偶得一照片，与大家分享。 新西兰发生7.1级地震造成铁路变形 The 7.1 magnitude earthquake that struck New Zealand last September 4th caused an enormous amount of destruction, perhaps almost the least of which are these railway tracks that have been twisted like lone strands of spaghetti. The image is real, according to the photographers of this two-mile stretch of railway near hard-hit Christchurch. According to blogger, Dave Petley, the damage to the line, which links Canterbury with the west coast of the South Island, directly followed the terrible quake. In his own words: “The compression…was accommodated when a weak point was found, leading to a comparatively rapid deformation to form the main buckle on the left. This then concentrated stress on both sides of the buckle, allowing the other bends to form.” In areas of the world with diverse temperature variations (particularly summer heat) such as that found in the western United States and Australia, this type of buckling is not that unusual. The rails will expand when warmed if they are laid during colder weather and that forces the extra rail to move sideways. Rails are usually laid in warmer weather so that it won’t “sun-kink.” "The farmer at this site very kindly allowed us to enter his field ... where the array of cracks, and associated deformation, is astonishing. GNS have an aerial view of the field." from this blog
标签: 新西兰地震
