Objective
We have confirmed that some normal earthquake fault has emerged along the Yunotake Fault by the earthquake (M7.0) which occurred on April 11th on Hama-dori in Fukushima Prefecture, which we did not think need to be considered as active faults in terms of the aseismic design.
Based on this, in order to check whether there have been activities of Yunotake Fault after the Late Pleistocene (after approximately 120,000 ~ 130,000 years ago), we have been Conducting boring and trench investigations around the fault
Status of investigation (quick report)
In the past we did not consider Yunotake Fault to be active fault that needs to be taken into account in terms of aseismic design based on the condition of the surface of the grand and the evaluation on fault activities, as it is far from the nuclear power plant sites (approximately 50 km from Fukushima Daiichi and approximately 40 km from Fukushima Daini) and its impact will be small in terms of fault length.
However, since the earthquake fault has emerged along Yunotake Fault after the earthquake, we have been conducting the boring investigation and the investigation in the area shown in the left lower as the investigations by which we can understand the status of the basement, in order to confirm in more detail if there have been activities of Yunotake Fault after the Late Pleistocene.
As a result, we have found some evidence (slips) in the sediment that we evaluated became deposited after the Late Pleistocene, which implicates Yunotake Fault acted in the past. Now we have been analyzing the time of the sediment and once we have finished it, we will announce the result.
See full report here
Related articles
- TEPCO submits heavily redacted copy of Fukushima nuke accident manual – After seeking a guarantee of nondisclosure the day before (enformable.com)
- Increased Nuclear Risk After March Disaster – 14 New potential active faults near Nuclear Power Plants (enformable.com)
- Investigation of faults under nuclear plant to resume despite complaints from utilities (enformable.com)
- TEPCO Changes Reactor 3 Cooling Methods to Cool Slumped Fuel Coore (enformable.com)
- TEPCO revises timetable to cold shutdown for seventh time in eight months (enformable.com)
- Dangerous New Earthquake Threats Found Under Monju and Tsuruga Nuclear Power Plants Before Thought Inactive (enformable.com)
- New TEPCO data suggests there are 5 active faults near Fukushima nuke plant – Previously considered unlikely to cause quakes (enenews.com)
- TEPCO to release interim report on Fukushima nuclear accident in November (enformable.com)
- New Exposed Scandal Shows TEPCO Calculations in 2006 Showed Probability of Worst-Case Tsunami ‘dramatically increased’ – 10% over 50 Years – Utility Took No Countermeasures (enformable.com)
- The ‘funeral company’ – Tepco set a new low for corporate behavior (enformable.com)
- Tepco staff on front lines feel victims’ anger “The people who come here are furious” (enformable.com)
- March 14th, 2011 – Looks like RCIC at Fukushima Daiichi Unit 2 has failed. (enformable.com)
- TEPCO Confirms I-131 Still One of Three Main Nuclides Found In Seawater Near Unit 1 to 4 (enformable.com)
- Worker Died of Acute Leukemia, TEPCO Said in Aug 30 Press Conference (ex-skf.blogspot.com)
23 
244
