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First seismic T-Phase events for 2015

  1. Jan 6, 2015 #1

    davenn

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    hi everyone,
    Well we are into a new year and into new discoveries and observations

    Yesterday morning, Jan 6th, 0548NZST ( 05 Jan 1748UT) there was a reasonable quake in the mountains of the central South Island of New Zealand M 6.0 GNZ ( M 5.6 USGS). Now the quake itself isn't unusual, NZ is prone to regular quakes because of its location straddling the Indo-Australian Plate and Pacific Plate boundary.
    What was unusual is that this is the first time I have seen/recorded T-phase waves from an inland event.
    All previous events have been under the seafloor, see previous thread .... https://www.physicsforums.com/threads/seismic-t-waves.785155/

    This first image is of the long period seismogram to show the overall quake. The T-phase is not identifiable in this image as it is buried in amongst the surface waves

    150105 174842UT M5.6 ( 6.0GNS) Sth Is event with T-phase1.jpg


    This second image shows the P wave arrival at 1752UT and the T-Phase arriving at ~ 1810UT
    Note its amplitude is much larger than either the P or S arrivals ( actually the S wave arrival cannot be seen)

    150105 174842UT M5.6 ( 6.0GNS) Sth Is event with T-phase .jpg


    The surprises that this subject of seismology is still coming up with :)

    cheers
    Dave
     
  2. jcsd
  3. Jan 6, 2015 #2

    Bystander

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    I was going to ask about that. Been on the news for hours, and no post, I was starting to wonder.
     
  4. Jan 6, 2015 #3

    davenn

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    It was out in the middle of nowhere. Arthur's Pass would have been about the closest community, maybe Cass. I have not heard of any damage reports. Tho many closer in probably did have crockery off shelves etc
     
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