Coordinates: 16.6645 S 69.0442 W
No:388        (list of all attractions)
Categories:Impact craters
Values:Geology
Rank:4
Address:South America, Peru, Puno region, near the border with Bolivia, near Carancas village
Diametre:13.5 m
Depth:4.5 m (initial depth)
Age:5 years (2007)
Piece of Carancas meteorite, Peru
Piece of Carancas meteorite.
Meteorite Recon, Wikimedia Commons / CC BY-SA 3.0

The first impact crater whose formation was observed by people in modern times was Carancas impact crater in Peru. It formed in the 15th September 2007.

Impact

It happened in 11:40:14 local time. Local people saw a bright flash, heard deafening explosion (it was well heard also in the 10 km distant Desaguadero town) and soon a mushroom cloud rised above the ground. Some locals thought that army of Chile has attacked Peru.

Earth trembled, windows in the 1.3 km distant Huanocollo were shattered - most likely by earthquake and not explosion. An empty shack some 120 m west from the impact was bombarded by pieces of soil - but was not damaged heavily.

A man riding a bicycle some 100 m from the impact site fell down and was dizzy from all the things happening around - but his eardrums were not ruptured. Pieces of soil flied up to 350 m far.

Crater

The impact created in the soft soil a 13.5 - 14.2 m wide crater, 4.5 m deep, with 1 m high rim around it. Earth and plants were scorched around the impact site.

In a few minutes time the groundwater entered the crater and started to boil. According to locals it boiled approximately for half an hour.

Ar was filled with fetid smells.

Mysterious illness

Soon locals rushed towards the site of impact to see this amazing natural spectacle. Some believed that the meteorite could have high value and were searching for it - and they really found many peaces around the crater. In total some 600 people visited the place soon after the impact.

Some days later things took unexpected turn. More and more people became ill - they got nausea, womit, diarrhea, headaches, dermatitis. Some of the worst affected were 8 police officers who spent more time than others at the crater. In total some 200 people became ill - although it is possible that some part of them rushed to hospitals after hearing rumors that victims of meteorite can get free medicine and in fact they were not THAT ill.

Happily some days later the health of people improved - and now all these events seem to be much exxagerated.

It is not entirely clear what caused this illness. One hypothesis says that this is caused by the arsenic in the vapour - reportedly local groundwater contains much arsenic. Urine of some ill people contained much arsenic indeed.

Others deny this theory - the amount of arsenic in local groundwater is not too high. Another explanation is that people inhaled the vapour of meteorite itself. Chondrite can contain troilite - sulphurous mineral which could be a hazard to health.

Whatever are the reasons - Peruvian experience shows that a visit to a fresh meteorite impact site can be hazardous to health.

Hyperfast chondrite?

Soon, in the 20th September Peruvian scientists reported that in Carancas took place meteorite impact.

Research continues, but now it looks like some 7 - 12 t heavy (1.6 - 2 m in diameter) chondritic meteorite (H4-5 chondrite) entered the atmosphere with a speed of some 12 - 17 km per second.

As it was going through the atmosphere from east to west, it lost part of its mass and slowed down to some 3 - 6 km/sec.

The ground was hit by approximately 0.3 - 3 t heavy, 0.5 - 1.1 m large meteorite and there was released energy with an equivalent of 1 - 3 t TNT.

Pieces of this meteorite were found nearby, up to 200 m far from the crater, small meteorite grains are mixed in the soil as well.

Scientists were puzzled by the fact that meteorite was hot - in general such meteorites are cold after their fall. Now it known that such relatively small meteorites can cross the atmosphere without dividing into several pieces.

New landmark

People in Carancas village have decided to preserve this amazing landmark. It is covered with temporary tent now and there is planned to build a small museum over it.

This shows how fast the things can change. In summer 2007 these empty fields near Carancas were of no interest to the outside people. Then in some minutes everything changed and... now we got another landmark!

Estimates show that meteorites of such size fall on Earth yearly - but most of them disappear in the sea or remain unnoticed in remote areas.

Map

See Carancas impact crater on the map of Peru!

References

  1. G.Tancredi, J.Ishitsuka, P.H.Sschultz, R.S.Harris, P.Brown, D.O.Revelle, K.Antier, A.Le Pichon, D.Rosales, E.Vidal, M.E.Varela, L.Sánchez, S.Benavente, J.Bojorquez, D.Cabezas, and A.Dalmau. A meteorite crater on Earth formed on September 15, 2007: The Carancas hypervelocity impact. Meteoritics & Planetary Science 44, Nr 12, 1967–1984 (2009).

Creative Commons Non-Commercial Share Alike 3.0 15 February 2013

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