Researchers at Nanyang Technological University (NTU) in Singapore found that massive earthquakes can cause the ground to sink for years [1].

This discovery is critical for coastal urban planning because land subsidence alters regional sea-level projections and increases the accuracy of flood-risk assessments for low-lying cities [1, 2].

The study focused on the long-term effects of the 2004 Sumatra earthquake. Researchers observed that this specific seismic event triggered gradual land subsidence across Singapore, Malaysia, and Thailand [1]. These effects were detected thousands of kilometers away from the earthquake's epicentre [1].

While some regions experience land sinking due to groundwater extraction or glacial adjustments, the NTU findings highlight a different seismic driver. The research indicates that the impact of a major quake is not limited to the immediate area of rupture; it can influence the stability of the earth's crust over a vast geographic range [1, 2].

By understanding how post-earthquake subsidence works, scientists can better predict how the coastline will change over decades. This data allows engineers and policymakers to adjust infrastructure projects to combat rising waters more effectively [1, 2].

“Massive earthquakes can cause the ground to continue sinking for years.”

The research shifts the understanding of seismic risk from immediate destruction to long-term environmental change. By proving that distant landmasses can sink following a major quake, the study suggests that sea-level rise is not just a result of melting ice or warming oceans, but also the physical descent of the land itself. This requires a multi-disciplinary approach to coastal defense that integrates seismology with climate science.