This choropleth map displays the total number of earthquakes recorded in each U.S. state, using a logarithmic color scale to differentiate seismic activity. State boundaries are drawn as SVG paths via `d3.geoPath` with a `d3.geoAlbersUsa` projection, and each state's fill is determined by a `d3.scaleThreshold` color scale using the `schemeOrRd` palette. The tooltip is implemented with `d3.tip`, though it is not active in the current interaction. The data comes from a CSV file of state earthquake counts and a TopoJSON file of U.S. state boundaries.