Dozen M4 quakes and above hit Eastern Japan since Thursday — Four at intensity 4 of 7 on JMA scale

Published: November 24th, 2012 at 2:39 pm ET


Title: Earthquake Information
Source:  Japan Meteorological Agency

Chiba quake

Published: November 24th, 2012 at 2:39 pm ET


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10 comments to Dozen M4 quakes and above hit Eastern Japan since Thursday — Four at intensity 4 of 7 on JMA scale

  • BreadAndButter BreadAndButter

    Look at this timeline graph showing all Japanese quakes since 3/11. The increased activity during the past months is obvious.

    • guezilla

      Actually it's decreased activity, since the red line indicates the "total energy released during the day". During days when there were very little erthquakes, the line will therefore fall near zero. On the left side of the grah quakeless days were very rare, but starting about this summer, there have been many more quakeless days, causing the line to fluctuate up and down.

      This is not all good news, of course; as can be seen from the graph, a quakeless day is often followed by much higher energy release on a day. A lot of small quakes helps to relieve the pressure that is exists and is constantly building higher. Of course, a lot of small quakes may also be indicative of movements leading to bigger release at once. On a general rule though, large earthquakes strike without advance warning, despite the number of scientists trying to predict their place and time.

      • bluerthanblu bluerthanblu

        Given magnitudes between the larger quakes, to me, we might be in a lead up to another @ 6 mag quake. Problem is that the medium sized quakes cause more unsettling of the foundations, i.e., not already disturbed by basement water and tides. R4 appears to be leaning a little more on the SE corner. They've plugged up the south side view pretty well so the steam mostly gushes out on the north side, to be confused with the plumage from R3. If this the best we can do to contain a runaway nuclear meltdown, as it cools and the buildings degrade, the dream of nuclear energy is dust.

        • guezilla

          By the way, about only thing earthuake swarms can somewhat reliably predict (besides as you say, further degraation of already unstable buildings) are volcano eruptions, due to the magma movements under the volcano. Guess what is at the yellow-dots area of the earthquake map? It's a volcanic area, that area rumbles constantly, still that mountain is due to go very soon.

  • PurpleRain PurpleRain

    Are there some unreported earth quakes or something going on in the USA? I'm asking because after listening to the Faieewinds Podcast, it seems like there are a lot of different nuke plants in the US that suddenly seem to be having containment issues. Why is this? Are they using that Mox fuel and doing damage to their own facility…or could there be some geological issues going on everywhere? Just curious.

  • MaidenHeaven MaidenHeaven

    Quake damage to turbine blades found at Tokai 13 July 2011

    The Tokai Daini plant, about 100 kilometers north of Tokyo, automatically shut down in the quake. The operator of the plant, Japan Atomic Power Company, has been checking the plant closely since May in a regular checkup scheduled to last 6 months.

    It says it discovered friction marks on the blades and other parts of the reactor’s turbines.

    The company believes the damage was caused by the March 11 quake as similar marring had been reported in another plant in Niigata Prefecture in the wake of an earthquake in 2007.

    The utility says some parts were also found missing from a device that injects coolant into the reactor. It also discovered cracks in equipment attached to the upper parts of the reactor.

    It says it is investigating whether those defects were also caused by the March quake.

    In the giant quake, the Tokai Daini plant lost its outside power sources, and had to rely on emergency generators until regular power returned.

    Earlier this month the government nuclear safety body found the level of quake-resistance of the electrical equipment at the plant was below the standard set by power companies.

  • timemachine2020 timemachine2020

    Look at the Jnn/ TBS cam shaking right now