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Japan earthquakes in the last 24 hours, including a 6.3 magnitude, following upon the 6.7 magnitude earthquake earlier this week.
Japan Earthquake last 24 h USGS
Some of the recent earthquakes:
M6.3 – 140km E of Miyako, Japan
2015-02-20 04:25:24 (UTC)
M5.3 – 50km SSE of Shizunai, Japan
2015-02-20 19:28:27 (UTC)
M4.5 – 188km E of Yamada, Japan
2015-02-20 09:46:23 (UTC)
M6.7 – 83km ENE of Miyako, Japan
2015-02-16 23:06:27 (UTC)
Earthquakes Japan over last 7 days (20 Feb. 2015 UTC) USGS
Earthquakes Japan last 7 days, USGS(see full listing below)
earthquake Japan week ending Feb. 20 2015 UTC, USGS, Nuclear sites: Jim Lee-ClimateViewer, CC-BY-NC-SA-4.0
Earthquakes Japan last 7 days, USGS; Nuclear sites-Tsunami wave or Fukushima leak from Jim Lee-ClimateViewer, CC-BY-NC-SA-4.0 [1]
USGS Japan earthquakes last 7 days, 20 Feb. 2015, list
USGS Japan earthquakes last 7 days, 20 Feb. 2015, list, p. 2
Clearly this is no place for nuclear reactors, unless one is a member of a death-doomsday cult! [2] Plus there are lots of volcanoes!
Japan earthquakes 1900-2012 USGS full map
Japan earthquakes 1900 to 2012 http://earthquake.usgs.gov/earthquakes/tectonic/images/japan_tsum.pdf
Tectonic Summary
Seismotectonics of Japan and Vicinity
Japan and the surrounding islands straddle four major tectonic plates: Pacific plate; North America plate; Eurasia plate; and Philippine Sea plate. The Pacific plate is subducted into the mantle, beneath Hokkaido and northern Honshu, along the eastern margin of the Okhotsk microplate, a proposed subdivision of the North America plate. Farther south, the Pacific plate is subducted beneath volcanic islands along the eastern margin of the Philippine Sea plate. This 2,200 km-long zone of subduction of the Pacific plate is responsible for the creation of the deep offshore Ogasawara and Japan trenches as well as parallel chains of islands and volcanoes, typical of Circumpacific island arcs. Similarly, the Philippine Sea plate is itself subducting under the Eurasia plate along a zone, extending from Taiwan to southern Honshu that comprises the Ryukyu Islands and the Nansei-Shoto trench.

Subduction zones at the Japanese island arcs are geologically complex and produce numerous earthquakes from multiple sources. Deformation of the overriding plates generates shallow crustal earthquakes, whereas slip at the interface of the plates generates interplate earthquakes that extend from near the base of the trench to depths of 40 to 60 km. At greater depths, Japanese arc earthquakes occur within the subducting Pacific and Philippine Sea plates and can reach depths of nearly 700 km. Since 1900, three great earthquakes occurred off Japan and three north of Hokkaido. They are the M8.4 1933 Sanriku-oki earthquake, the M8.3 2003 Tokachi-oki earthquake, the M9.0 2011 Tohoku earthquake, the M8.4 1958 Etorofu earthquake, the M8.5 1963 Kuril earthquake, and the M8.3 1994 Shikotan earthquake.http://earthquake.usgs.gov/earthquakes/eventpage/usc000trzp#general_summary

[1] Climate Viewer 3D KML Files by Jim Lee are licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. Based on works at http://climateviewer.com/3D/ and http://climateviewer.com/mobile/
(Jim Lee files based on work of Declan Butler)

[2] Nuclear Energy in Japan only makes sense from the vantage of a wacky dangerous doomsday cult: “Asahara outlined a doomsday prophecy,… He described a final conflict culminating in a nuclear “Armageddon”,…[11] Humanity would end, except for the elite few who joined Aum.[11] Aum’s mission was not only to spread the word of “salvation”, but also to survive these “End Times“. http://en.wikipedia.org/wiki/Aum_Shinrikyo