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Author Topic: Halley base shut down and new crack in Brunt shelf  (Read 16394 times)

solartim27

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Re: Halley base shut down and new crack in Brunt shelf
« Reply #50 on: October 29, 2018, 03:44:56 AM »
Here's a snip from the latest Polarview.  Looks like Chasm 1 has joined up with the Halloween crack, but hard to say for certain.  I find the straightness of the new crack section to be a concern, perhaps a data glitch in that area? Of course we just saw the rectangular bergs.  Even if it is all the way through, it still may not move significantly.  It also looks to me like there is also a crack extension heading to the coast, but perhaps I need to clean my glasses.
Original image 34 mb
https://www.polarview.aq/images/105_S1jpgfull/S1B_EW_GRDM_1SDH_20181027T231436_AC7B_S_1.final.jpg
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solartim27

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Re: Halley base shut down and new crack in Brunt shelf
« Reply #51 on: October 30, 2018, 06:25:12 AM »
Okay, so that's two in a row, but it still looks weird.  Original 10 mb
https://www.polarview.aq/images/105_S1jpgfull/S1A_EW_GRDM_1SSH_20181029T234745_234F_S_1.final.jpg
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solartim27

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Re: Halley base shut down and new crack in Brunt shelf
« Reply #52 on: October 30, 2018, 05:29:29 PM »
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iwantatr8

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Re: Halley base shut down and new crack in Brunt shelf
« Reply #53 on: October 30, 2018, 06:03:18 PM »
Here's a view switching between the 7th and the 27th Oct - you can clearly see the crack has extended and checking here https://apps.sentinel-hub.com/sentinel-playground/?source=S2&lat=-75.53564672956175&lng=-26.096477508544922&zoom=13&preset=1_NATURAL_COL0R&layers=B01,B02,B03&maxcc=85&gain=0.4&gamma=1.0&time=2015-01-01%7C2018-10-27&atmFilter=&showDates=true
at the crack tip shows this to be about 1 km over the 20 days.

i think we could be looking at a differently shaped ice shelf before xmas...

solartim27

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Re: Halley base shut down and new crack in Brunt shelf
« Reply #54 on: November 05, 2018, 06:57:14 PM »
Very nice animation from July 30, 2016 to Oct 30 2018

https://adrianluckman.wordpress.com/2018/10/31/
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FrostKing70

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Re: Halley base shut down and new crack in Brunt shelf
« Reply #55 on: November 05, 2018, 07:43:29 PM »
Interesting animations!   Does any one have access to information on how big (area and volume) the calving events would be from Chasm 1 and the Halloween Crack (when they eventually go, although I believe one or both will happen this summer)?

FrostKing70

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Re: Halley base shut down and new crack in Brunt shelf
« Reply #56 on: November 06, 2018, 08:27:35 PM »
I have done some poking around on the internet and have not been able to find any indication of the potential size of the calving events.   Can any one point me towards to good source?

solartim27

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Re: Halley base shut down and new crack in Brunt shelf
« Reply #57 on: November 07, 2018, 07:45:35 AM »
Here is a wider view of the Brunt Ice Shelf showing the other side of the Halloween Crack.  Looks like there is a chance for a significant  calving there.
Original image 53 mb https://www.polarview.aq/images/105_S1jpgfull/S1B_IW_GRDH_1SSH_20181106T233049_C2BC_S_1.final.jpg

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iwantatr8

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Re: Halley base shut down and new crack in Brunt shelf
« Reply #58 on: November 20, 2018, 03:46:54 PM »
SolarTim27,

I think you are right, here's this month's animation showing the MIR area.
you can see that in the area above the widening Halloween crack there is another crack starting up across the area of the shelf that you have highlighted.

No sign of Crevasse 1 at this scale yet but my guess is that it won't be long.


FredBear

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Re: Halley base shut down and new crack in Brunt shelf
« Reply #59 on: November 24, 2018, 10:39:09 PM »

FredBear

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Re: Halley base shut down and new crack in Brunt shelf
« Reply #60 on: December 12, 2018, 06:34:56 PM »
  .   .   and Halley opened up again by BAS   .    . 

https://www.bas.ac.uk/media-post/summer-fieldwork-begins-at-halley

iwantatr8

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Re: Halley base shut down and new crack in Brunt shelf
« Reply #61 on: December 13, 2018, 05:35:37 PM »
Looks like Chasm 1 has advanced some more - very close to calving now...