Gray Earth by mbostock

The Natural Earth Gray Earth raster data set, reprojected to the U.S. National Atlas projection (a rotated Lambert azimuthal equal-area projection) via gdalwarp.

gdalwarp \
  -r lanczos \
  -ts 960 0 \
  -t_srs EPSG:2163 \
  -te -2100000 -2200000 2600000 750000 \
  GRAY_HR_SR_OB_DR.tif \
  shaded-relief.tiff

index.html

<!DOCTYPE html>
<meta charset="utf-8">
<style>

#land {
  fill: none;
  stroke: #000;
  stroke-linejoin: round;
}

</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script>

var width = 960,
    height = 600;

var projection = d3.geo.azimuthalEqualArea()
    .scale(width)
    .translate([33.5, 262.5])
    .rotate([100, -45])
    .center([-17.6076, -4.7913]) // rotated [-122.4183, 37.7750]
    .scale(1297);

var path = d3.geo.path()
    .projection(projection);

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);

d3.json("/mbostock/raw/4090846/us.json", function(error, us) {
  if (error) throw error;

  var defs = svg.append("defs");

  defs.append("path")
      .datum(topojson.feature(us, us.objects.land))
      .attr("id", "land")
      .attr("d", path);

  svg.append("clipPath")
      .attr("id", "clip")
    .append("use")
      .attr("xlink:href", "#land");

  svg.append("image")
      .attr("clip-path", "url(#clip)")
      .attr("xlink:href", "shaded-relief.png")
      .attr("width", width)
      .attr("height", height);

  svg.append("use")
      .attr("xlink:href", "#land");
});

d3.select(self.frameElement).style("height", height + "px");

</script>