英语口语_地震_自然灾害_earthquake_and_naturaldisastersPPT课件

Views of Japan’s earthquake
According to latest news, Japan’s earthquake has caused 9523 people death and 16067 people missed.
A total of 363,000 victims lost their homes
2
There are smaller earthquakes that happen in the same place as the larger earthquake
that follows.
3
Scientists can’t tell that an earthquake is a foreshock until the larger earthquake
The Origin of Earthquake:
Earthquakes happen because the outer layer of the earth (the crust) is slowly being deformed by stresses that are placed on the crust. These stresses build up along locked portions of the crust where earthquake faults( 断 层 ) are. Eventually the stresses become too great for one of the faults to withstand( 承 受 ), and the crust suddenly moves, like a spring that has been wound too tightly. This sudden movement of the ground is called an earthquake.
down
cause power line failures
cause loss of life and property
trigger landslides,flooding and tsunamis
may cause infective deseases
Signs
happen before an
happens.
Earthquakes with magnitude 3 or lower are mostly not awared ( we may not feel it), but earthquakes with magnitude 7 can cause serious damage over large areas.
Natural disasters
-----Earth’s crying
As we all know, Japan was hit by an earthquake ,magnitude 9.0 at around 2:46pm 3.11.2011. This is the biggest earthquake I have ever heard so far in my life.
And what can be caused by the earthquake?
Have you ever seen earthquakes happening around you?
What may happen before an earthquake?
Do you know how to surivive in an earthquake?
How much do you know about an earthquake?
Many people died…… People lost their homes…. Many things were destroyed…..
Do you know what is the Earthquake?
earthquake?
1) The weather will become worse than usual. There will be strong wind, heavy rain and bright light in the sky and so on.
2) Animals will become nervous. e.g. mice will run about; fish jump out of ponds; cows, pigs, horses and dogs will be upset.
What’s earthquake
?
1
An earthquake is the result of a sudden release of energy in the Earth's crust that
creates seismic waves（地震波）.
Sometimes an earthquake has foreshocks.
earthquake hazard（地震危害 性EaBaidu Nhomakorabea）thquakes are among the most powerful
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Even worse, nuclear power plants had experienced breakdowns in their cooling systems as a result of the earthquake, and small amounts of radiation leaked from the both plants.