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Abstract Urban land subsidence is widespread, yet a global assessment using a consistent methodology is lacking, limiting targeted adaptation and mitigation. Here we use satellite interferometric synthetic aperture radar data from 2014 to 2023 to produce high-resolution relative local land subsidence maps for 465 cities worldwide with populations exceeding one million.
4.1. Cracked HSB When the bolt is shaken violently or under frequent vibration, the thread that is tightly engaged will produce tiny gaps or even deformation. Crack is a common damage. The position, number and depth of crack distribution will have a certain influence on the mechanical properties of HSB. From the previous chapter, it can be found that the position of the first few circles of the thread is prone to stress concentration.
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