15 quakes between 4.3 and 5.6 off the eastern coast of western Japan, some near Fukushima, in past 30 days.

Source: USGS, http://www.usgs.gov/ and from there to the USGS’ Latest Earthquakes page: http://earthquake.usgs.gov/earthquakes/map/, which brings you to this overview … of the 320 earthquakes in the world this past week.  A little higher than average, I think. Between 150 and 250 earthquakes of over 2.5 magnitude per week worldwide has been normal for as long as I’ve been watching this site over the years, but it isn’t unusual either.  I recall after Fukushima there were well over 500 quakes/week for some time.  Here’s a November 2, 2012 screenshot:

From there you can zoom in to the area surrounding and off the coast of Western Japan, where the crippled and radiation-leaking nuclear nightmare continues to unfold on the coast of the Fukushima Prefecture.  Screenshot of November 2, 2012, with settings for showing earthquakes in the past 30 days:

Screenshot of zoom-in on part of Japan on Nov 2, 2012
Earthquakes shown for past 30 days.

As you can see, there were 15 quakes in this past month, not unusual for this extremely active seimic region.  They all ranged in magnitude from 4.3 to 5.6 on the Richter Scale.  A 5.6, the strongest quake I have personally felt at its epicenter (several years ago in Northern California) is already a darn strong shaking.  The most recent one, a 4.9 was just 40 miles from the troubled Fukushima Daiichi nuclear power plant.  A quake 7.0 or up, or perhaps even as low as a 6.0, could send things from bad to worse, some have calculated, estimated or speculated.  Screenshot to with I added the location of the Fukushima-Daiichi nuclear power disaster site:

The epicenter of this Nov 2, 2012 quake, a 4.9 on the Richter Scale, was just 40 miles from the troubled nuclear power plants.
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