Subsidence

A gradual settling or sudden sinking of the Earth's surface due to removal or displacement of subsurface earth materials (National Oceanic and Atmospheric Administration 2021)
 

Sources

National Oceanic and Atmospheric Administration. 2021. “What Is Subsidence?” National Ocean Service. 2021. https://oceanservice.noaa.gov/facts/subsidence.html.
 

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Introduction

Land subsidence is a global phenomenon and is defined as:

“a gradual settling or sudden sinking of the Earth's surface due to removal or displacement of subsurface earth materials”  - National Oceanic and Atmospheric Administration (2021)