Identify whether the map records events or models terrain
The USGS landslide map directory links different products, including inventories, susceptibility information and postfire assessments. An inventory records mapped landslides; a susceptibility model addresses where terrain may be prone to failure. A point and a shaded raster cell are therefore not equivalent evidence. Keep the dataset type beside its legend.
The US landslide inventory and susceptibility tool explains the compilation and limitations of its information. Records originate from different agencies and mapping efforts. A dense group of mapped events can reflect both landslide occurrence and the attention given to documenting that area. A sparse area is not automatically terrain proven free of landslides.
Read scope and scale before zooming to a property
The USGS hazard-map explanation distinguishes the factors and purposes behind landslide mapping. Inspect the original study, resolution and intended use. Zooming a national layer until a house is visible does not improve the underlying evidence to building-level precision. The basemap and hazard layer may have very different levels of detail.
For a California or Pacific Northwest comparison, record whether the selected record is a point location, mapped footprint or model cell. These geometries should not be converted into one another without supporting data. A point at a slide's mapped location is not a precise statement about every part of its runout, and a susceptibility colour is not a predicted date of failure.
Keep postfire products in their stated context
The USGS Landslide Hazards Program includes postfire debris-flow research and assessments. A product for a recently burned area has a different scope from a nationwide inventory of past slides. Preserve the fire or study identity and any rainfall scenario shown. Do not treat a scenario-dependent assessment as a measurement that a debris flow is occurring now.
PocketWorld has no landslide layer or landslide markers. The explorer link opens other disaster layers for related geographic context, not landslide coverage, a US inventory or a property-level susceptibility service. Use the official USGS sources above for landslide mapping. For planning, route decisions and immediate threats, use the responsible local authorities and qualified assessments rather than this explanatory page.
A traceable research note names the product, mapping organization, study period, geometry type and limitations. Link the original dataset and label any forecast or scenario separately. This helps readers understand why a historical point inventory, a terrain model and a current emergency notice can all differ without one of them being a broken map.
Data sources
References are linked beside the explanations above. This evergreen guide does not report current incidents.