Tripura High

Tripura High indicates relatively greater gravity survey data at Tripura as compared to her neighbouring areas. The word 'High' is commonly used in connection with gravity survey to define an anomaly in a given area that is relatively greater than those in neighbouring areas. The bengal basin is divided into a number of crustal blocks with differential movements producing uplifts (highs) and areas of subsidence (lows). This name 'Tripura High' has been used in a recent publication on the Geology of Bangladesh book. Major part of the area lies beyond the Bangladesh territory and is occupied by the tripura hills. The Tripura Hills, having N-S trend, lie in the middle part of the Tripura-Chittagong Folded Belt. This folded belt is the eastern limit of the Bengal Basin. Regional gravity survey shows a basement rise in the Tripura area but no detail geophysical data is available in the published literature to infer its structural characteristics. On its north lies the Surma Basin and on the south lies Hatiya Trough. A number of anticlines forming north-west-frontal part of the Tripura High fall within the Bangladesh territory. These are Habiganj, Rashidpur, Maulvi Bazar, Batchia, and Harargaj anticlines from the west to the east. [AKM Khorshed Alam]