1. A hazard is defined as a potentially damaging physical event, phenomenon, or human activity that can cause loss of life, injury, property damage, or environmental disruption. 2. Hazards are classified as natural, secondary, technological, or quasi-natural. Natural hazards result from earth's natural processes, while technological hazards result from human activities. Secondary hazards are consequences of other hazards, and quasi-natural hazards result from interactions between natural processes and human activities. 3. Examples of hazard types include geologic, hydrologic, atmospheric, biologic, and man-made hazards. Geologic hazards include earthquakes and volcanoes. Hydrologic hazards include floods and drought. Atmospheric hazards include typhoons, tornado

1. Basic Concept
of Hazards

2. Learning Objectives:
1. Understand the definition of hazard;
2. Enumerate the classification and types of hazards and its examples;
3. Appreciate the importance of Occupational Health and Safety

3. HAZARD
The United Nations International Strategy for
Disaster Reduction or UNISDR 2004 defines hazard
as “ A potentially damaging physical event,
phenomenon or human activity that may cause the
loss of life or injury, property damage, social and
economic disruption or environmental degradation.

4. Classifications of
HAZARD
1. Natural hazards - results from earth’s natural processes.
1. Secondary hazards - consequences of other hazards.
1. Technological hazards - products of human activities.
1. Quasi-natural hazard - results from the interaction of natural
processes and human activities (smog, desertification)

5. Types of Hazards
Geologic Hydrologic Atmospheric Biologic Man-made
Earthquakes,
Volcanic
eruptions,
Landslides,
Sinkhole
Formation
Floods,
Drought,
Rapid
Glacier
Advance
Typhoons,
Thunderstorm
s Tornadoes,
Snowstorm,
Hail, Blizzards,
Extreme
Temperatures
Epidemic
in humans,
plants,
animals
Locusts
Transport
accidents,
industrial
explosions/fires,
Accidental
release of toxic
materials,
nuclear
accidents, war,
computer virus

6. Things to Ponder
Why do you think it is significant to know the Basic
Occupational Health Safety?
Occupational Safety and Health
(OSH) deals with all aspects of
health and safety in the workplace
and has a strong focus on primary
prevention of hazards. Its goal is to
prevent accidents and harm to people
from work-related activities.

7. Let’s Practice! (F2F Quiz 3)
Direction: Identify the following, in letter a if hazard or a
natural phenomenon, in letter b what classification of
hazard and in letter c if what type of hazard.
1. An earthquake happened in an isolated place with no population.
2. A tsunami occurred after an earthquake happened and reached the
community.
3. An oil spill happened in Laguna de Bay.
4. Avian flu affects the poultry industry.
5. Typhoon Ondoy affected Metro Manila on September, 2009.