RE: New Guinea tsunami information.

From: Glenn Morton (
Date: Sun Feb 10 2002 - 11:15:41 EST

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    Hi Allen,

    >-----Original Message-----
    >From: []On
    >Behalf Of Allen Roy
    >Sent: Saturday, February 09, 2002 10:26 PM
    >To: Darryl Maddox;
    >Subject: New Guinea tsunami information.
    >From: Darryl Maddox <>
    >> Could you provide a reference on that tsunami study. That
    >sounds like one
    >> should have in my library of articles.
    >quotes from web page:
    >"Figure 2: Location of the Arop School transect. Tsunami sand deposited
    >across the coastal plain is a lighter color where it is not buried
    >by a thin
    >layer of mud. ..."
    >"Tsunami deposits were common and were identified as gray-colored sand
    >typically overlying a brown, rooted soil (Figure 4)."
    >[Note: Only sand thought to be tsunami deposit. The overlying mud not
    >identified as tsunami deposit. Tsunami happened July 17, scientists there
    >on Sept 27. Nothing else but the tsunami could have put the mud on top of
    >the sand. AR]
    >"For further information, contact:
    >Dr. Guy Gelfenbaum
    >Dr. Bruce Jaffe"
    >I asked one of these two scientists about why the mud on top of the tsunami
    >deposits was not studied. He told me in an email (which I no longer have
    >due to a computer crash) that the mud must have been deposited by the
    >tsunami, but that it was too thin to study.

    This is not surprising at all and this mud layer has no analogy with what
    is seen in the Haymond.

    First, a look at the picture shows that the vast majority of the area is not
    covered by the mud. In the Haymond and other turbidites, the shale is thick
    and widespread.

    SEcondly, any tsunami water trapped in a puddle on top of the sand will
    contain some shale. The water will flow through the porous sand, filtering
    the shale out and leaving it on the surface of the sand. This is why the
    shale doesn't cover the entire deposit.

    Thirdly, this is a tsunami deposit which is above sea level which allows the
    shale-containing water to flow down through the porous sand as noted above.
    Below sea level, this won't happen. The water will not flow through the sand
    like it does on land.

    So, this has nothing to do with a turbidite.


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