If it breaks as a unit, he said, the earthquake would measure 9.5 or above.

One earthquake in 1966 measured 7.5 on the Richter scale.

The earthquake measured 7.8 on the surface wave magnitude scale and killed more than 20,000 people.

The other two large earthquakes that hit within 18 hours of the first shock, measured magnitude 6.5 and 6.7.

Moderate earthquakes measure less than 6.0 or so on the Richter scale.

An earthquake measuring 6 is capable of causing severe damage.

The earthquake measured 7.0 on the moment magnitude scale.

The earthquake, measuring a 6.1 on the Richter scale, did not cause a tsunami.

A strong earthquake measuring 6.7 on the moment magnitude scale hits Greece at 13:34.

Therefore, an earthquake measuring 6.0 is about 30 times more powerful than one measuring 5.0.