Earth Fissures in Su–Xi–Chang Region, Jiangsu, China

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• 作者：Guang-ya Wang ; Greg You ; Jin-qi Zhu ; Jun Yu ; Wei Li
• 关键词：Earth fissure ; Geological investigation ; Geophysical survey ; Groundwater extraction ; Su–Xi–Chang (SXC)
• 刊名：Surveys in Geophysics
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：37
• 期：6
• 页码：1095-1116
• 全文大小：7,047 KB
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geophysics and Geodesy
  Geosciences
  Astronomy
  
• 出版者：Springer Netherlands
• ISSN：1573-0956
• 卷排序：37

文摘

The earth fissures in the Su-Xi-Chang area are caused by differential land subsidence due to long-term excessive groundwater withdrawal and controlled by the bedrock ridge or cliff underlying. There have been more than 15 earth fissures in the area since 1989. The field investigations have lasted for more than 20 years. The earth fissures generally have a main fissure and a number of secondary ones parallel to the main one. The main fissure (crack) has a scarp, is steeply dipping, and can be more than 2000 m long. Geophysical surveys (2D or 3D seismic investigation, controlled source audio frequency magnetotelluric sounding, and electric sounding) combined with geological drilling are effective for the investigation of earth fissures. Geodetic leveling is effective to monitor the ground deformation across the earth fissure, so is the extensometer for the opening of the fissure. The activities of earth fissures are directly related to different stages of land subsidence and controlled by geological abnormalities. Most earth fissures in the area are still active.