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Major quake in eastern New Britain PNG NOW

  1. May 4, 2015 #1

    davenn

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    Eastern New Britain is being severely rattled over the last week
    starting on the 30th April with a M 6.7 and shortly after a M 6.8 followed by numerous aftershocks over the last 5 days.

    A M 7.4 has now hit the same area
    http://www.sydneystormcity.com/seismograms.htm

    as can be seen, the seismo trace is hitting the stops, top to bottom of the display


    cheers
    Dave
     
  2. jcsd
  3. May 4, 2015 #2
    Saw the news story earlier. btw, the US state Michigan had a M4 yesterday which is pretty rare for the area I think.
     
  4. May 4, 2015 #3

    davenn

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    Hi Greg, yes I saw that, a M 4.2 .... one of that size would definitely be pretty rare in that region

    There were supposed reports of it being felt in Milwaukee, WI ... seemed a bit doubtful considering the distance
    But weird things happen, maybe those that felt it were in high rise buildings ?

    Dave
     
  5. May 4, 2015 #4
    Could be, I am downtown and didn't notice anything
     
  6. May 4, 2015 #5

    davenn

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    OK just been putting together a graphic for this latest sequence and the last major event a month ago

    201504-05 ongoing events New Britain, PNG.jpg

    data courtesy of USGS

    cheers
    Dave
     
  7. May 4, 2015 #6
  8. May 4, 2015 #7

    davenn

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    hi Stevie, yes a M 5.8

    you can still see that on my online seismogram .... link in the first post

    follow the time line along from the UTC 0200 and a few minutes after 0230 (~ 0234) the P wave starts

    My Mom and Dad live a little inland from Dunedin, They felt it quite well


    Dave
     
  9. May 4, 2015 #8

    Astronuc

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    USGS ranks it at M7.5 - 130km SSW of Kokopo, Papua New Guinea
    http://earthquake.usgs.gov/earthquakes/eventpage/us20002bnf#general_summary
    2015-05-05 01:44:05 (UTC)

    Looks like they have somewhat of a swarm going on:

    M5.2 - 124km SSW of Kokopo, Papua New Guinea 2015-05-05 02:40:23 (UTC)
    M5.6 - 103km S of Kokopo, Papua New Guinea 2015-05-05 01:58:20 (UTC)
    M5.9 - 109km SSW of Kokopo, Papua New Guinea 2015-05-05 01:54:05 (UTC)

    Fortunately, they are decreasing in magnitude.

     
  10. May 5, 2015 #9

    davenn

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    ohhhh its gone back up

    it started as a 7.5 went down to a 7.4 and now back up again :smile:

    they are just typical aftershocks of a large event
    It isn't too often that 2 large events .... the 6.7 and 6.8, late last week would be followed by an even larger event

    Dave
     
    Last edited: May 5, 2015
  11. May 5, 2015 #10

    Astronuc

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  12. May 5, 2015 #11

    davenn

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    uh huh

    as you can see in that map graphic I did a few posts ago. There was the 7.5 a month ago, to the east, and its aftershock sequence was pretty much contained in the red box. I'm going to have to dig out my historical data and see what is happening seismic gap wise in the region

    Dave
     
  13. May 5, 2015 #12

    Astronuc

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    Ref: http://earthquake.usgs.gov/earthquakes/eventpage/us20002bnf#general_summary

    One should be able to search the area between the dates (over the last century) and filter by magnitude.

    On another site, I was following the seismic activity along the Sunda trench and intersections of the Australia, Indian, Eurasian and Pacific plants over the last 10 years. Unfortunately that site no longer exists.

    I appreciate the 3D volumetric time dependent plots that some folks do that show the progression of swarms around a big event. I don't have the software to do that.
     
  14. May 5, 2015 #13

    davenn

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    I was doing a search whilst you were typing
    the whole region has been very active for M 7.0+ events

    1900-2015 historical events M7.5 plus, New Britian reg PNG1.JPG

    Alan Jones ( maybe you know (of) him) does stuff along those lines ... has written some good software for display quakes around the world

    Dave
     
    Last edited: May 5, 2015
  15. May 5, 2015 #14

    davenn

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    I hate the way the forum software compresses the pix so much :(
    turns them to crap to try and read
     
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