DRRR Geological Hazards a natural phenomenon Week 1.pptx

This is a week 1 topic of DRRR.

1. Geological Hazards natural phenomenon that causes devastating loss of life and property all over the world.

2. Cause of Geological Hazards disastrous geological hazards happen due to human induced activities like the expansion and development of cities of which are directly or indirectly committed by humans.

3. Geological Hazards that commonly strike the Philippines are: rain-induced landslides and sinkholes.

4. Landslide What is a LANDSLIDE? The word “landslides” describes a wide variety of processes that result in the downward and outward movement of slope-forming materials including rock, soil, artificial fill, or a combination of these. The materials may move by falling, toppling, sliding, spreading or flowing.

5. Landslides can be initiated in slopes already on the verge of movement by  rainfall, snowmelt, changes in water level, stream erosion, changes in ground water, earthquakes, volcanic activity, disturbance by human activities, or any combination of these factors.

6. According to PHIVOLCS – landslides frequently occur in the country because of its geologic and climatic factors.

7. GEOLOGIC FACTOR Topography of your area

8. CLIMATIC FACTOR Tropical Rainforest Climate Key characteristics of tropical rainforests Very wet with over 2,000 mm of rainfall per year. Very warm with an average daily temperature of 28°C. The temperature never drops below 20°C and rarely exceeds 35°C. The atmosphere is hot and humid . The climate is consistent all year round. There are no seasons.

9. Basic Types of Landslides

10. Basic Types of Landslides

11. Basic Types of Landslides

12. Basic Types of Landslides

13. Basic Types of Landslides

14. Make your own graphical representation of warning signs.

15. SINKHOLE What are sinkholes? A sinkhole is a depression or hole in the ground caused by some form of collapse of the surface layer. The ground caves in suddenly, creating large holes in the ground and sometimes devouring whole buildings. This type of geologic feature, sinkholes are common where the rock below the land surface is limestone, carbonate rock, salt beds, or rocks that can naturally be dissolved by groundwater circulating through them. As the rock dissolves, spaces and caverns develop underground backyard.

16. There are two categories of sinkholes: “induced” and “natural”.

17. Scientific reasons for the appearance of Sinkholes Natural causes of sinkholes: The type of soil / rock giving way to rainwater and underground water. meteorite strikes, heavy rainfall, global warming, underground gas explosions, etc. Artificial causes of sinkholes: mining activity. They can also occur from the over-pumping and extraction of groundwater and subsurface fluids.

18. Most Common Types of Sinkholes

19. Most Common Types of Sinkholes

20. Most Common Types of Sinkholes

21. Warning Signs of Sinkholes

22. Make your own graphical representation of warning signs.

23. In a ¼ sheet of paper answer the following:

24. Answers: 1. Creep 2. Spreads 3. Topple 4. Earth Flow 5. Slide