Unit4Earthquake.ppt

1、April 14,2010,Qinghai Earthquake,May 12,2008,Wenchuan Earthequake, in Sichuan Province, China,There is still hope Life is strong,Earthquakes,Tang Shans New Look:,34years ago：,The Seismographs(地震仪）,Its not always calm before a storm.,There are bright lights in the sky.,The well has deep cracks in it,

2、and the water in it rises and falls . A smelly gas came out of the cracks.,Chickens are flying and dogs are barking ,and pigs and cows are too nervous to eat.,Fish jump out of the pond,and mice run widely out of the fields.,Tangshan Earthquake:,It struck at 3:42 am on July 28,1976. 8.2 Richter scale

3、 (the size of an earthquake 里氏震级 ) 242,419 people were killed,and 164,581people were severely injured. Economic damage estimated at 3 billion yuan .,Here is the Richter scale:,Less than 3.5: quake recorded but not felt 3.5-5.4: usually felt but rarely any damage 5.5-6.0: little damage to strong buil

4、dings;big damage to weak buildings 6.1-6.9: some damage within 100km 7.0-7.9: big damage over a large area 8.0-larger: terrible damage over huge area,The reason for so many injuries:,People in Tangshan had not been prepared when such an earthquake occurred. The earthquake struck at night when most p

5、eople were in bed. It was extremely powerful earthquake that its effects can be felt in Beijing which is 200km away.,Question:,Have you ever thought of the causes of earthquake?,plate tectonics :板块运动,Scientist believe that the surface of the earth is covered by a number of moving plates. Sometimes t

6、wo plates move towards and push again at each other ,and at this moment, the earthquake happen.,What shall we do if the classroom begins to shake?,Discussion :,How to survive in an earthquake?,Indoors,Outdoors,hide under some strong furniture or by the furniture hide in the corner of the house Dont

7、jump out of the building,drop onto the ground and cover your head keep away from the buildings and the the sighs and keep away from the power lines,make sure your family and neighbors are safe,after you confirm your family is safety ,check if your neighbors are all right. Work with your neighbors to free victims from under debirs or fallen furniture and to give first