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Soil subsidence on Java’s north coast advances up to 1.5 meters per decade, raising flood risk for over 75% of the region by 2050, according to a Columbia University study.
Rapid soil subsidence on the north coast of Java island is exacerbating flood risks more intensely than sea level rise. With up to 1.5 meters of subsidence per decade, this reality threatens the lives of 150 million people in one of the planet’s most densely populated regions.
A study published in 2026 by Science Advances, with data collected by satellite and artificial intelligence, reveals that up to 85% of the relative sea level rise by 2050 in Java will be a consequence of land subsidence, mainly caused by groundwater extraction and intensive land use.
Subsidence Dominates Flood Risk in Java by 2050
Soil subsidence on Java’s north coast is occurring at an alarming rate, up to 1.5 meters per decade, far exceeding sea level rise in the region. This phenomenon exacerbates flood risks for approximately 150 million people, becoming the main driver of the relative sea level rise expected by 2050.
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Over 75% of Java’s coast faces a high risk of floods caused by subsidence in the next 25 years. The combination of intensive groundwater extraction, agricultural and industrial land use, and sediment compaction directly contributes to land sinking.
The impact of subsidence is more critical than that of sea level rise, despite global climate effects. Cities such as Jakarta, Cirebon, Semarang, and Surabaya are at the epicenter of this problem, which demands urgent attention to prevent disasters in one of the world’s most densely populated urban areas.
Human Activities Accelerate Land Sinking in Urban and Rural Areas
Soil subsidence on the north coast of Java island reaches up to 1.5 meters per decade in urban and rural areas, drastically worsening the risk of floods. Intensive groundwater extraction, agricultural and industrial land use, and sediment compaction are identified as the main causes of this accelerated sinking.
Over 75% of Java’s coast faces the threat of flooding caused by subsidence in the next 25 years, an alarming rate that surpasses the impact of sea level rise itself. Densely populated cities such as Jakarta, Cirebon, Semarang, and Surabaya are among the most affected.
This combination of human factors drives a relative sea level rise caused by up to 85% by land sinking, highlighting the importance of monitoring and understanding human actions that intensify these climate risks in the region.
Devastating Impacts Predicted for Cities like Jakarta, Semarang, and Surabaya
Soil subsidence on Java’s north coast is causing severe impacts in major cities such as Jakarta, Semarang, and Surabaya. In these areas, sinking can reach up to 1.5 meters per decade, drastically increasing the risk of floods.
Over 75% of this region’s coast faces a high threat of flooding in the next 25 years, with land sinking responsible for up to 85% of the relative sea level rise predicted by 2050. Intensive groundwater extraction, agricultural, and industrial activities are the main causes of this phenomenon.
These conditions exacerbate existing urban vulnerabilities, straining infrastructure and threatening the safety of approximately 150 million inhabitants in one of the planet’s most densely populated areas.
Urgent Need for Monitoring and Adaptation to Contain Emerging Crisis
Soil subsidence on Java’s north coast reaches up to 1.5 meters per decade, surpassing sea level rise and posing a critical risk to over 150 million local inhabitants. The problem is mainly caused by intense groundwater extraction and extensive land use for agriculture and industry, accelerating sinking in urban and rural areas.
Over 75% of Java’s coast will be under high risk of floods caused by land sinking in the next 25 years. This relative sea level rise, driven by subsidence, demands urgent attention for rigorous monitoring of the situation.
Data indicates that up to 85% of relative sea level rise by 2050 will be a product of subsidence, highlighting the need to focus adaptation measures not only on rising waters, but on controlling land subsidence to contain the emerging crisis in Java’s coastal region.
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