People living in the Himalayas are more vulnerable to earthquakes because-
1. Himalayan mountain ranges are formed as a result of collision of IndoAustralian plate and Eurasian plate.
2. According to plate tectonic theory, Indo-Australian plate (on which India lies) is moving towards north and is subducting under Eurasian plate.
3.This movement obviously cause friction between two plates.
4.Thus, these regions are more prone to earthquakes.