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Not Another, Gosh: Vanuatu hit by large quake

  1. Apr 28, 2016 #1
  2. jcsd
  3. Apr 28, 2016 #2

    ProfuselyQuarky

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    Ugh . . . large magnitude earthquakes are becoming more and more common.
     
  4. Apr 28, 2016 #3
    As our detection technology gets better and as our population (and therefore technologists) become more numerous, it does seem as if things once uncommon are now appearing more frequently. However, a quick look at the stats usually dispels this feeling. And, of course, we do have flurries of activity at almost every level.
     
  5. Apr 28, 2016 #4

    ProfuselyQuarky

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    True, but you don't need detection technology to notice a 7.0 magnitude earthquake :) Just sayin'.

    I get what you're saying, though.
     
  6. Apr 29, 2016 #5

    davenn

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    no they are not ... the yearly averages haven't changed in the last 100 or so years

    ON avg. there are around 18 x M7.0 - 7.9 events each year, that equals 1 event in that range every 21 days
    for M 8.0 and greater 1 per year. Some years see 2 x M8+ events other years there are none


    Dave
     
  7. Apr 29, 2016 #6

    Astronuc

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  8. Apr 30, 2016 #7

    davenn

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    Hi Stevie

    Yup, the Vanuatu area is keeping its name as a very seismically active region
    This latest M 7.0 was onshore in the centre of the Island Archipelago, and this meant that a tsunami was unlikely

    The distance from recent large events to the north of this one make it a new separate event rather than an aftershock.

    2016-04 Vanuatu Event 2.JPG


    cheers
    Dave
     
  9. May 3, 2016 #8
    Connecting the dots, is this a fault line?
     
  10. May 3, 2016 #9

    davenn

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    Hi there

    not in this case, the events ... main shock and aftershock events are actually showing the direction that the fault line dips at

    The main fault line, that is, the plate boundary, is shown by the red line running roughly north - south in the above pic
    This region is a subduction zone with seafloor west ( left) of that red line, diving down under the seafloor/land to the east (right) of the line

    so in cross-section we see something like this ......
    ( a very quick and rough drawing) not to scale but will give you the idea :smile:
    subduction.GIF

    The black dots being the quakes



    cheers
    Dave
     
  11. May 4, 2016 #10

    Astronuc

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