1、Unit 4EarthquakeWarming up必修一必修一fireNatural Disastersfloodtyphoonsnow slide(雪崩雪崩)volcano(火山火山)mudflowsandstormTsunami(海啸）海啸）earthquakeOn May 12th,200814:28A big earthquake happenedin WenChuan Sichuan!Many people believe that“it is always calm before a storm,”look carefully at the two photos.Now,imag
2、ine there has been a big earthquake.Describe what might happen to the objects in the photos.Warming upTangshanSan FranciscoSay something about these two cities.What will happen before an earthquake?Tangshan1.Where does the city of Tangshan lie?2.Have you ever heard of the earthquake in Tangshan?3.Do
3、 you know when the earthquake happened?4.The Tangshan earthquake is really a great disaster to the human being and it almost destroyed the whole city.Do you know how many people were injured and how many died in this accident?The Tangshan Earthquake also known as the Great Tangshan Earthquake,was a
4、natural disaster that occurred on July 28,1976.It is believed to be the largest earthquake of the 20th century by death toll.The epicenter of the earthquake was near Tangshan in Hebei,an industrial city with approximately one million inhabitants.The number of deaths initially reported by the governm
5、ent was 655,000,but has since stated the number to be around 240,000 to 255,000.A further 164,000 people were recorded as being severely injured.The earthquake hit in the early morning,at 03:42:53.8 local time,and lasted for around 10 seconds.Chinese Governments official sources state 7.8 on the Ric
6、hter magnitude scale3,though some sources listed it as high as 8.2.It was followed by a major 7.8 magnitude aftershock some 16 hours later,increasing the death toll.A great part of the city was destroyed and a large number of buildings were burnt.The number of people who lost homes reached as many a
7、s 250,000.About 700 people died in the earthquake and the fires.San FranciscoSan FranciscoSan Francisco lies in northern California and is surrounded on three sides by water.At 5:13 on the morning of April 18th,1906,the city was shaken by a terrible earthquake.A great part of the city was destroyed
8、and a large number of buildings were burnt.The number of people who lost homes reached as many as 250,000.About 700 people died in the earthquake and the fires.Imagine that last night,something terrible happened to the city:it was an earthquake.A big and terrible earthquake.When you look at the city
9、 after the earthquake,what can you see there?Tall buildings were destroyed.Roads were cracked.People were injured.The city was in ruins.San Francisco is a city with tall buildings thickly standing on the earth.These two cities are famous for their earthquakes during a period of calm.So one should not trust situations that seem peaceful since bad things may happen.Tangshan is a beautiful city with gardens,wide roads.
