What distinguishes a V-shaped pattern from a U-shaped pattern in fire investigation?

A V-shaped pattern is characterized by sharp lines of demarcation that indicate the direction of the fire's spread. This pattern often arises when a fire has traveled upward and outward from a point of origin, creating two sloping sides that resemble the letter "V". In contrast, a U-shaped pattern tends to have more rounded edges and less defined lines due to a broader area of fire spread, which can occur in situations where the fire affects large sections of fuel or where there is a slower spread, resulting in a more amorphous shape.

The distinction in the sharpness of the lines helps investigators identify the fire's behavior and origin. Understanding these patterns is crucial in fire investigations, as it can lead to insights about the dynamics of the fire and potential ignition sources. This knowledge plays a vital role in reconstructing the sequence of events leading to the fire, aiding in determining the cause and any possible criminal activity.