This visualization displays earthquake frequency by magnitude range from 2000 to 2015, using four smoothed lines to represent counts of quakes in the 5-5.9, 6-6.9, 7-7.9, and 8.0+ categories. The chart, built with D3 v5, uses `scaleTime` for the year axis, `scaleLinear` for the count axis, and `line` with `curveBasis` for the smoothed paths. Each magnitude range has a distinct color, with a legend and title included. Data comes from an external CSV file in the Data Canvas Sense Your City dataset.