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Major quake Bougainville PNG ---- NOW

  1. Jan 21, 2017 #1

    davenn

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  2. jcsd
  3. Jan 21, 2017 #2

    davenn

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    Location map

    170122 M8.0, PNG.JPG


    M 8.0 40km W of Panguna, Papua New Guinea
    2017-01-22 04:30:24 (UTC)
    153.8 km deep
     
    Last edited: Jan 21, 2017
  4. Jan 21, 2017 #3

    Astronuc

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    USGS reports it as 8.0 - http://earthquake.usgs.gov/earthquakes/eventpage/us10007uph#executive
    M 8.0 - 40km W of Panguna, Papua New Guinea
    2017-01-22 04:30:24 UTC
    Lat 6.267°S, Long 155.119°E
    153.8 km depth - very deep
    http://earthquake.usgs.gov/earthquakes/eventpage/us10007uph#map

    • Panguna, Papua New Guinea (I wonder how much shaking they had?)
      40.9 km (25.4 mi) W
      Population: 2,916
    • Arawa, Papua New Guinea
      49.6 km (30.8 mi) W
      Population: 40,266
     
  5. Jan 21, 2017 #4
  6. Jan 22, 2017 #5

    davenn

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    yeah, that meant the max'ing out of my seismo didn't last as long as it would have for a shallower event

    even at around 150+ km from the event, the shaking would be intense ... many major mining projects on Bougainville


    Dave
     
  7. Jan 22, 2017 #6

    Baluncore

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    An earthquake at 154 km is quite deep. Note that this earthquake was 140 km east of the Planet Deep, 29,988 feet (9,140 m), the deepest point in the New Britain Trench, Solomon Sea.

    The Planet Deep in the Solomon Sea was found by the German survey vessel SMS Planet in 1912. There was another eponymous 'Planet' Deep for a while in the Philippine Sea, but later survey vessels found deeper points nearby in the Philippine Trench.

    The SMS Planet was scuttled at Yap Is, 7th Oct 1914 to avoid capture by the Japanese in WW1. The Yap Trench is only 35 km from Yap Island. It seems that there was some significant attraction between the SMS Planet and deep trenches.
     
  8. Jan 22, 2017 #7

    Astronuc

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    I'm wondering what the peak ground acceleration was. I wonder if they have any accelerometers in place at any of the mines.
     
  9. Jan 22, 2017 #8

    davenn

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    looks like it got up around 80% of g

    2017-01 Mw7.9 Bougainville PGA.jpg
     
  10. Jan 22, 2017 #9

    davenn

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    raw seismogram screenshot off my system, just before it started to overwrite the previous line

    170122  UT M 8.0 Bougainville, PNG zhi.gif


    Processed file

    170122.042702.zhi.psn.gif


    cheers
    Dave
     
  11. Jan 22, 2017 #10

    fresh_42

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    Oops, I mean wow! Is the tsunami warning still active? Or has there been one. ##0.8 \,g## sounded a lot.
     
  12. Jan 22, 2017 #11

    davenn

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    there was an alert put out, but was cancelled after it was found that there were no significant waves generated

    pretty significant, but by no means the largest
    exceeding 1g happens periodically with larger events, M6 and up ... lots of factors come into play, type of fault motion, ground type
    to name a couple.
    The M 6.3 quake that wrecked Christchurch, NZ in Feb. 2011 had a peak ground accel. of 220.3% g pretty much above the focus.
    there was a soft ground location some 10 km to the north ( just east of the city centre) that hit 188.7% g

    pretty serious recordings for a moderate event

    Dave
     
  13. Jan 22, 2017 #12

    Astronuc

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    On the other hand, that moderate quake was shallow, at a depth of 5 km (3.1 mi).

    The Great Tohoku earthquake of March 2011 had PGA of ~3.0 g
    More on PGA - https://en.wikipedia.org/wiki/Peak_ground_acceleration
     
  14. Jan 22, 2017 #13

    davenn

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    indeed ... makes a big difference
    another in the list of the many factors that affect ground motion :smile:
     
  15. Jan 24, 2017 #14
    Astronuc, there are no operating mines on Bougainville at this time (nor since the late 1980s). I have reports from a few places along the west coast -- landslides, some houses knocked down, but so far no reports of fatalities. Also, the place Panguna hardly exists anymore. It references the copper mine there, which is no longer in operation.
     
  16. Jan 24, 2017 #15

    davenn

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    I didn't realise that

    it made for some interesting history reading
     
  17. Jan 24, 2017 #16
    davenn - yes, it does. It's a complex and sad tale. I worked as an anthropologist on Bougainville (west central, among the people called Nagovisi) in the late 1960s and into the early 1970s. At that time, the Panguna mine was in operation, and although it wasn't the only cause of the long and deadly war of secession, it certainly played a major role. I was last there in 2001, after the fighting died down.
     
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