Probable risk estimation due to reservoir induced seismicity at Jamrani dam Project, Kumaon Himalaya, India

  • V. K. Sharma


A lake of about 4.5 sq. km. spread having 208 millions cubic meter storage capacity is proposed to be created in outer Himalaya for meeting irrigation, industrial and domestic supplies, downstream of 130 m high Jamrani dam.

The bedrock around the lake consists of alternate bands of sandstone, clayshale and siltstone of siwalik Formations, (Middle Miocene to Pliocene) and thrust mass of Amritpur granite. The tectonic plane (Main Boundary fault) lies about 3.5 km upstream of the dam.

The problem of Reservoir Induced Seismicity (RIS) though complex and unpredictable has been studied the world over at several major dam projects which provide some information on the factors responsible for RIS such as (i) geo-tectonic, setting (ii) pore-water pressure (iii) background seismicity and (iv) reservoir water load. Any one or the combination of these factors play an important role in inducing, earthquakes. The subject of RIS has been discussed in the light of the analysis of the seismic risk related to Jamrani reservoir in its geo-tectonic setting.


Background Seismicity Maximum Effective Stress Main Boundary Fault Reservoir Induce Seismicity Reservoir Seismicity 

Estimation du risque de séismicité induite par le réservoir sur le site du Barrage de Jamrani, Kumaon Himalaya, Inde


On se propose de créer un lac d'environ 4,5 km2, d'une capacité de 208 millions de m3 en bordure de l'Himalaya, pour l'irrigation et les besoins domestiques et industriels. Cette retenue serait liée au barrage de Jamrani, d'une hauteur de 130 m.

Le substratum autor du lac est constitué de bancs de grès, de schistes argileux et de pélites en alternance appartenant à la formation de Siwalik (Milieu Eocène → Pliocène) et de granite appartenant au massif intrusif d'Amritpur Un plan de faible majeur se situe, 3,5 km en amont du barrage.

Le problème de la seismicité induite par les réservoirs, a été étudié dans le monde entier à l'occasion de plusieurs projets de barrages importants, et l'on connait les facteurs responsables de la séismicité induite, les principaux étant (1) le contexte géostructural (2) la pression de l'eau interstitielle, (3) la seismicité ambiante, (4) le volume d'eau contenu dans le réservoir n'importe lequel de ces facteurs ou la combinaison de plusieurs d'entre eux peuvent induire des tremblements de terre. L'article traite de ces problèmes appliqués au réservoir de Jamrani dans son contexte géostructural.


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© International Association of Engineering Geology 1995

Authors and Affiliations

  • V. K. Sharma
    • 1
  1. 1.Geological Survey of IndiaLucknowIndia

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