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Sat Dec 15 14:04:01 CST 2012

from the the sea ground sediment (0~1cm depth) in July of 2011. It
proves the Fukushima contamination reached 7300m deep in the Pacific
detecting Cs-134.

They observed the upsurge of phytoplankton around the Japan deep from
late March to early April in 2011. They assume Cs-134 fell down with
the mass of marine snow.

Also, at the point of 110km east from the epicenter, they observed the
local strong current with a certain direction. Due to this strong
current, dead bodies of sea creatures and the sorts of fish that can=92t
fix themselves at one location were carried to the deeper area. Almost
no living benthos was found.

At both of the 110km area and 115km area, they observed mineral
particles causing seawater extraordinary unclear. The thickness of the
unclear layers were 30m and 50m in each.

20,000 Bq/Kg from school swimming pool sediment in Miyagi prefecture

According to a citizens=92 radiation monitoring station in Kakuda city
Miyagi prefecture, significantly high level of Cs-134/137 was measured
from sediment in a swimming pool.

The pool is located in an elementary school of the city. The school is
probably going to have a swimming class this year.

Chapter1. State of the Environment Annual Environment report 1992

Ground subsidence is brought about by the excessive extraction of ground wa=
Once it has subsided, ground cannot return to its former level. This
can cause severe damage and problems to architectural structures.

Ground subsidence was already observed in Tokyo's Edo-ku and in West
Osaka before the Pacific War. After the war, economic stagnation
resulted in a temporary pause, but by the mid-1960s it resumed
countrywide, with some locations even recording a severe drop of more
than 20cm annually.

After that, as a result of regulations on the use of ground water,
land subsidence has gradually decreased. However, even in 1990, 5
locations (a total of 14km2) dropped by more than 4cm, and 18
loca-tions (totaling 360km2) dropped by more than 2cm. Particularly
affected are the Northern Kanto Plain, the Kujukuri Plain in Chiba
prefecture. and Chikugo-Saga Plain in Saga prefecture (Figure 1-1-27).

Fig. 1-1-27 Land Subsidence Across the Nation in FY 1991

In the video at the top of this post Tepco mention injecting materials
to block and solidify the ground to block ground water but as the
above chart shows, that could destabilise the ground levels by
effecting the pressure and direction of the ground water.. Spent fuel
pool 4 at Fukushima Daichi is in peril as the ground has already
dropped after the 2011 earthquake and subsequent remedial works. Did
Tepco use the ground water at Daichi? Are they taking into account the
porous nature of the rock type/fractures?  [Arclight2011part2]

arclight2011part2 | June 25, 2013 at 7:11 am | URL:

Thanks for flying with

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