Explanation:

Active Faults of the Himalayas :

• The frontal zone of the Himalaya is most active at present.
• The geology of the Himalayas on its southern side is characterized by three major tectonic units: The Main Central Thrust (MCT), the Main Boundary Thrust (MBT) and the Himalayan Frontal Thrust (HFT) or the Main Frontal Thrust (MFT).
• These structures essentially separate the different rocky formations that characterize the different stages of the Himalayan outcrop—the higher Himalayas, the lesser Himalayas, and the sub-Himalayan Shivalik range.
• The highest and the oldest of these is the MCT, which is a north-dipping fault and marks the tectonic contact between the higher and the lesser Himalayas.
• The lesser and the sub-Himalayas are separated by the MBT.
• The HFT or the MFT constitutes the southern-most and the youngest thrust.