These are some figures from the Japan Meteorological Agency showing more about the earthquake hazard for southern Japan. This figure shows the sources of earthquakes back to 1605.
Image source:
Japan Meteorological Agency (2009). Earthquakes and Tsunamis Disaster Prevention, http:/www.jma.go.jp/jma/en/Activities/brochure_earthquake_and_tsunami200903.pdf, accessed March 2010, 28 pages.
This is also a very good brochure to look at for a summary of information that the Japan Meteorological Agency provides to the general public.
