Giant Sinkholes Spotted on Rosetta Comet
Giant sinkholes spotted on Rosetta's comet
Science Now, Los Angeles Times, July 1, 2015
http://www.latimes.com/science/sciencenow/la-sci-sn-comet-sinkholes-rosetta-20150630-story.html
Rosetta spies cometary sinkholes, BBC News
http://www.bbc.com/news/science-environment-33354872
Rosetta spots sinkholes on comet 67P
The Daily Mail, July 1, 2015
http://www.dailymail.co.uk/sciencetech/article-3146180/Rosetta-spots-SINKHOLES-comet-67P-Giant-abysses-formed-ice-turned-gas-surface-collapsed.html
The paper is:
Vincent, J.-B., and many, many otehrs, 2015, Large
heterogeneities in comet 67P as revealed by active
pits from sinkhole collapse. Nature. vol 523, pp. 63–66
(02 July 2015) doi:10.1038/nature14564
http://www.nature.com/nature/journal/v523/n7558/full/nature14564.html
Yours,
Paul H.
Showing posts with label Sinkholes. Show all posts
Showing posts with label Sinkholes. Show all posts
Friday, 3 July 2015
Wednesday, 8 May 2013
Understanding sinkholes
Understanding sinkholes
Understanding sinkholes. CBS Sunday Morning, May 5, 2013
http://www.cbsnews.com/video/watch/?id=50146208n
"When a cavity in the subsurface of the Earth collapses,
it's called a sinkhole. They swallow cars and homes,
even entire neighborhoods."
Yours,
Paul H.
Understanding sinkholes. CBS Sunday Morning, May 5, 2013
http://www.cbsnews.com/video/watch/?id=50146208n
"When a cavity in the subsurface of the Earth collapses,
it's called a sinkhole. They swallow cars and homes,
even entire neighborhoods."
Yours,
Paul H.
Tuesday, 1 June 2010
Guatemala City Sinkhole was "OT- Non Meteorite Crater Photo"
Guatemala City Sinkhole was "OT- Non Meteorite Crater Photo"
Tuesday, June 1, 2010 9:07 PM
Ryan wrote:
“Sinkholes are usually formed by the collapse of a void
underground. Typically this happens in limestone/marble/
carbonate rocks (where caves are normally formed)
because rainwater + CO2 (dissolved in H20) creates a
weak (carbonic) acid that eats at the CaCO3 of the
carbonate rocks (as it seeps down cracks), and begins
creating a gap. As the gap gets larger, more water flows
in, accelerating the process, until, eventually, a cavity
too large to support itself is created an collapses, thus
creating a sink hole.”
After finally finding a geologic map, I found that Guatemala
City is underlain by limestone, which perfectly explains
the sinkhole. Still, this is a classic example of a sinkhole
and the hazards that they pose to people and structures
in urban areas.,
Some of the largest examples of sinkholes are in China
where entire cave systems have collapsed producing
sinkholes that are called “tiankengs”. These sinkholes
are 100s of meters in diameters in diameter and deep.
For example:
Tiankengs in the karst of China by Zhu Xuewen and
Chen Weihai in Speleogenesis and Evolution of Karst
Aquifers at:
http://www.speleogenesis.info/pdf/SG9/SG9_artId3290.pdf
Tiankengs of the world, outside China by Tony Waltham
Speleogenesis and Evolution of Karst Aquifers
http://www.speleogenesis.info/pdf/SG9/SG9_artId3291.pdf
Introduction to Karst Tiankeng in China
http://theculturedtraveler.com/Archives/Nov2005/Karst_Tiankeng.htm
Yours,
Paul H.
Tuesday, June 1, 2010 9:07 PM
Ryan wrote:
“Sinkholes are usually formed by the collapse of a void
underground. Typically this happens in limestone/marble/
carbonate rocks (where caves are normally formed)
because rainwater + CO2 (dissolved in H20) creates a
weak (carbonic) acid that eats at the CaCO3 of the
carbonate rocks (as it seeps down cracks), and begins
creating a gap. As the gap gets larger, more water flows
in, accelerating the process, until, eventually, a cavity
too large to support itself is created an collapses, thus
creating a sink hole.”
After finally finding a geologic map, I found that Guatemala
City is underlain by limestone, which perfectly explains
the sinkhole. Still, this is a classic example of a sinkhole
and the hazards that they pose to people and structures
in urban areas.,
Some of the largest examples of sinkholes are in China
where entire cave systems have collapsed producing
sinkholes that are called “tiankengs”. These sinkholes
are 100s of meters in diameters in diameter and deep.
For example:
Tiankengs in the karst of China by Zhu Xuewen and
Chen Weihai in Speleogenesis and Evolution of Karst
Aquifers at:
http://www.speleogenesis.info/pdf/SG9/SG9_artId3290.pdf
Tiankengs of the world, outside China by Tony Waltham
Speleogenesis and Evolution of Karst Aquifers
http://www.speleogenesis.info/pdf/SG9/SG9_artId3291.pdf
Introduction to Karst Tiankeng in China
http://theculturedtraveler.com/Archives/Nov2005/Karst_Tiankeng.htm
Yours,
Paul H.
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