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#           Landslides after wildfire: Initiation, magnitude, and mobility      

      August 11, 2020    

In the semiarid Southwestern USA, wildfires are commonly followed by runoff-generated debris flows because wildfires remove vegetation and ground cover, which reduces soil infiltration capacity and increases soil erodibility. At a study site in Southern California, we initially observed runoff-generated debris flows in the first year following fire. However, at the same site three years after the fire, the mass-wasting response to a long-duration rainstorm with high rainfall intensity peaks was shallow landsliding rather than runoff-generated debris flows. Moreover, the same storm caused landslides on unburned hillslopes as well as on slopes burned 5 years prior to the storm and areas burned by successive wildfires, 10 years and 3 years before the rainstorm. The landslide density was the highest on the hillslopes that had burned 3 years beforehand, and the hillslopes burned 5 years prior to the storm had low landslide densities, similar to unburned areas. We also found that reburning (i.e., two wildfires within the past 10 years) had little influence on landslide density. Our results indicate that landscape susceptibility to shallow landslides might return to that of unburned conditions after as little as 5 years of vegetation recovery. Moreover, most of the landslide activity was on steep, equatorial-facing slopes that receive higher solar radiation and had slower rates of vegetation regrowth, which further implicates vegetation as a controlling factor on post-fire landslide susceptibility. Finally, the total volume of sediment mobilized by the year 3 landslides was much smaller than the year 1 runoff-generated debris flows, and the landslides were orders of magnitude less mobile than the runoff-generated debris flows.

## Citation Information

## Related Content

                  -              Data           
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August 20, 2020

####                 Inventory of landslides triggered by rainfall on 16-17 January 2019, Los Angeles County, CA              

Landslide Hazards Program

#### Francis Rengers

##### Research Geologist

Landslide Hazards Program

frengers@usgs.gov

303-273-8637

#### Jason Kean

##### Research Hydrologist

Landslide Hazards Program

jwkean@usgs.gov

303-273-8608

#### Dennis Michael Staley

##### Geomorphologist, Physical Geographer

Alaska Volcano Observatory

dstaley@usgs.gov

907-786-7423

## Related Content

August 20, 2020

####                 Inventory of landslides triggered by rainfall on 16-17 January 2019, Los Angeles County, CA              

Landslide Hazards Program

#### Francis Rengers

##### Research Geologist

Landslide Hazards Program

frengers@usgs.gov

303-273-8637

#### Jason Kean

##### Research Hydrologist

Landslide Hazards Program

jwkean@usgs.gov

303-273-8608

#### Dennis Michael Staley

##### Geomorphologist, Physical Geographer

Alaska Volcano Observatory

dstaley@usgs.gov

907-786-7423

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#### Geologic Hazards Science Center

1711 Illinois St.Golden, CO80401United States

303-273-8500

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