Just beyond the creek, the trail entered another burnt strip of land. It looked much like the blackened sections I walked through yesterday. They were the result of the West fire, which started from a lightning strike in late August.
After seeing many burned patches that alternated with unburned land, I became curious about this pattern. I wondered how it happened. Did the terrain’s contours create gaps in the fire? This seemed possible because the trail curved in and out of many folds in the topography. Perhaps the fire jumped ridges as it spread.
On the other hand, I wondered if firefighters intentionally controlled where the fire burned to protect other areas
Later, when I had a chance to research my questions, I learned that yes could be the answer to both.
The alternating pattern of burned and unburned strips of land is called a burn mosaic. Often, the pattern is intentionally created by firefighters to protect wildlife habitats. Unburned areas are called fire refugia, or sometimes fire islands, skips, or shadows.
Using drip torches, drones, and a variety of other tools, firefighters managed the West fire by setting containment lines to control where it burned and where it didn’t.