What causes the ground beneath us to slowly rise or sink?

Introduction

The ground beneath us can slowly rise or sink over years, decades, or centuries. These gradual changes—called uplift and subsidence—result from a mix of natural Earth processes and human activities. Understanding what causes them helps explain changing coastlines, damaged buildings, and shifting groundwater levels.

What do we mean by ground uplift and subsidence?

Uplift refers to the slow upward movement of the Earth’s surface, where land becomes higher relative to a previous position. Subsidence is the opposite: the surface moves downward and appears to sink. Both are measured in millimeters to meters and may be temporary or long-term.

Measurements come from geological field observations, leveling surveys, GPS, and satellites such as InSAR (Interferometric Synthetic Aperture Radar), which can detect very small vertical motions across large areas.

Main natural causes

Tectonic forces

Large-scale motions of the Earth’s lithospheric plates drive uplift and subsidence. Where plates collide, compressional forces can crumple and thicken the crust, producing mountain uplift over millions of years (for example, the Himalayas). Where plates diverge or where crust is stretched, the surface can drop, creating rift valleys or basins.

Earthquakes and slow slip on faults can also produce sudden jumps in elevation or slower, ongoing deformation that changes land height over years.

Isostatic adjustment

Isostasy is the gravitational balance between the Earth’s crust and the denser mantle beneath it. When weight on the crust changes, the crust responds by rising or sinking to restore balance. Two common examples:

Glacial isostatic adjustment: During ice ages, massive ice sheets depress the crust. When the ice melts, the crust slowly rebounds upward over thousands of years. Parts of Scandinavia, Canada, and Greenland are still rising today as a result.

Post-glacial loading from sediment or water: Large deltas or reservoirs add weight that can cause local sinking; removal of weight (erosion or drained reservoirs) can lead to uplift.

Volcanic and magmatic processes

When magma accumulates in crustal chambers, the surface can bulge upward. Conversely, when magma or hydrothermal fluids are withdrawn or erupt, the ground above a chamber may collapse or subside. These changes can be gradual or rapid, depending on the balance of input and output of magma and fluids.

Examples include inflation (uplift) of volcanoes prior to eruption and caldera collapse (subsidence) after large eruptions.

Sediment compaction and natural consolidation

Soft, water-saturated sediments—like those in river deltas, coastal plains, or lake beds—compact over time as new layers build on top. Compaction squeezes water out of the pore spaces, reducing volume and causing the surface to sink. This is a slow, natural process but is accelerated by added loads or fluid extraction.

Hydrological and groundwater changes

Seasonal or long-term changes in groundwater, soil moisture, and surface water can alter ground elevation. When pore water pressure is high, soils can be more buoyant; when water is removed, soils may consolidate and subside. In some clay-rich soils, drying and shrinking can lower the surface seasonally.

Conversely, increased groundwater or heavy rainfall may temporarily raise shallow soils by adding weight and pore pressure, though permanent uplift from this is uncommon.

Sea-level and shoreline processes

Relative sea-level change is the combination of actual ocean level changes and local vertical motions. Coastal areas appearing to sink relative to sea level may be experiencing subsidence, global sea-level rise, or both. Conversely, coastal uplift—driven by tectonics or isostatic rebound—can make formerly submerged areas rise above sea level.

Human causes of uplift and subsidence

Groundwater, oil, and gas extraction

Pumping large volumes of fluid from underground reduces pore pressure and allows sediments to compact. This compaction can cause measurable subsidence over urban and agricultural areas. Famous examples include subsidence in cities built on deltaic sediments and areas of California’s Central Valley that sank after heavy groundwater withdrawal.

Mining and underground cavities

Underground mining removes solid material and creates voids. If voids are not properly backfilled, roof collapse can lead to localized subsidence—sometimes sudden, sometimes gradual. Coal mine subsidence, for instance, has damaged buildings and infrastructure in many regions.

Drainage and land reclamation

Drying peatlands, drained wetlands, and reclaimed coastal lands commonly lose volume through oxidation and compaction. Peat and organic soils exposed to oxygen decompose and shrink, causing substantial long-term subsidence. This process has caused parts of the Netherlands and Indonesia to sink in recent decades, increasing flood risk.

Large buildings, reservoirs, and artificial loading

Construction that concentrates large loads—tall buildings, heavy infrastructure, or reservoirs—can cause local settlement if the underlying soils compress under the added weight. Reservoir filling can also induce subsidence through both the added load and by changing pore pressures in nearby rocks.

Urbanization and paving

Widespread paving and changes to natural drainage can alter how water infiltrates the ground, affecting soil moisture and stability. While this does not directly raise or lower broad areas as dramatically as extraction or compaction, it can influence localized settlement and long-term soil behavior beneath structures.

How scientists measure and study vertical land movement

Understanding uplift and subsidence requires measurements over time. Several common methods are:

Leveling surveys: Traditional ground-based measurements between benchmarks can detect centimeter-scale changes over decades.

GPS and GNSS: Modern satellite positioning provides continuous, precise three-dimensional motions of the surface at monitoring stations.

InSAR (satellite radar): Interferometric radar compares radar images taken at different times to map millimeter- to centimeter-scale vertical changes across wide areas.

Borehole extensometers and tiltmeters: Instruments installed in boreholes measure subsurface compaction and tilt related to fluid extraction, loading, or magmatic processes.

Geological records: Sediment layers, raised beaches, and peat records reveal long-term uplift or subsidence histories over centuries to millennia.

Consequences and real-world examples

Coastal flooding and increased flood risk

Subsidence amplifies the effects of sea-level rise: a sinking coastline sees water encroach faster. Cities built on deltas or soft sediments—such as Jakarta, New Orleans, and parts of the Mekong Delta—face compounded risks from both global sea-level rise and local subsidence.

Damage to buildings and infrastructure

Uneven or differential settlement can crack foundations, warp roads, and strain pipelines. In mining areas or regions with variable soil compaction, infrastructure maintenance costs rise and hazard risks increase.

Ecological impacts

Sinking wetlands and peatlands can lose habitat and carbon storage capacity. Conversely, uplifted areas can change drainage patterns and the distribution of plant communities. These ecological shifts may be slow but have lasting consequences for biodiversity and carbon cycles.

Opportunities for scientific insight

Uplift patterns reveal tectonic and mantle processes; monitoring subsidence helps manage groundwater and land use. For example, measuring post-glacial rebound helps scientists learn about the viscosity of Earth’s mantle, while observing reservoir-induced subsidence informs engineering design and water management policies.

What can be done to manage or reduce harmful subsidence?

Addressing subsidence depends on the cause. Broad approaches include better monitoring, limiting extraction of groundwater and hydrocarbons, and engineering solutions where needed.

Controlled groundwater and resource management: Regulating pumping rates, recharging aquifers artificially when appropriate, and switching to less consumptive water sources can reduce compaction in vulnerable areas.

Adaptive building and infrastructure design: Foundations and utility lines can be engineered to tolerate some settlement, and flexible joints can reduce damage. Land-use planning can avoid constructing critical infrastructure on highly compressible soils when possible.

Wetland and peatland protection: Maintaining water tables in peatlands and stopping drainage can slow oxidation and compaction. Restoring natural hydrology in wetlands can stabilize ground levels and preserve ecosystem services.

Mine planning and reclamation: Proper backfilling, monitoring, and post-mining land management reduce the risk of collapses and long-term subsidence.

Distinguishing similar concepts: subsidence, erosion, and uplift

Subsidence is vertical lowering of the land surface due to internal processes such as compaction or removal of support. Erosion is the removal of soil and rock at the surface by water, wind, or ice; it lowers the land because material is physically carried away. Uplift is vertical rising of the surface due to internal forces like tectonics or isostatic rebound. Erosion changes the surface by taking material away, while subsidence is often an internal volume loss or support change.

When should you be concerned?

Most slow uplift or subsidence is natural and not immediately hazardous. Concern grows when the movement is rapid, uneven, or affects infrastructure, property, or flood risk. Signs to watch for include new or widening cracks in walls and roads, doors and windows jamming, sudden ponding of water, or increased coastal flooding frequency.

If you live in an area with known subsidence risks—deltas, reclaimed lands, peatlands, or active mining districts—local authorities or geological surveys often provide guidance and monitoring data. For property concerns, qualified geotechnical professionals can assess foundation stability and recommend mitigation.

Further reading and reliable sources

For readers who want to dig deeper, national geological surveys, university geology departments, and international organizations (such as the United States Geological Survey, the British Geological Survey, and peer-reviewed geoscience journals) publish accessible reports and maps describing local uplift and subsidence patterns and their causes. Satellite missions and remote-sensing centers also publish regional InSAR studies useful for visualizing recent ground motion.

Conclusion

Ground uplift and subsidence result from a range of natural and human factors: tectonics, isostatic rebound, magmatic activity, sediment compaction, groundwater and resource extraction, and land-use changes. The processes operate over different timescales and spatial scales, and their effects matter for coastal safety, infrastructure, ecosystems, and scientific research. Monitoring, sensible resource management, and thoughtful engineering can reduce the most harmful consequences.