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Fred99
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  #2063324 27-Jul-2018 09:21
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At least the eruption in Hawaii is well behaved - not a phreatic event (yet). That description of the Pupuke eruption "This normally shows that the magma left its host area in a hurry" suggests rather bad behaviour, as does nothing much left except a big crater in the ground.


 
 
 
 

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tdgeek
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  #2063326 27-Jul-2018 09:22
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GV27:

 

The 'eruption location' thing is a bit of a misnomer too; look at the vents spewing lava in Hawaii at the moment; some of those are 3km from the crater of the actual volcano. 

 

It's possible you could end up with multiple significant evens in multiple places at once. You could have a cone in Mission Bay but lava all over the place in Glen Innes. 

 

 

Exactly. Its a field, with 50 known pimples scattered around. The new ones or punctured old ones, who would know


Fred99
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  #2075764 19-Aug-2018 14:07
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NZ Seismograph network lit up from a very large M8.2 quake - a couple of hundred km E of Fiji an hour and a half ago.

 

USGS has depth of this quake at 563 km.  One of the largest "deep" (could be the second largest?) quakes ever recorded.

 

The three little blips commencing 1/2 hour or so afterwards are aftershocks - around M5.

 

Deep focus earthquakes don't normally have much aftershock activity - if any.

 

There's also not a consensus on what causes them - as explained in that link.

 

 

 

 

 

 

 




Fred99
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  #2075867 19-Aug-2018 17:14
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That's pretty interesting IMO - there's been a M6.8 aftershock.

 

Similar to after the 2013 Okhotsk Sea  M8.3 earthquake there was a M6.7 aftershock.

 

 


DjShadow
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  #2075902 19-Aug-2018 20:07
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Geonet note on their Facebook page that this is the 4th time since 1900 such a big quake has happened so deep


Fred99
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  #2075909 19-Aug-2018 20:35
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Pretty rare also for such an aftershock sequence - including a M6.8 and 6.3.  Deep quakes often don't have any at all.  OTOH smaller aftershocks at those depths probably aren't very noticeable - except with instruments.

 

I guess some geologists will be quite excited about this - the characteristics of the aftershocks might help them better understand WTF is actually going on down there - which might help explain better what goes on up here sometimes.

 

That main shock energy was the equivalent of ~ 30 megatons of TNT - and it's not really known how it let rip.

 


GV27

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  #2079233 26-Aug-2018 09:02
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New Geonet piece re: Tongariro

 

https://www.geonet.org.nz/news/52NxpH9bg4MWoIEqiG2kKA

 

"A large hydrothermal system exists at Tongariro, but we now know that features like Ketetahi, Te Maari and Red Crater are separate and can behave independently."

 

Incidentally it seems that activity at Ruapehu has dropped way way back after that little burst a few months ago. 

 

 

 

 

 

 




Fred99
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  #2085317 7-Sep-2018 08:26
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And another large deep quake (M7.8 / 600km) in approx the same area to the E of Fiji.

 

 


Fred99
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  #2087030 10-Sep-2018 16:36
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"Phantom" quakes automatically triggered by GNS network, following a large quake S of the Kermadecs.  An interesting number of "felt" reports in the NI - I presume they weren't dreaming - so the place must have had a bit of a wobble.  It's showing as M7.0 on USGS site, about 100km depth.  No tsunami threat.

 

 

 

Hmmm : Stuff puts out an (apparently incorrect) headline:

 

 

 


MikeB4
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  #2087034 10-Sep-2018 16:49
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There was a quake in Wellington circa 4.20pm. Made our rattle a little


Fred99
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  #2087043 10-Sep-2018 16:54
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MikeB4:

 

There was a quake in Wellington circa 4.20pm. Made our rattle a little

 

 

Yep - that was the one - but epicentre was south of the Kermadecs.

 

USGS have revised magnitude to 6.9.  Geonet still not on the case and still showing the "phantom" quakes 1/2 hour after the event.  That's not very good IMO, as very large quakes in that region would be a real Tsunami threat.


tdgeek
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GV27

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  #2091003 15-Sep-2018 11:16
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A Radio NZ story on the name of Taranaki/Egmont had an interesting comment in it: 

 

https://www.radionz.co.nz/national/programmes/eyewitness/audio/2018660222/taranaki-or-egmont-what-s-in-a-name

 

"1985. Labour is now the new government; Koro Wetere, the Lands Minister. As the mountain threatens to erupt for the first time in centuries, Taranaki Māori make their move and request its name be changed."

 

I can't find anything online relating to this 1980s period of unrest, or any details of the last incident of volcanic tremor, just the last eruption date sometimes in the mid 1800s. Anyone here the wiser? Unless it's just metaphorical, but there's this later:

 

"In the end, the volcano rumbled but didn’t explode - and neither did the feared racial unrest. Both just calmed down."

 

So does anyone perhaps a bit more senior have any recollection of this activity?

 

 

 

Also: A series here from Stuff about quakes, mostly focused around Wellington and the South Island 

 

https://www.stuff.co.nz/national/nz-earthquake/104517944/faultlines-evacuating-wellingtons-cbd-on-foot-after-a-big-quake-is-no-walk-in-the-park

 

 


Fred99
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  #2091894 17-Sep-2018 12:40
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There's an EQ search tool on the Geonet site.  This was the result of 2 years from 1 Jan 1984:

 

 

So there's nothing showing there, a few small shallow quakes to the NW, nothing close to the mountain, some deep quakes to the south - nothing at all suggesting that "the mountain was rumbling".

 

It sounds like there might have been a bit of a back-story to the RNZ article - probably something being stirred up for political reasons - not geological reasons.

 

There's a paper available here discussing a new monitoring network operating in the early '90s.  There's no mention there I could find of any "pending eruptive seismic activity" in the mid '80s.


GV27

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  #2150970 27-Dec-2018 09:52
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Requested unlock due to the current activity in Indonesia and Sicily. 

 

Some spectacular footage from earlier eruptive activity is out there:

 

Krakatoa:

 

https://www.youtube.com/watch?v=NLhjNzQHphQ

 

There has also been a large quake in Sicily, unclear if this is a precursor to a larger volcanic event at Etna. 


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