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The Dome fire burned 6,684 ha in Bandelier National Monument and the adjacent Sante Fe National Forest in New Mexico. To assess the present stability of the Boundary Peak and Base Camp landslides in Capulin Canyon, and to evaluate the potential for destabilization due to the removal of vegetation during the Dome fire, a program of mapping and soil-moisture monitoring was undertaken. The Boundary Peak landslide covers an area of approximately 2.9 km2, and appears to be approximately 150 m thick, while the Base Camp landslide covers approximately 0.2 km2. The thickness of the Base Camp landslide deposits is not known. The Boundary Peak landslide deposits experienced two areas of high burn intensity which cover a total area of approximately 0.15 km2. The remainder of the deposits were mapped as moderate or low burn intensities. The Base Camp deposits show one area of low burn intensity which covers an area of 0.03 km2. Neither the Boundary Peak nor Base Camp landslide deposits exhibit evidence of recent movement or instability. Both landslide deposits are mantled by the 50,000to 60,000-year-old El Cajete pumice; deposition of the pumice postdates the last movement on the landslides. The entire landslide topography is muted and subdued. No cracks, fissures, or shear zones were observed, and only a few tilted trees, too few and far between to indicate instability of the deposits, were observed. The present-day interaction of Capulin Creek and the landslide toes appear to be negligible, and no danger of destabilization of the deposits by undercutting appears to exist at this time. The likelihood of reactivation of the Base Camp landslide deposits due to increased infiltration in areas burned by the Dome fire appears to be negligible due to the small area and low intensity of the fire on the deposits. Qualitative evaluation of the preliminary soil-moisture data from the Boundary Peak landslide deposits indicates an apparent change in infiltration characteristics at the burned site, suggesting a slight potential for reactivation of deposits due to the Dome fire. The evaluation indicates that (1) rainfall infiltrates more readily, and to greater depths, at the burned site than at the unburned; and (2) the drying response of the sensors at the burned site is very gradual and over a limited range, while the pore pressures recorded by the shallow probes at the unburned site dissipate much more rapidly and to much higher tension values. These differences may be due to the lack of vegetation-induced transpiration at the burned sites, but continued monitoring is necessary to both confirm these relations and to quantify the differences in infiltration rates. Further evaluation is also necessary to determine if the increased infiltration rates could potentially destabilize the landslide deposits.

Preliminary evaluation of the landslide potential in Capulin Canyon following the Dome fire, Bandelier National Monument, New Mexico