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Earthquake Magnitude

Richter Scale

9.0 — Causes complete devastation and large-scale loss of life.

8.0 — Very few buildings stay up. Bridges fall down. Underground pipes burst. Railroad rails bend. Large rocks move. Smaller objects are tossed into the air. Some objects are swallowed up by the earth.

7.0 — It is hard to keep your balance. The ground cracks. Roads shake. Weak buildings fall down. Other buildings are badly damaged.

6.0 — Pictures can fall off walls. Furniture moves. In some buildings, walls may crack.

5.0 — If you are in a car, it may rock. Glasses and dishes may rattle. Windows may break.

4.0 — Buildings shake a little. It feels like a truck is passing by your house.
3.0 — You may notice this quake if you are sitting still, or upstairs in a house. A hanging object, like a model airplane, may swing.

2.0 — Trees sway. Small ponds ripple. Doors swing slowly. But you can't tell an earthquake is to blame.

1.0 — Earthquakes this small happen below ground. You can't feel them.

The Richter scale grows by powers of 10. An increase of 1 point means the strength of a quake is 10 time greater than the level before it. Here's how it works:

An earthquake registering 2.0 on the Richter scale is 10 times stronger than a quake registering 1.0. A quake registering 3.0 is 10 X 10 or 100 times stronger than a quake registering 1.0 A 4.0 is 10 X 10 X 10 or 1,000 times greater than 1.0 and so on.

B):

1.the earthquake measured ... on the Richter scale

The Seismology Research Centre says the earthquake measured 3.8 on the Richter scale with an epicenter about 80 kilometers south-west of Sydney.

2.earthquake measuring ... Richter scale

Earthquake measuring 7.8 Richter scale hits SW China.

3.Magnitude ... earthquake

A powerful magnitude-7.6 earthquake struck off the Solomon Islands on Monday.

4....-magnitude quake

The 7.9-magnitude quake

C)other

1.aftershocks

The quake struck at 2:28 p.m., 10 kilometers deep and 90 kilometers west-northwest of the central city of Chengdu, followed by aftershocks including a magnitude-6 quake 15 minutes later, the U.S. Geological Survey said.

Category :[Natural][Geological disasters]
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