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M 7.5, central New Guinea, PNG

  1. Feb 25, 2018 #1

    davenn

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    very large event had my seismometer hitting the stops for some time

    zhi.gif

    and the low gain channel so things could be seen more clearly

    zlo1.gif


    Location map with aftershocks

    upload_2018-2-26_11-50-27.png


    USGS Data for the event

    M 7.5 - 89km SSW of Porgera, Papua New Guinea
    Time: 2018-02-25 17:44:44 (UTC)
    Location: 6.149°S 142.766°E
    Depth: 35.0 km

    Dave
     
  2. jcsd
  3. Feb 26, 2018 #2

    berkeman

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    Holy smokes!
     
  4. Feb 26, 2018 #3

    davenn

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    An update as the aftershocks continue to roll in the two largest ones have been a 6.0 and a 6.3
    As can be seen on the updated even map below, the events stretch out in a line. With the main 7.5 shock located roughly in the middle of the events it shows a really nice bi-lateral rupture sequence ( where the fault ruptures in both directions along the fault line)

    upload_2018-2-27_8-9-43.png

    This line is the front of a large fold and thrust fault zone (Highlands Fold and Thrust Belt) along the southern edge of the mountains.

    upload_2018-2-27_8-24-46.png


    The moment tensor data clearly shows a thrust fault motion for this event
    with the dip-slip to the north east and this agrees with the plate motion arrows in the previous map
    The amount of plate motion is indicated by the length of those arrows and for the area of the quake, the convergence is around 50mm / year

    upload_2018-2-27_8-28-3.png


    Fault motions and "beach balls"
    The 3rd one down relates to the thrust motion of this 7.5 quake
    focalmechs.png



    cheers
    Dave
     
  5. Mar 6, 2018 #4

    davenn

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