Technological disasters
Situations in which large numbers of people, property, infrastructure, or economic activity are directly and adversely affected by major industrial accidents, severe pollution incidents, nuclear accidents, air crashes (in populated areas), major fires, or explosions.

Temporal probability
The probability that the element at risk is in the area affected by the danger (threat) at the time of its occurrence.

Tolerable risk
regarded as non-negligible and needing to be kept under review and reduced further if possible.

Topple
A forward rotation of a mass of rock, debris or soil about a pivot or hinge on a hillslope. The toppling may culminate in an abrupt falling or sliding, but the form of movement is tilting without collapse. Toppling involves overturning of interacting columns. Such blocks are formed by irregular bedding planes, cleavages, joints or tension cracks which strike approximately parallel to the slope crest or dip out of the rock mass.

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