Calcutta is located near the Arakan-Yoma subduction zone.

 Seismic sources near Kolkata

Kolkata, although not on a seismic fault, is not immune to seismic hazards. The metropolis lies on the border of seismic zones III and IV, which indicate moderate to high seismic hazards.

Kolkata is located near seismic zones.

The Shillong Plateau is capable of producing large earthquakes, such as the Assam earthquake of June 12, 1897, which killed over 1,500 people. The earthquake was felt across British India from Burma to Peshawar. It also caused widespread damage in Kolkata.

The second zone is the Calcutta-Mymensingh Hinge Zone, which is located about 4.5 km below Kolkata and extends to Mymensingh in Bangladesh.  This zone intersects with the Jamuna Fault, which triggered the 1885 Mymensingh earthquake that caused severe damage in the Mymensingh, Jamalpur and Sherpur regions of British Bengal and also affected Kolkata.

The Arakan-Yoma subduction zone is a region where the Indian Plate is subducting beneath the Burma Plate. Kolkata is located near this region.

Kolkata is located south of the Himalayas in Nepal and Sikkim, where the Indian Plate is subducting beneath the Eurasian Plate. This causes regular tremors in the city.