The source for earthquake and volcano information is from the USGS and recent wildfires from the National Interagency Fire Center. Weather and weather related alerts are sourced from the US National Weather Service. Clicking on icons, points and polygons in the map triggers an informational popup at the cursor location. Clicking on a row in the table will bring up a popup with more detailed information on the clicked item.
Latest version can be demonstrated at https://hgarbeil.github.io/earthevents/.