Sinkholes in de VS

wo 27 mar 2013, 13:32

Sinkhole swallows more trees
River Parishes bureau
March 27, 2013
http://theadvocate.com/home/5543772-125 ... e-swallows

BAYOU CORNE — About 25 trees fell into the Assumption Parish sinkhole and a new crack formed Monday night in a earthen well pad south of the lake-like slurry hole, state regulators said.

Experts working for the state Office of Conservation believe the collapse and cracked well pad are linked to now-calmed seismic events from late last week, officials said in a statement Tuesday.

Because of that connection, agency officials said the discovery did not halt work around the sinkhole and the area remains in emergency officials’ lowest “alert” status.

Parish officials also estimated Tuesday that the edge collapse, or slough-in, probably bit off a quarter-acre from the formerly 13-acre sinkhole’s southeastern edge. More firm measurements are pending.

The sinkhole is located in swamps between the Bayou Corne and Grand Bayou communities and has required the continued evacuation of more than 350 people in those areas.

A failed Texas Brine Co. LLC cavern in the Napoleonville Dome is suspected of causing the sinkhole and related consequences. The cracked surface pad had been used for the original access well to the failed cavern, Oxy Geismar No. 3.

John Boudreaux, director of the parish Office of Homeland Security and Emergency Preparedness, updated other activities in the sinkhole response Tuesday:

Data gathering for a critical three-dimensional seismic survey of the subsurface under the sinkhole ended Sunday and equipment is being collected. Results are due April 21.
Crews moved in a specialized drilling rig, called a snubbing unit, on Tuesday that can handle high pressures so they can begin clearing out blockages in a key access well to the failed Texas Brine cavern.

Early on Friday, experts detected an uptick in “very long period” tremors, a type of stretched-out seismic event, that have been linked to fluid and gas movement underground.

The tremors were detected under the sinkhole and around the failed Texas Brine cavern.

Past increases in tremors sometimes have preceded slough-ins and burps by the growing sinkhole.

The state Office of Conservation statement was listed Tuesday on an Assumption Parish government blog about the sinkhole.

The edge collapse happened roughly opposite from a nearly 1-acre slough-in on the western edge of the sinkhole that followed other tremors earlier this month.

That earlier slough-in, combined with other measurement changes, had boosted the sinkhole’s area to 13 acres.

The new crack is in an out-of-use ramp connecting the well pad to the sinkhole. The crack is parallel to the sinkhole’s southern edge.

Boudreaux said the crack in the well pad ramp seem to be providing “real signs” that the ramp is likely to fall into the sinkhole soon.

At one time, the ramp, which is on the northwestern side of the well pad, had been used as an access point for operations on the sinkhole, but earlier tremors this year cracked the pad and led to fencing off that area.

Boudreaux said crews more recently have accessed the sinkhole from a spot on the east side of the pad.

Conservation officials said they were continuing to monitor the situation.

do 28 mar 2013, 01:03

www.youtube.com/watch?v=DWIdRqkWqmU

di 09 apr 2013, 14:50

di 09 apr 2013, 12:14

Automobilisten in doodsangst door sinkholes

AMSTERDAM -
Automobilisten in de Russische stad Samara zijn hun leven niet zeker. De stad wordt geteisterd door metersdiepe sinkholes. De heftige beelden zie je in de Nieuwsflits met het videonieuws in 100 seconden.

http://www.telegraaf.nl/binnenland/2146 ... les__.html

ma 15 apr 2013, 12:08

Gepubliceerd op 12 apr 2013

This is the latest and most up to date information on the Bayou Corne Sinkhole Disaster, presented to The BRC by Dr Gary Hecox of CB&I (formerly SHAW), APPJ and LDNR. I took the slides from the presentation, enlarged them and present them as a video.

Many are text, so you will need to pause to read those, and should watch in full screen.

Included is a video showing water movement on the sinkhole, never seen by the public not attending the first meeting.

The selected members of the BRC are named with their credentials at the end of the video.

Thanks, once again to all involved in attempting to get those of us that want to be home, home safely, and to all the site workers, as well as Texas Brine staff, that are risking their lives for us, every day.

do 18 apr 2013, 21:20

Giant Louisiana sinkhole swallows more land after ‘burp’ — Water continuing to move — “Indication that event is not over”
Published: April 18th, 2013 at 11:31 am ET
By ENENews

Title: Burp & Slough-In
Source: Assumption Parish Police Jury
Date: April 18, 2013 at 9:30a ET
h/t Anonymous tip

There was a “burp” within the sinkhole this morning as well as a slough in on the east side (of which measurements are not yet available). Water in the sinkhole continues to move which is an indication that this event is not over.

The installation of the seismic equipment and implementation of the code system are essential in indicating that events like this will happen before they actually do. Over the last three days, the seismic equipment used in the monitoring process showed signs that prompted officials to heighten the code level in the sinkhole to Code 3 (explanation below). Dr. Horton and Dr. Hecox, both diligently observing the monitoring process, were able to raise the code level in prediction of such an event as this. [...]

Watch Tuesday’s flyover footage

vr 19 apr 2013, 10:55

check:

wo 24 apr 2013, 18:38

Flyover 4/23/13

za 27 apr 2013, 11:18

Officials: Wall around giant sinkhole must be ‘re-routed’ — Land is sinking outside boundary — “Ongoing surface subsidence”
Published: April 26th, 2013 at 10:11 am ET
By ENENews

Title: 9:25 p.m. Advisory from the Office of Conservation
Source: Assumption Parish Police Jury
Date: April 25, 2013

The Office of Conservation, in consultation with Assumption Parish Incident Command, is advising the public that Texas Brine is preparing to re-route the western wall of the sinkhole containment berm further west, and extend the northern and southern berm walls accordingly, due to ongoing surface subsidence in a portion of the existing western berm wall. While the sinkhole’s western boundary remains more than 100 feet away from the existing western berm wall, ongoing filling of the failed Texas Brine Oxy 3 cavern and compaction of the disturbed rock zone surrounding the sinkhole have created an area of surface subsidence outside the sinkhole boundary. [...]