The Kingdome in Seattle was destroyed on March 26, 2000. It was taken down to make room for a new stadium. The blast(爆破) from the falling building caused the earth to shake as if an earthquake had happened.

Scientists placed more than 200 earthquake recorders in the earth to measure the movement. They found which parts of the city shook the most. This information helped them know which parts of the city would be damaged in a real earthquake at an early time.

A real earthquake happened on February 28, 2001 in Seattle. The Nisqually earthquake was 6.8 on the Richter scale(里氏6.8级). It damaged the same parts of Seattle that scientists had predicted(预测) from the pulling down of the Kingdome. It was a plate quake. It started deep in the earth, 37 miles below the surface on the Juan de Fuca Plate. Sometimes, huge plates under the earth cause earthquakes when the plates move against each other suddenly.

Scientists have learned that deep earthquakes have very few aftershocks(余震). The Nisqually earthquake had only 4 ones. Another earthquake in California that was close to the surface had over 120 aftershocks. Scientists do not know why the deep earthquakes have fewer aftershocks.

Scientists plan to blast in the ground near Seattle with the purpose of testing the plate. The shockwaves from the blast will jump off the plate and give them an idea of where the plate is and how it is moving. This will give them more information in case another real earthquake hits the area.

1. According to the passage, ______ have the most aftershocks.

   A. shockwave earthquakes

   B. shallow earthquakes

   C. deep earthquakes

D. earthquakes more than 6.8 Richter scale

2. What do scientists hope to learn from the blast above the Juan de Fuca Plate?

   A. They hope to learn where the plate is and how it is moving.

   B. They want to destroy the Kingdome.

   C. They want to know which places are likely to have the most damage.

   D. They hope to find out how many plates there are in the ground there.

3. Why were the scientists interested in the pulling down of the Seattle Kingdome?

  A. They wanted to see which areas near the Kingdome would shake the hardest.

  B. They wanted to predict what might happen in a real earthquake.

  C. They wanted to measure the movement of the Earth with earthquake recorders.

  D. All of the above.

4. What will happen after a deep earthquake according to the scientists?

   A. There will be many aftershocks.

   B. There will be very few aftershocks.

   C. The Richter scale of the quakes will be a 6.8 or more.

D. There will be little damage.

 

 0  39705  39713  39719  39723  39729  39731  39735  39741  39743  39749  39755  39759  39761  39765  39771  39773  39779  39783  39785  39789  39791  39795  39797  39799  39800  39801  39803  39804  39805  39807  39809  39813  39815  39819  39821  39825  39831  39833  39839  39843  39845  39849  39855  39861  39863  39869  39873  39875  39881  39885  39891  39899  151629 

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网