Sinkhole bir anda ortaya çıkan dev çukurlar
I would like to ask about the stretch zones. There are a lot of sinkholes lately and they are appearing mainly all over the Eurasian and North American plates. They are appearing in the areas which according to the other criteria would be assumed as safe locations (far from volcanoes, mountain building, landslides and well above sea level). Is there any pattern to follow to estimate where would be a high probability for the sinkhole to open for various micro locations, because we can assume that we are in the safe location and next minute, the sinkhole opens beneath us swallowing everything?
Sinkholes almost invariably form in areas subject to karst limestone cavern formation. Underground water flows eat away the limestone leaving vast caverns and caves, which often give scant indication above ground that a cavern lies below. Karst limestone rock formations have been mapped and are known, however, but since one never knows just where a cavern might have formed, this provides little help in predicting just where a sinkhole might form. Sinkholes open up when the rock is fractured due to stress from being in the stretch zone, from the bending of a plate, or due to torsion.
To avoid the horror of a sinkhole suddenly opening up under one’s feet, one should avoid living in karst limestone regions. China is riddled with huge sinkholes, which are opening up due to the bending of the Eurasian Plate there as the Sunda Plate sinks. The Appalachian mountain region, including the sinkhole ridden State of Florida, has karst. Central America such as in Guatemala, Europe such as in Portugal or Spain or Russia, and Australia also have karst formations.
January 6, 2014 – UNITED KINGDOM – A large sinkhole has appeared in part of the Peak District in Derbyshire. The hole, which eye witnesses said measures about 160ft (49m) wide, has opened up in the village of Foolow. Caver Mark Noble, 58, from Eyam, said he saw the hole during a walk on Christmas Day, but believes the land began to fall the day before. He said he has explored the caves at Foolow in the past as huge cavities were left in the area from an old lead mine. Mr Noble said: “It’s quite a large hole and it’s getting bigger all the time. It’s probably increased by about 10% since it opened up. It is quite interesting but there are two other similar large holes that appeared about half a mile away from this one in the 1970s, so it’s not a new thing.” -