1. Geographic location: Mexico City is located in the Trans-Mexican Volcanic Belt, a region with a high level of seismic and volcanic activity. This belt is characterized by the meeting of three tectonic plates: the North American Plate, the Pacific Plate, and the Cocos Plate, which results in intense geological activity in the region.
2. Soft soil: Mexico City is built on top of a former lake bed, which is made up of soft, loose soil that amplifies the effects of seismic waves during an earthquake. This soil type further increases the vulnerability of the city to earthquakes.
3. High population density: Mexico City is one of the most populous cities in the world, with a population of over 20 million people. The high population density makes the city particularly vulnerable to the impacts of seismic and volcanic activity, as it increases the potential for casualties and damages.
4. Urban development: Mexico City has experienced rapid urbanization and development over the past century, leading to the construction of many buildings and infrastructure that may not be adequately designed to withstand seismic and volcanic events. Poorly constructed buildings and inadequate infrastructure can further exacerbate the city's vulnerability to seismic and volcanic activity.