The epicenter of the 2015 Nepal earthquake was located just 15 kilometers (9 miles) beneath the surface of the earth. This shallow depth meant that the energy from the earthquake was released very close to the surface, resulting in more violent shaking. In contrast, earthquakes that occur deeper underground have less of an impact because the energy is dissipated over a larger area.

2. Complex geology

The area where the earthquake occurred is known as the Himalayan thrust belt, a complex region where the Indian Plate is colliding with the Eurasian Plate. This collision has created a series of faults and folds in the rock layers, which made them more likely to rupture during the earthquake. Additionally, the rocks in this region are relatively weak and fractured, which made them more susceptible to damage.

3. Densely populated area

The epicenter of the earthquake was located near the capital city of Kathmandu, a densely populated area with over 1 million people. The close proximity of the epicenter to the city meant that a large number of people were exposed to the violent shaking. Additionally, many of the buildings in Kathmandu were not designed to withstand strong earthquakes, resulting in widespread collapse and damage.

4. Poor construction practices

Many of the buildings in Nepal were constructed with poor-quality materials and substandard engineering practices. This made them more vulnerable to damage during the earthquake. Additionally, many of the buildings were located in areas that were prone to landslides, which further increased the risk of damage.

5. Lack of emergency preparedness

Nepal was not well-prepared for an earthquake of this magnitude. The country lacked adequate building codes and emergency management plans. Additionally, many people were not aware of the risks associated with earthquakes and did not know how to respond in the event of one.

6. Aftershocks

Following the main earthquake, there were hundreds of aftershocks, some of which were themselves powerful enough to cause significant damage. These aftershocks continued to rattle the region for weeks and months after the initial earthquake, making it difficult for people to recover and rebuild.

The combination of these factors contributed to the devastating impact of the 2015 Nepal earthquake. The shallow epicenter, complex geology, densely populated area, poor construction practices, lack of emergency preparedness, and aftershocks all played a role in causing widespread damage and loss of life.