The UNESCO Land Subsidence International Initiative (LaSII) enhances the scientific understanding and technical knowledge required to identify and characterize hazards related to natural and anthropogenic land-level lowering.

LaSII promotes and facilitates the international exchange of information regarding the design, implementation and evaluation of risk assessments and mitigation measures, and the definition of resource-management strategies that support sustainable development in areas vulnerable to land-level lowering.


November 17, 2023 / subsidence

6th National Chinese Symposium on Land Subsidence

The 6th National Symposium on Land Subsidence (SNSOLS) was successfully held on November 8-11, 2023 in Beijing, China. The symposium…
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April 26, 2023
All 82 oral presentation of the 10th International Symposium On Land Subsidence have been uploaded to our YouTube channel! We…
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February 3, 2023 / landslide, subsidence
Santiago de Chile’s metropolitan region is located in one of the most seismically active subduction zones worldwide, making the area…
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January 27, 2023 / groundwater withdrawal, subsidence
Mitigation of human-induced land subsidence starts with the regulation of resource extractions. Harris-Galveston Subsidence District (coastal Texas, U.S.A.) is worldwide one of…
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Latest Events

The 10th International Symposium on Land Subsidence took place in Delft–Gouda, the Netherlands from 17 – 21 April 2023. The symposium is organised under the auspices of LaSII. 

Land subsidence is a major problem that threatens the viability and sustainable economic development for millions of people throughout the world, especially in (but not restricted to) highly urbanized coastal areas. It is often a result of overexploitation of groundwater resources. The total costs globally amount up to many billions of dollars annually.

Upcoming Events

We announce that the 11th International Symposium on Land Subsidence (EISOLS) will take place in Spring 2026 at the Taipei International Conference Center (Taiwan).