What is the greatest cause of human injury and deaths with earthqaukes?

The greatest cause of human injury and death during earthquakes is often structural collapse, primarily due to poorly constructed buildings and infrastructure. When seismic waves shake the ground, inadequately designed structures can fail, leading to falling debris and entrapment of occupants. Additionally, secondary effects such as tsunamis, landslides, and fires can exacerbate the situation, increasing the overall risk to human life. Effective engineering standards and preparedness can significantly mitigate these risks.