Arrange the longitudinal fault lines of the Himalayas from south to north.

A. Himalayan Frontal Fault (HFF)
B. Main Boundary Thrust (MBT)
C. Indus-Tsang Po Suture Zone (ITSZ)
D. Main Central Thrust (MCT)

Choose the correct answer from the options given below:

Correct option is B

The fault lines of the Himalayas are arranged from south to north in the following sequence:

1. Himalayan Frontal Fault (HFF) (A) – Located in the southernmost part, separating the Himalayas from the Indo-Gangetic plains.
2. Main Boundary Thrust (MBT) (B) – Lies north of the HFF, marking the transition between the Lesser Himalayas and the Siwaliks.
3. Main Central Thrust (MCT) (D) – Found further north, it separates the Lesser Himalayas from the Greater Himalayas.
4. Indus-Tsang Po Suture Zone (ITSZ) (C) – The northernmost fault, marking the boundary between the Indian Plate and the Eurasian Plate in the Tibetan region.

Thus, the correct sequence is HFF → MBT → MCT → ITSZ (A → B → D → C).

Information Booster:

• The Himalayan orogeny (mountain-building process) was caused by the collision of the Indian Plate with the Eurasian Plate.
• HFF (Himalayan Frontal Fault) is an active fault line causing major earthquakes in the Himalayan region.
• MBT (Main Boundary Thrust) defines the boundary between the Siwalik Hills and the Lesser Himalayas.
• MCT (Main Central Thrust) is a major fault zone that marks the boundary of Lesser and Greater Himalayas.
• ITSZ (Indus-Tsang Po Suture Zone) is the collision zone where the Indian Plate meets the Eurasian Plate.