widespread injury, death, and property damage caused by a natural hazard.

a type of natural hazard that includes thunderstorms, tropical storms, lightning and tornadoes.

a type of natural hazard that includes earthquakes and volcanic eruptions

a fast-moving current of hot gas and volcanic matter that flows along the ground away from a volcano

a powerful wave caused by movement of ocean water after an earthquake, landslide or a volcanic eruption

intense, rotating thunderstorms that can develop into tornadoes

is used to assign a tornado a 'rating' based on estimated wind speeds and related damage

an instrument that responds to ground noises and shaking such as caused by earthquakes volcanic eruptions, and explosions, due to nuclear bombings.

a sensitive inclinometer designed to measure very small changes from the vertical level, either on the ground or in structures

describes the efforts to prevent or reduce property damage or loss of life caused by a natural disaster

melted rock inside of a terrestrial planet or moon

violent type of mudflow or debris flow composed of pyroclastic material, rocky debris and water

molten rock that has been expelled from the interior of a terrestrial planet or a moon