffs and slopes,
posing a danger to people and property.

15. C. Developing and Deepening Understanding
Tsunamis and Coastal Impacts
1
Tsunamis
Tsunamis are giant waves caused by the displacement of a large
volume of water, often triggered by undersea earthquakes.
2
Coastal Impacts
Tsunamis can cause widespread
damage to coastal areas, inundating
land, destroying infrastructure, and
causing casualties.

16. C. Developing and Deepening Understanding
Earthquake Resilience and
Mitigation Strategies
1
Building Codes
Stringent building codes help
ensure that structures are
designed and built to withstand
seismic forces.
2
Early Warning Systems
Early warning systems provide
valuable time to prepare for an
earthquake, potentially saving
lives and reducing damage.
3
Emergency Response Plans
Well-developed emergency
response plans ensure
coordinated and effective action
during and after an earthquake.

17. C. Developing and Deepening Understanding
Key Takeaways and Implications
Earthquakes are a significant risk, but communities can
mitigate their impact through effective planning,
infrastructure investments, and education. Understanding
the science behind earthquakes and their effects is crucial
for building resilient communities.

18. C. Developing and Deepening Understanding
C. Developing and Deepening Understanding
WORKED EXAMPLE
Assessing Earthquake Risk in Our Community
Objective(s): At the end of the activity, you should
be able to use the Fault Finder app to identify
where the nearest fault system is and assess the
risk of earthquakes to your local community
Materials Needed: gadget with internet access,
access to Fault Finder

19. C. Developing and Deepening Understanding
C. Developing and Deepening Understanding
WORKED EXAMPLE
Assessing Earthquake Risk in Our Community
Instructions:
1. Use your gadget to access the Fault Finder app
developed by DOST then fill in the table with the
needed data, and answer the questions that follow.
Your Location: ___________________________________________
Nearest Active Fault Trace: __________________________________
Fault Name: ______________________________________________
Segment Name: ___________________________________________
Year Mapped: ____________________________________________

20. C. Developing and Deepening Understanding
C. Developing and Deepening Understanding
WORKED EXAMPLE
Assessing Earthquake Risk in Our Community
Guide Questions:
1. When is the most recent record of an
earthquake in your community?
2. Does your community have old buildings?
3. Does your community have a big population in
one area? Do you think your community is
prepared for an earthquake? Why? Why not?

21. C. Developing and Deepening Understanding
C. Developing and Deepening Understanding
WORKED EXAMPLE
Assessing Earthquake Risk in Our Community

22. C. Developing and Deepening Understanding
C. Developing and Deepening Understanding
WORKED EXAMPLE
World’s Historical Earthquake
To further reinforce the concepts learned, students can
conduct additional research on specific earthquakes from
history, including their location, date, magnitude, and
significant impacts (e.g., the San Francisco earthquake of
1906, the Japan earthquake and tsunami of 2011) and
analyze how tectonic plate movements contributed to
these events. You may use the template below for your
answer.

23. C. Developing and Deepening Understanding
C. Developing and Deepening Understanding
WORKED EXAMPLE

24. C. Developing and Deepening Understanding
C. Developing and Deepening Understanding
LESSON ACTIVITY
Picture analysis. The learners will analyze the pictures and answer
the processing questions.
Huge boulders block a highway at
Cortes township, Bohol on October
16, 2013, a day after a 7.2
magnitude quake struck
The Philippine Institute of
Volcanology and Seismology
(Phivolcs) traced the epicenter of
the earthquake 6 kilometers
southwest of Sagbayan, Bohol.

25. C. Developing and Deepening Understanding
C. Developing and Deepening Understanding
LESSON ACTIVITY
Picture analysis. The learners will analyze the pictures and answer
the processing questions.
A view of a portion of a
damaged highway in
Getafe, Bohol, central
Philippines, on October
16, 2013

26. C. Developing and Deepening Understanding
C. Developing and Deepening Understanding
LESSON ACTIVITY
Picture analysis. The learners will analyze the pictures and answer
the processing questions.
A strong undersea
earthquake
struck off the southern
Philippines on
Saturday, 29 December,
2018.

27. C. Developing and Deepening Understanding
C. Developing and Deepening Understanding
LESSON ACTIVITY
Process Questions:
What are the possible risks brought by an earthquake?
Is an earthquake's magnitude connected to the amount
of damage it causes in a location?
Will the distance from the epicenter affect the damage
that it may cause?
How would the economy of the area be affected if the
roads were destroyed, as seen in the picture?

28. D. MAKING GENERALIZATION
Learners’ Takeaways
KWL Chart: Using the
graphic organizer, the
students will answer the
L column or what
they have learned about
the lesson.
D. MAKING GENERALIZATION

29. D. MAKING GENERALIZATION
Reflection on Learning
Why is it important to know the locations of safe
spaces during earthquakes in the Philippines?
What are the potential consequences of not
recognizing safe locations during an earthquake in
the Philippines?

30. E. EVALUATING LEARNING
E. EVALUATING LEARNING
E. EVALUATING LEARNING
_________ 1. Which of the following is a
key factor that determines the severity of
ground shaking during an earthquake?
a) Frequency of the seismic waves
b) Amplitude of the seismic waves
c) Duration of the ground shaking
d) All of the above

31. E. EVALUATING LEARNING
E. EVALUATING LEARNING
E. EVALUATING LEARNING
_________ 2. Surface faulting during an
earthquake can lead to:
a) Damage to buildings and infrastructure
b) Disruption of transportation routes
c) Changes in topography and drainage
patterns
d) All of the above

32. E. EVALUATING LEARNING
E. EVALUATING LEARNING
E. EVALUATING LEARNING
_________ 3. Liquefaction is most likely to
occur in soils that are:
a) Loose, water-saturated sands or silts
b) Dry, compacted clays
c) Shallow bedrock
d) None of the above

33. E. EVALUATING LEARNING
E. EVALUATING LEARNING
E. EVALUATING LEARNING
_________ 4. Which of these is a common
trigger for earthquake-induced landslides?
a) Ground shaking
b) Surface faulting
c) Soil liquefaction
d) All of the above

34. E. EVALUATING LEARNING
E. EVALUATING LEARNING
E. EVALUATING LEARNING
_________ 5. Tsunamis generated by
offshore earthquakes pose the greatest risk
to:
a) Inland communities
b) Coastal communities
c) Mountain communities
d) Desert communities

35. E. EVALUATING LEARNING
E. EVALUATING LEARNING
E. EVALUATING LEARNING
_________6. Which of the following is a key
strategy for improving earthquake
resilience in communities?
a) Strict building codes and enforcement
b) Comprehensive disaster planning and
preparedness
c) Investing in infrastructure upgrades
d) All of the above

36. E. EVALUATING LEARNING
E. EVALUATING LEARNING
E. EVALUATING LEARNING
_________7. The magnitude of an
earthquake refers to:
a) The frequency of the seismic waves
b) The amplitude of the seismic waves
c) The total energy released by the
earthquake
d) The duration of the ground shaking

37. E. EVALUATING LEARNING
E. EVALUATING LEARNING
E. EVALUATING LEARNING
_________8. Surface deformation during an
earthquake can lead to:
a) Damage to underground pipelines and
cables
b) Changes in surface water drainage
c) Disruption of transportation routes
d) All of the above

38. E. EVALUATING LEARNING
E. EVALUATING LEARNING
E. EVALUATING LEARNING
_________9. Soil liquefaction is most
likely to occur in areas with:
a) Steep slopes
b) High water tables
c) Shallow bedrock
d) None of the above

39. E. EVALUATING LEARNING
E. EVALUATING LEARNING
E. EVALUATING LEARNING
_________10. Earthquake-triggered
landslides are a particular risk for
communities located:
a) Near coastlines
b) In mountainous regions
c) On reclaimed land
d) All of the above

40. E. EVALUATING LEARNING
E. EVALUATING LEARNING
E. EVALUATING LEARNING
1. d) All of the above
2. d) All of the above
3. a) Loose, water-saturated sands or silts
4. d) All of the above
5. b) Coastal communities
6. d) All of the above
7. c) The total energy released by the earthquake
8. d) All of the above
9. b) High water tables
10. d) All of the above.
ANSWERS KEY

41. Reference :
•SCIENCE 7 LESSON EXEMPLAR
● United States Geological Survey (USGS). (n.d.).
Magnitude, intensity, and earthquake effects. In
Earthquake Hazards Program. Retrieved from
https://pubs.usgs.gov/gip/earthq3/magnitude.html
● Gomez, J., & Gomez, J. (2018, December 29).
Tsunami alert in Philippines lifted hours after
undersea quake. TheQuint.
https://www.thequint.com/news/world/tsunami-