New Earthquake West of Honshu Unleashes Avalanches, Destroys Large Sections of Nagano Railway
The quake measuring up to 6.6Mw struck about 45km NNE of Nagano, the capital city of Nagano Prefecture, west coast of Honshu.
The quake struck at a depth of about 10km Friday, March 11, 2011 at 18:59 UTC (3:59am local time), triggering large landslides and avalanches in the snow-topped mountainous area, and destroying roads and railway sections.

EQ Location Map. Source: USGS. Map enhanced by FIRE-EARTH
Sendai Mega Quake – Update March 12
Japan Meteorological Agency (JMA) has issued a new round of Tsunami Warnings for Japan Region, including Major Tsunamis Warnings for at least 18 prefectures (states) on the eastern coast of Hokkaido island, NE, E and southeastern coast of Honshu island.
Meanwhile, as the extent of damage becomes clear, witnesses speak of “colossal damage” from the Mega Quake and its associated Tsunami, with entire towns “washed away” along the eastern coast of Honshu.
FIRE-EARTH has estimated that the cost of damage could reach a trillion dollars.
Radiation Leak Confirmed at Fukushima Nuclear Power Plant Reactor No. 1, Following Sendai Mega Quake
Nuclear reactor No. 1
Japanese authorities have confirmed radiation leak at Fukushima Nuclear Power Plant Reactor No. 1, and have evacuated people living with a 10-km radius of the reactor.
Nuclear reactor No. 2
They now fear radiation leak at the Plant’s Reactor No. 2, and have evacuated people living within a 3-km radius of that reactor. They have also put on evacuation notice everyone living within a 10-km radius of the reactor
Death Toll from Sendai Mega Quake and the Tsunami
Confirmed death toll stands at 242 victims, with more than a 1,000 people reported as missing, as of 02:00UTC Saturday, March 12, 2011.
Earthquake FIRES
- There are at least 50 large to major fires still burning, as of posting.
- The 3 fires at Cosmo Oil Refinery in Ichihara City, Chiba prefecture (near Tokyo) were burning out of control, as of latest reports.
- The Kawasaki Steel Plant in Soga city (also in Chiba Pref) has reportedly “exploded.”
Aftershocks
At least 130 significant aftershocks (≥5.0Mw) have struck near March 11 Sendai Mega Quake, with the latest measuring 6.8Mw timed at 01:47:16 UTC Saturday, March 12, 2011.

EQ Location Map of the latest significant aftershock measuring 6.8Mw. Source: USGS
Largest 5 Earthquakes Since 1900
The Sendai Mega Quake was the 5th largest earthquake to occur globally since 1900. The following image and list show the location, magnitude and other details of the shocks.

Click image to enlarge. Source: USGS/EHP
A list of the 15 largest earthquakes since 1900 is available at USGS site.
Map of Sendai Mega Quake

A map of the location of the Sendai March 11 Mega Quake, including foreshocks (dotted lines) and aftershocks (solid lines) incorporating elevation data from NASA’s Shuttle Radar Topography Mission and ocean bathymetry data from the BODC. Source NASA-EO. Click image to enlarge. Download larger image (398 KB, JPEG). Acquired March 11, 2011.
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