about 8.9 was the first one
the rector scale is used to measure earthquakes. 1 - 4 you can't feel. 5 is a slight tremor. that x 10 is 6, x 10 is 7, so on.
=Mount Etna had an average of 6.8 on the rector scale.=
Japan uses the Richter scale to measure earthquakes. This scale quantifies the energy released by an earthquake using a logarithmic scale from 1 to 10. In addition to the Richter scale, Japan also uses the Japan Meteorological Agency (JMA) seismic intensity scale to evaluate the intensity of shaking felt at specific locations.
On the rector scale it was 8.8.It was then upgraded to 8.9,and lastly it was upgraded to 9.0 bringing the death toll to more then 21,000 in Japan.
Scientist estimate it at 7.9 on the Rector scale. In 1906 there really was no way to measure how strong an earthquake was.
Chile and haiti Japan had the last major earthquake heard about worldwide. But earthquakes happen every second all over the earth. Some arent strong enough to feel or even make the scale, while others are major ones, like the earthquake in Japan.
I suspect that you mean the "Richter scale." I am not familiar with the "rector scale." The Richter scale is a method to describe the amount of energy released by an earthquake as recorded at a specific location. Since the release of energy covers a very wide range of values, the scale is logarithmic, meaning that for every increase in a whole number, the energy is ten times greater. Thus an earthquake registering 5 on the Richter scale is ten times more powerful than an earthquake registering 4 on the Richter scale.
9.1 on the Richter Scale.
If you mean 'Richter Scale' then it is a system used to measure how strong earthquakes are. Eg. The recent Haiti Earthquake measured 7.0 on the scale.
Strong ones at or above 6 on the earthquake scale. Earthquakes centered close to human connerbations. Earthquakes that cause Tsunamis.
Japan experiences frequent earthquakes ranging in magnitudes from small to very large. The average Richter scale reading for Japan can vary depending on the time frame and specific regions considered, but is generally around 4-5 on the Richter scale.
Because the island of Japan lies in an area where several plates meet, it has experienced frequent earthquakes. Earthquakes are caused by the release of energy or seismic waves when these plates move. See the related links below for a list of earthquakes that have hit Japan in the past. The most recent earthquake and biggest to ever hit Japan occured March 11, 2011 and measured 8.9 on the Richter scale.