2008-05-18

Earthquake Richter Scale Japanese Scale of Intensity

In Japan (and Taiwan), earthquakes are measured in units intensity, or shindo (震度). Shindo indicates the strength of earthquakes or literally the degree of shaking. The shindo scale is determined by the Japan Meteorological Agency (JMA--English / Japanese). A detailed description of the JMA shindo scale can be found at Wikipedia (English / Japanese).

The shindo scale provides a number that tells the public how an earthquake affected their immediate area. Of course, such information would be very helpful before an earthquake occurs. However, technology is not advanced enough yet. So, for now, the shindo scale can only tell us how sever an earthquake was only after it has occurred. In reality, such information is useless to people who have suffered the earthquake itself. If a shindo scale earthquake of 6 or 7 arrived in my area, I would know it before the JMA announced such information on TV or the radio. So, I guess such information would only be valuable to my friends, relatives, and emergency personnel.

In the rest of the world, the Richter scale is used. This includes news sites reporting on the recent earthquake in China.

For example:

The Hindu
Quakes between 5-5.9 on the Richter scale numbered 20, while quakes between 6-6.9 on the Richter scale numbered 3.
Reuters
At least 8,500 people were killed in Sichuan province alone after the 7.8 magnitude earthquake hit the region.
CNN
China's Xinhua news agency reported Wednesday that the death toll from the quake - which measured 7.9 on the Richter scale - had risen to 14,866.
BBC
Around 400 people die when an earthquake measuring 7.2 on the Richter scale strikes Ducze, in north-west Turkey.
Nikkei News Interactive
The magnitude 7.2 quake struck at 6:33 a.m. in the area of the Xinjiang Uygur Autonomous Region's border with the Tibet Autonomous Region, and was followed by two strong aftershocks -- registering M5.3 and M5.5 -- within an hour, the USGS said on its website.
So, the next time you discuss the intensity of an earthquake with non-Japanese, you might want to explain the JMA shindo scale, or check the Internet and find the Richter scale number for the earthquake. The U.S. Geological Survey monitors earthquakes all over the world, so you can visit their website for the latest info in English.

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