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The Alpine Fault, upper South Is., New Zealand

  1. Jan 5, 2017 #1

    davenn

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    Following on from my last post about stream offsets along active faults. This post is a little more about the Alpine Fault in particular. This is more about a place of interest, rather than about the science of tectonics

    Just off State Highway 7 ( the Lewis Pass Rd) that connects the east and west coasts of the upper South Island, is an interesting landmark. In 1964, Frank Evison and his colleagues built a concrete wall across the Alpine Fault trace, in the hope that one day there will be a rupture on the fault and the wall will get split in two. ( hasn't happened yet !). I had last visited this site some 18 years ago but didn't have a photographic record. So during the Christmas period of 2016 and being in the general region, I decided to revisit the site.

    The wall is 24m long and 1.4m high ( most of which is buried)

    Image 1
    My wife, Cindy, is standing on the wall directly above the fault trace which bisects the wall.
    2016_12_29_6860sm.jpg

    Image2
    In this image, I am standing on the fault and looking north east along the trace towards the wall.
    Even with the long grass, the vertical offset on the trace can be seen to the right side of the pic. ~ 1.5 - 2 metres.
    The trace continues onwards into the pic., across a river, through that line of trees, across the left hand base of that large hill (mound) and up the distant valley.

    2016_12_29_6863sm.jpg

    Dave
     
    Last edited: Jan 5, 2017
  2. jcsd
  3. Jan 5, 2017 #2

    davenn

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    Image3
    This image is from Google Earth. I have annotated the key points.
    The fault trace, the wall and the tectonic plates

    Alpine Fault Trace with wall 01sm.jpg

    Image4
    and a zoomed out view of the region
    Alpine Fault Trace with wall 02sm.jpg


    Again, for anyone who would like to Google Earth the location .....

    42.349176 S 172.224816 E


    Regards
    Dave
     
  4. Jan 5, 2017 #3

    Bystander

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    Muy interessant. Thank you. :oldwink:
     
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