The epicenter of 5/30 quake was deep as lower mantle of the earth / Deepest for M8 class quakes since 1900

Following up this article.. M8.5 occurred Ogasawara island offshore / Seismic intensity 5+ in Greater Tokyo Area [URL]


On 5/31/2015, Japan Meteorological Agency announced the quake of 5/30 was actually M8.1. They also revised the depth of the epicenter from 590 km to 682 km from recalculation based on 101 locations data.


They haven’t observed the deeper epicenter since 1900 among M8 class of quakes.

682km deep underground is where lower mantle lies under upper mantle. Japan Meteorological Agency states the quake was caused by Pacific plate.

50 minutes later than M8.1, M5.1 occurred at the same place but 5km deeper.




Français :

L’épicentre du séisme du 30 mai était situé dans le manteau profond : le record pour les M8 depuis 1900


Article lié : Séisme M8,5 au large des îles Ogasawara / Intensité 5+ dans le Grand Tokyo

Le 31 mai 2015, la Japan Meteorological Agency annonce que le séisme du 30 mai était en fait un M8,1. Ils rectifient aussi la profondeur de son épicentre de 590 à 682 km recalculé sur la base des données de 101 endroits.

Parmi les séismes de magnitude 8, ils n’avaient pas observé d’épicentre aussi profond depuis 1900.
682 km de profondeur le situe dans le manteau profond, sous le manteau superficiel. La Japan Meteorological Agency affirme qu’il a été provoqué par la plaque Pacifique.
50 minutes après le M8,1, un M5,1 est survenu au même endroit mais plus profond de 5 km.

About this site

This website updates the latest news about the Fukushima nuclear plant and also archives the past news from 2011. Because it's always updated and added live, articles, categories and the tags are not necessarily fitted in the latest format.
I am the writer of this website. About page remains in 2014. This is because my memory about 311 was clearer than now, 2023, and I think it can have a historical value. Now I'm living in Romania with 3 cats as an independent data scientist.
Actually, nothing has progressed in the plant since 2011. We still don't even know what is going on inside. They must keep cooling the crippled reactors by water, but additionally groundwater keeps flowing into the reactor buildings from the broken parts. This is why highly contaminated water is always produced more than it can circulate. Tepco is planning to officially discharge this water to the Pacific but Tritium is still remaining in it. They dilute this with seawater so that it is legally safe, but scientifically the same amount of radioactive tritium is contained. They say it is safe to discharge, but none of them have drunk it.


May 2015