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NZ earthquake 14.11.16 - Mag 7.8

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  1. Nov 13, 2016 #1

    fresh_42

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    I know we have members who watch earthquakes and especially in that region.

    http://www.bbc.com/news/world-asia-37967178
    Potsdam and CNN even report 7.8 in 10 km depth. Tsunami warning set.
    Does anybody know more?
     
    Last edited: Nov 13, 2016
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  3. Nov 13, 2016 #2

    Borg

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    Last edited: Nov 13, 2016
  4. Nov 13, 2016 #3

    Borg

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    Oops. Fixed it.
     
  5. Nov 13, 2016 #4
    apologies for the sloppy writing

    http://www.stuff.co.nz/national/86416304/live-north-canterbury-quake

    "A severe earthquake measuring 7.5 magnitude has hit in North Canterbury, near Hanmer Springs.

    It was widely felt in both the South and North Islands, as far north as Auckland, causing damage and knocking out power."

    I felt it all the way in Wellington. The house shook so much I thought the earthquake was based in Wellington. A few things fell down. Also, lots of aftershocks, some rather big, some small but still noticeable.

    Then the tsunami sirens went off so I had to get out of bed and gather a few items. Currently we are all further inland. I believe the sirens have now stopped, but we'll wait a bit more.

    I cannot imagine the damage in Christchurch again.
     
  6. Nov 13, 2016 #5

    Bystander

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    https://www.physicsforums.com/threads/7-4-earthquake-usgs-in-nz.893195/#post-5619024 [Broken]

    Edit: @davenn
     
    Last edited by a moderator: May 8, 2017
  7. Nov 13, 2016 #6
    Hope everyone is safe!
     
  8. Nov 13, 2016 #7

    Borg

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    A minor tsunami did occur in NZ but isn't expected to impact anything beyond the island.
     
  9. Nov 13, 2016 #8

    fresh_42

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    As to why there are varying figures on the scale (USGS changed from 7.4 to now 7.9, Potsdam had 7. 8 and I've heard 6.6 by local reports):
    A geology professor on a news channel here said: "It's difficult to determine the exact magnitude because it lasted so long, more than 2 minutes." Aftershocks are still occurring, but the danger of a major tsunami is likely banned.
     
    Last edited: Nov 13, 2016
  10. Nov 13, 2016 #9

    Astronuc

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    NZ Geonet reports Mag 7.5 at 15 km depth, 15 km north-east of Culverden, which is about 53 km NNE of Amberley
    https://www.geonet.org.nz/quakes/region/newzealand/2016p858000

    There are several large quakes toward Kaikoura reported by USGS.

    Mag 6.5 - http://earthquake.usgs.gov/earthquakes/eventpage/us10007795#executive,
    https://www.geonet.org.nz/quakes/region/newzealand/2016p858055

    Mag 6.2 - http://earthquake.usgs.gov/earthquakes/eventpage/us100077aj#executive,
    https://www.geonet.org.nz/quakes/region/newzealand/2016p858279

    and a few more in the 5 to 6 Mag range.
     
  11. Nov 13, 2016 #10
    It was so scary, I was nearly in tears while we drove inland thinking our home could be gone. You hear about this happening overseas, but you really know what it feels like when you're faced with that situation.

    A lot of schools and business' will be closed in Wellington and Christchurch. The trouble is NCEA end of year exams are happening.
    "NZQA are yet to issue a statement on exams but they have talked to RNZ. A spokeswoman said most schools around the country should be open for business, but others in the quake and tsunami zones may not be. It may be the case at some schools that their practice exam results are used in place of exams, using the standard "derived grades" process."

    So far, two people are confirmed dead.
     
  12. Nov 13, 2016 #11
    Two nice videos on New Zealand tectonics


    Pushing New Zealand's Boundaries

    followed by:
    New Zealand: where two tectonic plates collide
     
  13. Nov 13, 2016 #12

    davenn

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    Yes, the initial report from GNS ( in NZ) was 6.6, it was horribly under estimated ... my system was in overload for some 40 minutes and when the USGS report of 7.5 came out I knew that would be much closer to reality.
    The really interesting thing about this event and the subsequent ones is that they are very widespread but in a line from the original M7+ and trending NE'wards
    The whole area fired up. I have seen this several times over the years around the world but not like this in New Zealand.
    And interestingly, almost all of the larger following events were not even in the area of the main shock.

    So far 2 people have been reported killed, one when their house collapsed on them :frown:


    Dave
     
    Last edited: Nov 16, 2016
  14. Nov 13, 2016 #13
    Yeah! I was checking geonet.org.nz and I saw all these earthquakes after the 12.02am happening around the country... one even by Levin!

    But you have scum like this -- http://www.stuff.co.nz/the-press/ne...ghton-family-has-house-ransacked-truck-stolen who take advantage of the situation. Low life scum bags.
     
  15. Nov 13, 2016 #14

    Evo

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    So happy you and your family are ok Stevie.
     
  16. Nov 13, 2016 #15
  17. Nov 13, 2016 #16
    I've been watching davenn's observation of the NE trend to the "aftershocks" and they are, indeed, unusual. Until the latest one, a 6.8 near the first quake, they (the later quakes) are moving closer to Wellington. It looks like they are along the offshore projections of the Wellington and Wairarapa faults on the other island. Very interesting and unnerving if I lived in Wellington.
     
  18. Nov 13, 2016 #17

    Astronuc

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    Kaikoura_Blenheim_earthquakes-nz.png
    I took a screen shot of the USGS page of recent earthquakes.

    The Mag 7.8 is the blue dot, and the second Mag 6.5 is the red dot. North of Kaikoura, straddling the fault are a Mag 6.5, 6.2 and 6.1 earthquakes. To the northeast is a cluster of Mag 5s near Ward, NZ, Lake Grassmere and Cape Campbell.

    Seismotectonics of the Eastern Margin of the Australia Plate
    http://earthquake.usgs.gov/earthquakes/eventpage/us100077hw#region-info
     
    Last edited: Nov 13, 2016
  19. Nov 13, 2016 #18
    Last edited: Nov 13, 2016
  20. Nov 13, 2016 #19

    davenn

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    ohhh man, ya just gotta love inaccurate media reporting :rolleyes: . None of the events have been anywhere near Nelson City,
    let alone Nelson Province

    But the comment from GNS about it being a double event, is a possibility, it does happen periodically
    I'm going to be really interested to see if any visual ground surveys of the region of the main event shows any surface faulting
    It may not happen because of the depth.


    Dave
     
  21. Nov 13, 2016 #20

    Astronuc

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    Another site for information and interesting maps showing faults.
    http://www.canterburyquakelive.co.nz/

    http://www.canterburyquakelive.co.nz/Browse/?Index=106
    They have the big one at 7.53 Mag, or equivalent to 30 Mt.

    Nelson to Kaikoura is about 130 km (80.7 miles). Is it possible Nelson received some P-waves? Possibly from the Mag 6+ group that were 12 to 23 km N to NNW from Kaikoura toward Blenheim?

    A number of years ago, I was about 60 miles from a Mag 6.5, and I felt the P-wave then S-wave. I was sitting on a large couch, and all of a sudden, it started shaking like an imbalanced washing machine. Moments latter, it started bouncing.
     
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