2.2 Questions- Landslides, Earthquakes and Tsunamis

1. Landslides involve the movement of a mass of rock or sections of the Earth's crust under the force of gravity.


2. Human actions usually cause a landslide but also heavy rainfall or undercutting of banks and cliffs from rivers.


3. They can build cities on the side of mountains. De vegetation and construction or roads and railways.


4.  An earthquake is an intra-plate tension where movements occur along cracks and faults in the Earth's crust. They are measured by a Richter scale.


5. They are mainly caused by the tectonic plates rubbing across each other underneath Australia.


6. Every 15 months, because we have created buildings  that are earthquake ready.


7. 35000 homes and 3000 other buildings being moderately impacted and 13 people were killed and 120 people were injured.


8. A landslide is usually caused by weather and are very small compared to earthquakes which can go for kilometres and are caused by the tectonic plates.


9. A tsunami is a wave caused by the movement of the Earth's crust.


10. Earthquakes, landslide or volcanoes.


11. When movement of the ocean floor occurs it creates a major ripple in the ocean causing the water to move. When the tsunami  reaches a beach or shallow water the water recedes before


12. Sudden retreat of water, feeling of earthquake and roar of the water coming.


13. An under sea earthquake.


14. 23. 20 minutes


15. The tsunami grows as it reaches shallow water and creates a growing sound.


16. The coordinated the development of a tsunamis warning system.


17. He is a geoscience professor. He says that the Alpine Fault hits NSW ever 500 years and could reach up to Parramatta. 


18. a) 10N, 100E
b) i. 3 hours
ii. 10 hours
iii. 5 hours
iv. 10 hours


19. At 11:35pm on Wednesday, 30 July a landslide consisting of 2000 cubic meters mud and rock moved rapidly down Alpine Way. The landslide was devastating, taking with it Carinya Ski Lodge, then passing through Bobuck Lane slamming into an elevated car park and then plummeting directly into Bimbadeen Lodge. With 18 precious lives lost the town of Thredbo was deeply saddened and many of the lives lost were locals or the town not just tourists.
Much of the local environment, especially the ski lodges, car park and many shops were destroyed when the landslide hit and it took many days for all of the debris to be cleaned.