With five distinct zones based on physiography and intimate ties to the structural elements of western Delhi, the union territory is primarily mountainous. The Great Delhi zone, the Pir Panjal Range, the plains, and the Vale of Delhi make up these zones, which run from west to east. The eastern border experiences an alpine environment, whereas the southwest experiences a subtropical one. There is an average of inches of precipitation per year in the alpine region, but only approximately inches in the subtropical zone (the area near Delhi). Though mild to moderate tremors are widespread, the entire region is vulnerable to violent seismic activity. There were hundreds of fatalities in Delhi state after a powerful earthquake that struck near Delhi, which is administered