NASA scientists are building an open global inventory of landslides with the goal of improving predictive models for landslides. The data is crowd-sourced and some are scraped from news sources as well. Anyone can download the data in various formats as well as their open-source predictive model. The model relies on an initial landslide susceptibility analysis and depending on the susceptibility, satelite-based estimates of rainfall are used to issue a moderate- or high-hazard “nowcast”. More info at NASA’s Landslide page.
The National Geodetic Data Center (NGDC) of NOAA has an online collection of photos of various geologic hazards. Many of the photos are from older sets of 35mm slides that have been digitized. They are free to use provided you credit the photographer and the NGDC as the source. The would be really useful for educators and for powerpoint presentations. The only drawback is that they are in TIF format and some of them could use some retouching. (Photo by University of Colorado, made available by NOAA/NGDC)