Medog Dam Risks Include Seismic Instability and Geopolitical Conflict
“Limitations: 1.Geological and Seismic Instability The project is located in the Eastern Syntaxis of the Himalayas, the point where the Indian and Eurasian tectonic plates collide with the greatest intensity. Earthquake Risk: The region is highly seismically active (site of the 1950 Assam-Tibet 8.6 magnitude earthquake). Large-scale dams can trigger Reservoir-Induced Seismicity (RIS), where the weight of the water creates tremors that could lead to a catastrophic dam failure. Landslides and GLOFs: The Yarlung Zangbo Grand Canyon is prone to massive landslides and Glacial Lake Outburst Floods (GLOFs). In 2021, a glacier collapse temporarily blocked the river; a dam in this path would be vulnerable to "overtopping" waves caused by such landslides.Transboundary Geopolitical Conflict Because the Yarlung Zangbo is an international river, the Medog dam is viewed as a "water bomb" by downstream nations. Hydro-Hegemony: India and Bangladesh fear that China could unilaterally control water flow—withholding it during droughts or releasing it during floods as a strategic tool of war. Lack of Treaties: There are no formal water-sharing treaties between China, India, and Bangladesh. This lack of transparency leads to constant diplomatic friction and "tit-for-tat" dam building in the region.”
Summary
The Medog dam is being built in a highly seismic zone of the Himalayas, and experts warn that reservoir‑induced seismicity and earthquake risk are real concerns. The canyon’s steep terrain makes landslides and glacial‑lake outburst floods a significant hazard. Downstream India and Bangladesh view the project as a strategic water‑security threat, and there is no formal water‑sharing treaty among the three countries, leading to diplomatic tension.
Sources 79 searched
- USGS - Review of seismic-hazard issues associated with the Auburn Dam project, Sierra Nevada foothills, California
U.S. Geological Survey Open File Report 96-0011 · RESERVOIR-INDUCED SEISMICITY The potential for reservoir-induced seismicity, which is the triggering of earthquakes by the physical processes that accompany the impoundment of large reservoirs, was recognized during the seismic hazard studies ...
- Stress transfer patterns and local seismicity related to reservoir water-level variations. A case study in central Costa Rica - PMC
While the Pirrís dam is characteristic of a medium-sized reservoir, which is probably not as large as other more significant dams with proven RTS around the world, different aspects related with the number, type and quality of the data, together with its specific geological environment, make this reservoir a special case for analysing possible induced or triggered seismicity due to reservoir filling.
- China starts building world's largest dam, fuelling fears in India
The dam is on a Tibetan river that flows into India and Bangladesh, and could affect millions downstream.
- China’s Large and Mysterious Dam Project Is Alarming Neighbors and Experts (Published 2025)
To this day, the Indian plate is still slowly moving toward the Eurasian one, which is why the Himalayas are regularly hit by earthquakes. Such seismic events threaten the safety of dams.
- Reservoir-Induced Seismicity - an overview | ScienceDirect Topics
Such earthquakes occur in conjunction with the impoundment of water or rapid water level changes behind large dams (Gupta and Rastogi, 1976). The phenomenon of earthquake occurrence may be the gravitational imbalance due to the addition of water in the reservoir. The filling of water in the reservoir enhances the amount of pressure in that area. The more likely explanation for reservoir induced seismicity is the increase of pore pressure because of the hydrostatic head of the reservoir.
- Revisiting the reservoir-triggered seismicity of Koyna India using near-source seismological observations and relationship with reservoir water level changes - ScienceDirect
Studies in the Koyna-Warna region have demonstrated that large annual water level fluctuations due to rapid filling rates of the Koyna-Warna reservoirs lead to significant pore pressure changes, which in turn trigger seismic events along pre-existing faults and fracture networks in the area (Gupta, 2002a, Gupta, 2002b; Talwani, 1997). The Koyna-Warna studies highlight the importance of considering the interplay between reservoir water loading, pore pressure diffusion, and pre-existing geological structures in understanding RTS. The interplay between hydromechanical processes and fault mechanics emphasizes the complex nature of fluid-induced seismicity, where subtle variations in pore pressure can significantly impact regional stress fields and trigger seismic events (Gahalaut, 2021).
- On the possibility of reservoir-induced seismicity in the Garhwal Himalaya - ScienceDirect
It is argued from a brief review of available evidence that the possibility of reservoir-induced seismicity (RIS) in the Himalaya as a whole cannot be ruled out at the present time.
- (PDF) Possibility of Induced Seismicity in Pancheshwar Dam Site on Kali River, Uttarakhand
The chlrorite-sericite schist developed within shear zones may accommodate the ongoing convergence of Indian plate towards Himalaya in the form of shear strain in the subsurface region. This accumulated strain may cause gravity collapse along steeply dipping shear planes. Thus the reservoir-induced seismicity may be one of the consequences of active deformation prevailing in the region.
- Medog Hydropower Station - Wikipedia
Jogendranath Sharma, a geologist, warned that the project, located in a seismically active region, poses serious risks to downstream Assam—including erosion, ecological disruption, and potential disaster in the event of an earthquake—urging a joint Indo-China environmental impact assessment.
- Méga-barrage au Tibet : un rêve de grandeur pour la Chine, un cauchemar pour l’Inde et le Bangladesh - France 24
Mais c’est aussi un pari très risqué pour Pékin. D’abord parce que le site de ce futur complexe hydraulique se situe dans une zone très sismique, ce qui fait de ce chantier “l’un des plus dangereux du monde”, affirme le site Engineering News-Record.
- Barrage de Medog — Wikipédia
Il est prévu la construction de ... les turbines hydrauliques reliées à des générateurs avant de retourner dans le cours du fleuve. En décembre 2024, les autorités chinoises ont validé la construction du barrage de Medog....
- Le fleuve Yarlung et son projet de méga-barrage
D'une part, elle produit déjà beaucoup d'énergie hydroélectrique, et d'autre part, ce méga-barrage pose des défis techniques majeurs. En effet, le site se situe dans un canyon très profond, sur une zone à forte activité sismique, instable, sujette aux glissements de terrain.
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