Earthquakes Japan 2011

This is an overview of all the earthquakes in Japan in 2011, sorted per magnitude and shindo (震度, shaking intensity). This data was generated by using the Japan Meteorological Agency database.

The most earthquakes in a single category were shindo 1 and magnitude 3-3.9, nearly ten times more than last year.

Shindo 1 earthquakes ranged from magnitude 0 to 6.9.

Shindo 2 earthquakes ranged from magnitude 1 to 6.9.

Shindo 3 earthquakes ranged from magnitude 2 to 6.9.

Shindo 4 earthquakes ranged from magnitude 2 to 7.9.

Shindo 5- earthquakes ranged from magnitude 3 to 7.9.

Shindo 5+ earthquakes ranged from magnitude 4 to 6.9.

Shindo 6- earthquakes ranged from magnitude 5 to 7.9.

Shindo 6+ earthquakes ranged from magnitude 6 to 7.9.

The Shindo 7 earthquake was magnitude 9.0.

Below the frequency distribution of earthquakes during the year is shown:

Comparing the JMA statistics with the data from their database, 73 earthquakes were missing from the data in the database (44 of shindo 1, six of shindo 2, and one of shindo 3).

JMA:

Intensity	震度７	震度６強	震度６弱	震度５強	震度５弱	震度４	震度３	震度２	震度１	Total
2011	1	4	4	17	45	253	976	2863	6518	10681

Database:

Intensity	震度７	震度６強	震度６弱	震度５強	震度５弱	震度４	震度３	震度２	震度１	Total
2011	1	4	4	17	45	253	975	2857	6452	10608