Dictionary of Geotourism

2020 Edition
| Editors: Anze Chen, Young Ng, Erkuang Zhang, Mingzhong Tian

Xi’an Ground Crack

Reference work entry
DOI: https://doi.org/10.1007/978-981-13-2538-0_2808

This term refers to the cracks that are exposed on the ground surface in Xian. Their total length exceeds 40 km, and they cover an area of 150 km2. Their emergence and development have the following characteristics: (1) The movement on the cracks migrated. The cracks in the southern suburb formed first and then migrated north. (2) The movement is cyclical. The first peak period was in the 1920s and 1930s, the second peak was in the 1950s and 1960s, and the third was in the mid-1970s. Since 1985, more frequent cracking has occurred in the northern and northeast suburbs. (3) The cracking is mainly tensional, but it is accompanied by vertical faulting and horizontal twisting. During the peak movement periods, the vertical movement can reach velocities of a few mm to 20 mm per year. (4) The movements are destructive to buildings. Recent studies suggest that the development and movement of the cracks are controlled by a deep fault and are also closely related to the excessive exploitation...

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