BS: Giant sinkhole in Guatemala

Subject: BS: Giant sinkhole in Guatemala
From: Little Hawk
Date: 01 Jun 10 - 12:40 PM

Here's something you don't see every day.

Guatemala sinkhole

It would certainly make me nervous to be living anywhere near that thing.

Subject: RE: BS: Giant sinkhole in Guatemala
From: pdq
Date: 01 Jun 10 - 12:55 PM

Some years ago a large sinkhole opened up in Florida on May fifth.

I considered it my duty name the new landmark "Sinkhole De Mayo".

Subject: RE: BS: Giant sinkhole in Guatemala
From: Q (Frank Staplin)
Date: 01 Jun 10 - 12:58 PM

Much like the famous sinkholes in Yucatan. Caves in limestone are the cause there; I don't know what the subsurface is like in Guatemala.
Collapse of old mine workings have caused similar sinkholes in the U.S. and elsewhere.

Subject: RE: BS: Giant sinkhole in Guatemala
From: Royston
Date: 01 Jun 10 - 01:07 PM

That is mindblowing; particularly that it should be so perfectly round. Old mineworkings? I don't know.

Looks like Guatemala City has form for this

Story Here

Subject: RE: BS: Giant sinkhole in Guatemala
From: Q (Frank Staplin)
Date: 01 Jun 10 - 01:26 PM

Not the first in the city. One in 2007 is supposed to have been causes by sewer water dissolving the underlying rock.
Some of the largest known are in Venezuela.

The U. S. Geological Survey: They are common anywhere "where the rock below the surface is limestone, carbonate rock, salt beds or rocks that can be dissolved by ground water circulating through them."
Caverns develop and the land above can collapse into them.

Subject: RE: BS: Giant sinkhole in Guatemala
From: gnu
Date: 01 Jun 10 - 01:31 PM

Royston... "Old mineworkings?"

Sure looks like it, but "pipes" do occur in rock.

Subject: RE: BS: Giant sinkhole in Guatemala
From: GUEST,TIA
Date: 01 Jun 10 - 01:32 PM

Much of Guatemala is underlain by Karst.
In there areas, there are caves that have been there for millenia.
Sinkholes happen when there is a storm, or a water or sewer line break.
The infiltrating water carries the overburden down into the cave system.
Usually, the cavity forms at the top of rock over the cave, then eats (stopes) its way up until it breaks through at the surface.
In February 2007 an slightly smaller one happend in Guatemala City when a sewer line ruptured underground.
Three people died in that 300-foot hole.

Subject: RE: BS: Giant sinkhole in Guatemala
From: Q (Frank Staplin)
Date: 01 Jun 10 - 01:38 PM

Thanks, TIA; karst of course develops in limestone areas.

Subject: RE: BS: Giant sinkhole in Guatemala
From: GUEST,TIA
Date: 01 Jun 10 - 05:31 PM

Limestone, dolomite, gypsum or evaporites. Anywhere that the bedrock is slightly soluble in water.

Subject: RE: BS: Giant sinkhole in Guatemala
From: Amos
Date: 01 Jun 10 - 05:58 PM

The whol eof the Yucatan peninsula, just north of Guatemala, is riddled with underlying cave and tunnel systems carved by centuries of water seeping through the limestone under the jungle. These make some of the most exhilarating dive locations on Earth--huge barrel-like caverns that haven't seen daylight in thousands of years, others with thin fingers of sunlight streaming down in just one corner, with ancient trilobites from a long-departed sea embedded in the ceilings, phantasmagoric displays of stalactites and stalagmites forming cathedrals, and strange blind white fishies that live at the boundary between the fresh water from above and the salt water from below.

Subject: RE: BS: Giant sinkhole in Guatemala
From: Q (Frank Staplin)
Date: 01 Jun 10 - 10:29 PM

No trilobites, Amos. They died out long before the carbonates of Yucatan were deposited.

But dive me some Maya gold that the sacrificed young maidens wore when they were tossed into the sinkholes.

Subject: RE: BS: Giant sinkhole in Guatemala
From: Alice
Date: 01 Jun 10 - 10:57 PM

Yes, that new one in Guatemala city is mind blowing to see.

Karst pools in the Yucatan are called cenotes.

There is a famous cenote (seh-NO-tay) at Chichen Itza that I have visited. Green water in the cenote, and creepy feeling thinking of all the victims sacrificed there.
click Photo

Subject: RE: BS: Giant sinkhole in Guatemala
From: Amos
Date: 01 Jun 10 - 11:15 PM

There were fossilized organisms in the cavern ceilings, when you lit them up with the dive flashlights, but perhaps I had the wrong name for them. They were spined in a way similar to trilobites but they may have been some kind of ancient fish-like things.


A

Subject: RE: BS: Giant sinkhole in Guatemala
From: GUEST,amergin
Date: 01 Jun 10 - 11:16 PM

Well, there's a huge sink hole down in Washington, DC....it is pentagon shaped....

Subject: RE: BS: Giant sinkhole in Guatemala
From: Don Firth
Date: 02 Jun 10 - 06:08 PM

From The Daily Beast:

Since this takes about 700 years to load, I thought I could save you time by cutting and pasting the whole article. If you have a tendency to feel slightly paranoid, maybe you'd better not read it. As to our living in a benevolent world, it's not all that reassuring.

The enormous sinkhole that swallowed a building in Guatemala is all the more terrifying for being so strange. From rampaging venomous snakes to tornadoes made of fire, here are a few more examples of how Mother Nature gets creative when she's angry.

Poisonous Gas Cloud
On August 21, 1986, in a valley in northwestern Cameroon, some 1,700 people and 3,500 animals suddenly dropped dead for no apparent reason. Scientists later discovered that Lake Nyos, sitting above the valley in the crater of a dormant volcano, had, over many years, slowly absorbed the carbon dioxide emitted by the magma far below it. When the water finally became saturated with the poisonous gas, it expelled it all at once in a toxic cloud moving at 125 miles per hour. The plume spread over 16 miles, suffocating many living things in its wake.

Snake Invasion
Mount Pelée, on the island of Martinique in the Caribbean, was the site of one the worst volcanic eruptions of the 20th century, killing tens of thousands in 1902. But days before it blew, dozens of people living in the small towns below it met an even grimmer fate. Hundreds of venomous snakes, sensing the impending blast, streamed into the streets, biting and killing at least 50 people and 200 animals along the way, according to San Diego State University's Department of Geological Sciences.

Elephant Rampage
What does it take to drive an elephant insane? Extremely high temperatures and not a drop to drink. In the spring of 1972, India's Chandka Forest, already scorched by drought, was hit by an unforgiving heat wave. The two events in combination began to affect the behavior of local wildlife. By mid-summer the local elephants, normally not a threat to humans, collectively lost their minds and stampeded through five villages, according to India's news agency, leaving considerable destruction and 24 dead in their wake.

Fatal Heat
Your average heat wave, this was not. In 2003, record-breaking temperatures took the lives of 35,000 people across eight countries in Europe. France bore the brunt of the losses with 14,802 dead. According to a report on the climate phenomenon by the Earth Policy Institute, "Though heat waves rarely are given adequate attention, they claim more lives each year than floods, tornadoes, and hurricanes combined."

Killer Cold
It was the real-life version of The Day After Tomorrow. In 1816, since known as the "Year Without a Summer," waves of frigid air brought heavy rains, frost, and snowfall across parts of the U.S., Canada, and Western Europe throughout the entire year. The freak weather conditions decimated crops and led to widespread famine. A piece in The Quebec Gazette read, "Under circumstances so unfavorable to the productions of the earth throughout so great an extent of country, precautions against scarcity cannot be too strongly recommended....Nothing which may provide sustenance for man or beast ought to be neglected..." Over 100,000 died as a result.

Asteroid Strike
The Tunguska asteroid event was so unusual that witnesses believed it was a visitation from a vengeful god. NASA now estimates that the 220 million-pound space rock hit the Earth's atmosphere at 33,500 miles per hour over Siberia on June 30, 1908, and had an impact equal to 185 Hiroshima bombs. It felled an estimated 80 million trees, but because the area it hit was so sparsely populated, no one was killed as a direct result of the strike.

Flaming Tornado
A fire tornado, or fire whirl, is perhaps one of Earth's rarest and most terrifying natural events. Fire whirls form when the rising heat of a fire is spun by wind into a conical shape, creating a column of spinning fire that can become as strong as a tornado. After the Great Kanto earthquake of 1923, which devastated Tokyo, a firestorm that included fire whirls killed 38,000 people in just 15 minutes.

Deadly Smog
London's 1952 killer smog was more than an eyesore, when 12,000 people died in four days from the toxic combination of fog and coal smoke. A sudden cold snap on December 5 of that year mixed with the city's ubiquitous chimney smoke, causing dense fog to roll in. Within two days, visibility in London was down to one foot. By the fourth day, thousands were dead, animals were stricken with black lung, and then, as quickly as it had arrived, the deadly smog was swept out to sea by the wind.

Hail Deluge
Hailstorms are familiar to any regular reader of Little House on the Prairie, but not hail that weighs 2.25 pounds like in the giant balls of ice that fell from the sky in the Gopalganj district of Bangladesh in 1986. The hail was considered the heaviest on record, and 92 people were killed when it pummeled the area.

Annoying Volcano
Though not as deadly as some other disasters, the recent Icelandic ash cloud became a disaster in and of itself, shooting a cloud up 20,000 feet into the air. Over the next few weeks, winds caused the cloud to expand south and east, eventually hovering over most of Europe and even into Russia. Hundreds of thousands of flights were grounded, although scientists said the eruption was not strong enough to have a long-term impact on the climate.

Then, added to all that, we're in line with one of the poles of Wolf-Rayet 104 in the constellation Sagitarius. WR-104 is a gamma-ray burster and it could blow at any time, bathing us with a jet of gamma-rays. According to a number of astronomers, we're staring right down the barrel of the shotgun.

Well . . . what can I say but—have a nice day.

Don Firth

P. S. Somehow, I find myself particularly fascinated, in a horrified sort of way, with the flaming tornado.