Category Nuances for major_earthquake:

• catastrophic,
• natural,
• external,
• dangerous,
• environmental,
• under,
• economic,
• geological,
• real,
• extreme,
• severe,
• tectonic,
• seismic,

Simple Categories for major_earthquake:

• hazard,
• catastrophe,
• thing,
• activity,
• situation,
• condition,
• shock,
• disturbance,