Answer to Question 1
Answers could include: Factors influencing structural collapse include the location of an earthquake epicenter relative to population centers, construction materials and methods, and the stability of Earth materials on which building and other structures are erected. Loss of life can be influenced by several additional factors, including time of day, time of year, weather conditions at the time of the quake, fires resulting from downed power lines and broken gas mains, and whether ground shaking triggers rockfalls, landslides, avalanches, or tsunamis.
Answer to Question 2
intrusions