Sinkhole at Rainbow Beach

Submitted: Sunday, Sep 27, 2015 at 09:22
ThreadID: 130418 Views:3191 Replies:7 FollowUps:15
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A major sinkhole has occurred overnight at Inskip Point camping area near Rainbow Beach, Queensland with vehicles being lost. This is a recurrence of a similar event in 2011.
The ABC's report is here.
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Allan

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Reply By: Member - John and Val - Sunday, Sep 27, 2015 at 09:35

Sunday, Sep 27, 2015 at 09:35
Very spectacular Allan

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John
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Follow Up By: Member - John - Sunday, Sep 27, 2015 at 10:03

Sunday, Sep 27, 2015 at 10:03
John, is that the sinkhole from last night? Thanks in advance.
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Follow Up By: Member - John and Val - Sunday, Sep 27, 2015 at 10:14

Sunday, Sep 27, 2015 at 10:14
Yes John.

There's an ABC report here.

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John
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Follow Up By: Bazooka - Sunday, Sep 27, 2015 at 10:28

Sunday, Sep 27, 2015 at 10:28
There are a few pics on google plus a Youtube video from the 2011 collapse.
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Follow Up By: V8 Troopie - Sunday, Sep 27, 2015 at 17:48

Sunday, Sep 27, 2015 at 17:48
Does anybody know what causes those sink holes? Is it a cave collapsing or what? I can not imagine there being caves on a sand island.

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V8troopie
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Follow Up By: Ron N - Sunday, Sep 27, 2015 at 20:09

Sunday, Sep 27, 2015 at 20:09
V8 Troopie, I think you will find there's a high likelihood of limestone below the sand that has dissolved and formed a cave, which has then collapsed.

ABC Science - what causes sinkholes

Cheers, Ron.
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Follow Up By: V8 Troopie - Sunday, Sep 27, 2015 at 20:19

Sunday, Sep 27, 2015 at 20:19
thanks for that info Ron. Interesting explanation at that ABC article.

V8troopie
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Follow Up By: Dave(NSW) - Sunday, Sep 27, 2015 at 20:48

Sunday, Sep 27, 2015 at 20:48
I wonder if it had any thing to do with the earth tremor's they had up there at the end of July?
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Follow Up By: Motherhen - Sunday, Sep 27, 2015 at 23:00

Sunday, Sep 27, 2015 at 23:00
It appears that this was caused by water flowing through the sand, not a true sinkhole as in a limestone cave roof caving in.
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Follow Up By: Allan B (Member, SunCoast) - Monday, Sep 28, 2015 at 08:18

Monday, Sep 28, 2015 at 08:18
A survey being conducted by Geotechnical Engineers will hopefully provide the answer to this event.
The ABC report is here.
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Allan

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Follow Up By: Ron N - Monday, Sep 28, 2015 at 14:19

Monday, Sep 28, 2015 at 14:19
The geotechnical experts are now saying they think the event was essentially a beach "avalanche".
Water undermined the beach zone, and the beach and adjoining 100 metre area, effectively "slumped" into the sea, like an avalanche taking off downhill.
The entire area underneath the camping area would probably be well-saturated with water in the soil, so that would have a lubricating effect, making the soil move seawards more easily.
There is talk that the entire sand peninsula could disappear in time, due to similar events. But that time period could be up to a couple of hundred years, no-one really knows.
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Follow Up By: Kevin G6 - Tuesday, Sep 29, 2015 at 21:08

Tuesday, Sep 29, 2015 at 21:08
Moved seawards? Moved straight down by the aerial shot! Does anyone know about a couple who lost everything?

Kev
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Reply By: get outmore - Sunday, Sep 27, 2015 at 10:57

Sunday, Sep 27, 2015 at 10:57
that looks like a great place to fish, looks deep and must have put a heap of food into the water
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Reply By: Gone Bush (WA) - Sunday, Sep 27, 2015 at 11:34

Sunday, Sep 27, 2015 at 11:34
An instant deep water harbour for the ferry to Fraser.

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Reply By: Ross M - Sunday, Sep 27, 2015 at 12:15

Sunday, Sep 27, 2015 at 12:15
Looks like a Shark bite on a surf board.
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Reply By: Allan B (Member, SunCoast) - Sunday, Sep 27, 2015 at 12:27

Sunday, Sep 27, 2015 at 12:27
This is not a 'Happy Camper'!
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Reply By: Ron N - Sunday, Sep 27, 2015 at 13:14

Sunday, Sep 27, 2015 at 13:14
I'll wager a number of people are thumbing through insurance PDS's this morning to see if sinkholes are excluded from their insurance policies, as "an Act of God"!!
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Follow Up By: Patrolstl04 - Sunday, Sep 27, 2015 at 16:25

Sunday, Sep 27, 2015 at 16:25
I guess it has been sometime since you have read a PDS as this has not been a term used for a couple of decades....APRA shut that down a lonnnnng time ago.
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Follow Up By: Ron N - Sunday, Sep 27, 2015 at 20:03

Sunday, Sep 27, 2015 at 20:03
Interesting point, and yes, I notice the term is not used in any of the PDS's applying to any of my motor vehicle policies.
Funnily enough, "an act of God" is still a regularly-used term in contracts and legal documents, and the term is still recognised and accepted in both legal AND insurance circles. And it is obvious that some insurance contracts still utilise the term.

Mojomo Insurance brokers - Insurance words and their meanings

AIS Insurance Brokers - Insurance terminology
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Follow Up By: Bazooka - Sunday, Sep 27, 2015 at 20:42

Sunday, Sep 27, 2015 at 20:42
Perhaps Billy Connolly put the wind up them? What a great little movie - if you haven't seen it, do so.

https://www.youtube.com/watch?v=pOvI9jdNV3I
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Follow Up By: Patrolstl04 - Monday, Sep 28, 2015 at 19:52

Monday, Sep 28, 2015 at 19:52
I work in the insurance industry.

Act of God is not used in property or vehicle insurance.

A claim denial cannot use this as reason as it was changed at least 20 years back.

Insurance council or APRA will confirm this.
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Reply By: pop2jocem - Sunday, Sep 27, 2015 at 23:06

Sunday, Sep 27, 2015 at 23:06
The coastal plain to the north of Perth WA is mainly limestone and sandstone (surprise surprise). There is a river that flows during very heavy local rainfall in the Jurien Cervantes area, called the Nambung River, that flows towards the coast and if blocked by sand drifts from entering directly into the sea enters subterrainean caverns and reportedly can cause an area not far out from the shore line to be fresh enough to drink where it comes to the sea surface at some reef structure.
That whole area is riddled with caves and occassionally a depression forms on the land surface and now and then a sinkhole.
A ranger that patrolled the Nambung national park many years ago wrote in a book about one of the early settlers that while attempting to dredge a water hole deeper with a horse drawn dredge of some sort caused the floor of the waterhole to collapse into an underground cave. Apparently the farmer managed to scramble to safety but the horse and dredge dissapeared into the cavern and were never seen again.

Cheers
Pop
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