Tuesday, March 22, 2011

Updated Visualisations for Japan

Download: Fukushima-Data.zip (1.1MB) updated at 22-03-2011T11:44Z

With thanks to Gemma Hobson and her ongoing efforts at data entry, we've now extended the duration of the visualisation to cover a full four days. From 17:00 on the 16th of March through till 16:00 on the 20th of March.

Environmental Radioactivity Measurement, 17:00 16th March - 17:00 20th March -- For data from the Fukushima site itself see the "Readings at Monitoring Post out of 20 Km Zone of Fukushima" data sets online. Data collection from Mlyagi (Sendai) ceases at 17:00 on the 17th of March and does not resume. Several other smaller duration data drop outs also occur during the monitored period.

It can be seen that radiation levels near Fukushima are somewhat higher than the original visualisations, whilst the previous data showed peak around 0.15 µSv/h, measurements are now peaking at 0.25 µSv/h. The typical minimum and maximum values across Japan are plotted below on the same scale for comparison.

Additionally, the map embedded below again shows the environmental radioactivity measurements with respect to the typical maximum values for that locale.

Environmental Radioactivity Measurement,
Ratio with respect to typical Maximum Values

This shows that enhancement around Fukushima is now spiking around four times typical maximums, the previous visualisations showed enhancements of only around twice typical maximums.

Finally, earlier today Sarah Novotny pointed me in the direction of an excellent visualisation by Paul Nicholls showing the series of magnitude 4 to 6 aftershocks that are still rocking Japan. Over 670 to date since the original magnitude 9 earthquake.

Japan Quake Maps by Paul Nicholls

Update: I've just been pointed to this interesting visualisation of the original magnitude 9 earthquake in Japan. It was created using GPS readings from the Japanese GEONET network, which should not to be confused with the similarly named GeoNet network in New Zealand.

The video shows the horizontal (left) and vertical (right) displacements recorded when the earthquake struck. The resulting ground movement ripple propagating through the country is very evident.


  1. Hi Alasdair!

    Not sure if you're aware of my continuously updated data download at


    It reaches back until March 1, 2011.

    I also drafted some video animation of the peaks. See http://www.youtube.com/watch?v=Jow12lzSCUI

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