Japan Earthquake 11/03/2011 Recorded at Keele

Just a quick post as I’m teaching all day.

Here is the seismogram of the M8.9 Japan (Near East Coast Honshu) earthquake that occurred at 05:46:23 UTC today 11/03/2011 recorded at Keele University, Staffordshire, UK. Note that even at a quarter of the way round the world from the epicentre our seismogram clips during the surface wave train.

More details from the USGS here.

10 Replies to “Japan Earthquake 11/03/2011 Recorded at Keele”

  1. This is my correct mail ID. shockingly devastating EQ. Would like to have tectonically sound PPT for undergraduate students of Z.B.Patil College, Dhule, Maharashtra, India. Thanks.

  2. Hello, I was very interested in the seismogram that you posted, as it was very similar to the one I recorded at my home in France. I see you are using AmaSeis, what sensor are you using? I am using a homebrew Lehman E/W, and post results on the PSN site http://www.seismicnet.com/cgi-dos/event.exe. Thanks, Andy.

  3. Hi, I am Naomi studying my PhD in UCL, and we currently do some research on seismology and seismometers as well. I was surprised and really interested about what your seismometer recorded and wondering about the time and amplitude scale of the figure. We tried to see if we get the similar results from our seismometer or not, so if we could know the time and amplitude, that would be really helpful. Thank you for responding and looking forward to hearing from you, cheers.

    1. Naomi,

      The time scale is in minutes after 5am (the origin time was 05:46:23)
      The vertical axis is in counts from the analogue to digital converter. For a SEP seismometer like this, 50 (counts) is one micrometre/second (i.e. the count is proportional to velocity of ground motion – in this case horizontal north-south).

      Let me know if you would like the sac file. Processing is done here using amaseis which is free.


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