Giant Louisiana sinkhole swallows more land — Officials: New crack observed, dozens of trees lost

Published: March 26th, 2013 at 3:06 pm ET
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Title: Slough-In Occurance/Advisory from the Office of Conservation
Source:  Assumption Parish Police Jury
Date: March 26, 2013 at 2:25p ET

The Office of Conservation, in consultation with Assumption Parish Incident Command, is advising the public that a slough-in occurred last night along the southeastern side of the sinkhole – approximately 25 trees fell into the sinkhole along the southeastern side and a new crack, running parallel to the sinkhole edge, was observed on the Oxy 3 well pad access ramp to the sinkhole. Experts with Conservation and CB&I believe the slough-in event is linked to the period of elevated subsurface fluid and gas movement detected late last week in the area around the sinkhole and Oxy 3, as has been observed in previous similar events. At this time, the Oxy3/sinkhole monitoring alert status remains at Code 1, allowing work around the sinkhole to continue, as the slough-in appears to be related to the earlier subsurface activity – however, monitoring is constantly ongoing in the area and Conservation will advise the public of significant changes in subsurface conditions.

The Advocate. 3:05p ET: Work continues as sinkhole swallows more trees [...] About 25 trees fell into the Assumption Parish sinkhole and a new crack formed in a earthen well pad south of the lake-like slurry hole Monday night, state regulators said. [...] Conservation officials reported that experts working for the agency believe the slough-in and cracked well pad are linked to the prior seismic events so work could continue. [...] The latest acreage was not immediately available. [...]

See also: Paper: 'Very long period' tremors increasing at giant Louisiana sinkhole -- Indicates gas and 'liquid' moving underground

Published: March 26th, 2013 at 3:06 pm ET
By

17 comments

17 comments to Giant Louisiana sinkhole swallows more land — Officials: New crack observed, dozens of trees lost

  • Lion76 Lion76

    Bets on how far this goes? over/under 60 I'm going OVER


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    • 16Penny 16Penny

      I think your wager would be safe. Without seeing the VSP, I would say that the entire top of the dome will be gone within a few years, the whole cap rock fallen in. The only way to prevent it would be to seal the below ground formations and seal the surface breach to the aquifer. Also, any cracking of the caprock that would be discovered by VSP or existing mapping would have to be sealed.

      In my opinion it is too late for measures to be taken. The sinkhole will not wait for weeks for models and drilling and grouting. It is changing too fast for any plan to be reasonably formed and implemented. They have lost a handle on it.


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      • Thad

        16P
        What do you consider to be the entire top of the dome that will be gone in a few years? The subsidence and crack in the Oxy#3 pad could be just that. Part of the 20 acre soil subsidence around the sinkhole and not related to salt being dissolve at all. They keep describing a line along the salt dome edge– if it were salt dissolving the line should be back on top of the dome. Along a line at the dome edge would suggest the dome to a degree is supporting slowing subsidence above the dome–


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  • Ibuiltthis Ibuiltthis

    I agree it will be over 60 acres by the time this sinkhole is done growing!


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  • Khernel_Panic

    Load up your racing snails, the nothing is coming.


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  • rainbeaudais rainbeaudais

    irhologram….I wasn't ignoring your question a few days ago. Was trying to decide how much was safe to post. Decided to go ahead and finish a video I had been working on, that may help you to understand.

    http://youtu.be/J2djWGkx-mk

    The newest sloughin wasn't a surprise, between the seismic activity and the work they've been doing on and in the sinkhole the last few days, which looked fairly intensive.

    @2:38

    http://www.wbrz.com/videos/530pm-news-replay-sunday-mar-24/


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  • Thad

    The 3 million cu yd void, the missing material, is equal to 3600 acre feet— 90 acres with an average depth of 40 ft..


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  • Anthony Anthony

    Sheriff: If La. salt dome collapses, 'It would be hell of a catastrophe'

    LOUISIANA SINKHOLE MARCH 22, 2013 BY: DEBORAH DUPRE

    **The state is following an oil mafia type of corporate rule to expand the salt dome under Lake Peigneur, despite its collapsing salt dome 50 miles away at Bayou Corne and despite the 1980 collapsed Lake Peigneur Salt Dome catastrophe.**

    http://www.examiner.com/article/sheriff-if-la-salt-dome-collapses-it-would-be-hell-of-a-catastrophe


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  • irhologram

    Thad, I'm confused again. The mining of salt at Lake Peigneur was NOT done in a salt dome? Because regardless of what puncture drained the lake into the cavern that caused the man made tunnels to collapse…the structure of a salt dome is vulnerable when penetration, no matter how the breach happened or whether or not the cavity is filled with brine…Yes? Could that be the point Anthony was making?


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    • Thad

      irhologram
      Read the article or others and think- Many here are thinking/ one has claimed that the saltdome at Lake Peignuer collpsed and caused the events following in the same manner as the cavern collapse in the Napoleanville saltdome– that was not the case.
      The Diamond Crystal Salt mine was a conventional mine with three levels, miles of tunnels and had been in operation for many yrs- was in operation at the moment of the disaster. The bit entered through the roof of a third level tunnel and the lake drained in to the mine.. Collapse of the mine was after the event and was not the cause of the event.


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  • irhologram

    Cavities in the ground collapse when breached, whether due to drilling, earthquake or migration pressure. Yes?


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  • irhologram

    Wow, Rain. I guess some things are worth living for, and the Zen of it is, they're worth dying for. Your video is ssuuweeet! Yeah. I guess I get it.


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